WO2008145073A1 - A method, apparatus and tdd system for regulating the transmission power - Google Patents
A method, apparatus and tdd system for regulating the transmission power Download PDFInfo
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- WO2008145073A1 WO2008145073A1 PCT/CN2008/071150 CN2008071150W WO2008145073A1 WO 2008145073 A1 WO2008145073 A1 WO 2008145073A1 CN 2008071150 W CN2008071150 W CN 2008071150W WO 2008145073 A1 WO2008145073 A1 WO 2008145073A1
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- 230000001427 coherent effect Effects 0.000 claims abstract description 24
- 238000010606 normalization Methods 0.000 claims description 15
- 238000004364 calculation method Methods 0.000 claims description 12
- 230000008054 signal transmission Effects 0.000 claims description 7
- 238000013139 quantization Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 8
- 230000006378 damage Effects 0.000 abstract description 2
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- 238000001228 spectrum Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/246—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters where the output power of a terminal is based on a path parameter calculated in said terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR or Eb/lo
Definitions
- the invention relates to the field of carrier communication, in particular to a transmission power control method and a device for time division duplex (TDD) system.
- TDD time division duplex
- Orthogonal Frequency Division Multiplexing is a multi-carrier transmission technology that divides the spectrum into many sub-carriers. Each sub-carrier is modulated at a lower rate, because this technology has good performance. It is resistant to multipath delay and is therefore widely used in cellular mobile systems. Multiple access to OFDM, or 0FDMA, can be achieved by allocating different subcarriers to different users. Each narrowband subcarrier uses different modulation schemes, such as 16QAM, 64QAM, etc., and then uses Inverse Fast Fourier Transforms (IFFT) to provide OFDM modulation. The data to be transmitted is mapped to the symbol of OFDM, and after IFFT, the cyclic prefix is added and sent out. The receiving end uses the Fast Fourier Transforms (FFT) to solve the OFDM symbols, and extracts the data mapped to the symbol.
- FFT Fast Fourier Transforms
- the Wa 1 sh code is an orthogonal spreading code and is commonly used as a spreading code in a spread spectrum system.
- the Wa 1 sh code can eliminate or suppress multiple access interference (Multiple Access Interferences).
- the Walsh code can also be used for the transmission of information sequences. For example, a 10-bit information series can be mapped to a Walsh code of length 1024, and a 1024 Walsh code is used at the receiving end to correlate with the received information series, due to the Walsh code.
- Orthogonality the series of information can be recovered by detecting the largest correlation peak, which is non-coherent detection. Mapping of information sequences belonging to different channels of different users into After the Wa l sh code, different scrambling codes are added to implement multiplexing of the same physical resources by different channels of different users.
- the channels sent by different users on different channels can be regarded as interference processing.
- Resource assignment information reduces the overhead of control information.
- the reverse control channel of the OFDM system In order to improve the communication quality of the system, a similar spread spectrum scheme is proposed in the reverse control channel of the OFDM system.
- the characteristics of the Wahl code are used to transmit the control information.
- the frame length transmitted in each control channel is generally less than or equal to 10 bits (corresponding to 1024 sequences).
- each control channel occupies a subset. Row or column), get a 1024-bit Wahl code, and then scramble the Wahl code.
- the access channel is also treated similarly.
- the WALSH codes scrambled by different uplink control channels are added and combined, and the combined 1024 bits are interleaved and scrambled by another scrambling code to distinguish different cell or sector.
- the output 1024 bits are divided into 8 sub-blocks, each block contains 128 bits, and 128-point FFT (FAST FOURIER TRANSFORMATION) is output for each block. 128 complex values are obtained, and the resulting 1024 complex values are carried in the 0FDM system. Continuous 128 subcarriers and 8 symbols.
- a reverse control block occupies a bandwidth of 1.25 MHz and the length of one physical frame. This system superimposes different user data of different channels on the same physical resource, and does not need resource assignment information when the system performance is satisfied.
- the receiving algorithm is non-coherent reception.
- FDD frequency division duplex mode
- the channel of the block is a coherent channel.
- the channel gain of each time-frequency block on the control block channel is the same. Therefore, the transmit power on each time-frequency block is exactly the same at the time of transmission.
- the channel gain of the entire control segment is not a uniform value, and there is always a difference between each time-frequency block, especially in fast fading channels, so this assumption is relatively rough. of. Therefore, when transmitting control information and transmitting according to this assumption, orthogonality between different Wa s codes cannot be guaranteed. In the synchronous system, the orthogonality of the Wahl code can be fully guaranteed only when the channels are completely consistent. If the channel changes, the orthogonality is destroyed, which increases the probability of error. A waste of information. Summary of the invention
- the purpose of the embodiments of the present invention is to provide a method for adjusting the transmit power and a device for timely splitting and duplexing according to the defect that the performance of the non-coherent detection is poor when transmitting the control information in the FDD mode, and the uplink and downlink channels can be according to the TDD mode. Symmetrical characteristics adjust the uplink transmit power to achieve good non-coherent detection performance.
- an embodiment of the present invention provides a method for adjusting a transmission power, including the following steps:
- an embodiment of the present invention further provides a transmit power adjustment apparatus, including:
- a channel gain obtaining module configured to obtain a channel gain value of each time-frequency block signal according to the downlink pilot signal
- a transmit power adjustment module configured to be connected to the channel gain obtaining module, configured to adjust an original transmit power of each time-frequency block signal according to the channel gain value, to obtain an actual transmit power of each time-frequency block signal.
- An embodiment of the present invention further provides a time division duplex system, including at least one transmit power adjustment device, where the transmit power adjustment device is configured to obtain a channel gain value of each time-frequency block signal according to the downlink pilot signal, according to the The channel gain value adjusts the original transmit power of the respective time-frequency block signals to obtain the actual transmit power of the respective time-frequency block signals.
- the embodiment of the present invention utilizes the symmetry of the uplink and downlink channels of the TDD device, obtains the channel gain value according to the downlink pilot signal, and adjusts the original transmit power of each time-frequency block signal, thereby reducing the time-varying channel pair.
- the destruction of the orthogonality of the uplink control channel improves the non-coherent detection performance of the uplink channel.
- FIG. 1 is a schematic flow chart of a first embodiment of a method for adjusting transmit power according to the present invention
- FIG. 2 is a schematic flow chart of a second embodiment of a method for adjusting transmit power according to the present invention
- FIG. 3 is a schematic flow chart of a third embodiment of a method for adjusting a transmit power according to the present invention.
- FIG. 4 is a schematic structural view of a first embodiment of a transmission power adjusting device according to the present invention.
- FIG. 5 is a schematic structural diagram of a second embodiment of a transmission power adjusting apparatus according to the present invention.
- FIG. 6 is a schematic structural diagram of a third embodiment of a transmission power adjusting device according to the present invention.
- FIG. 7 is a schematic structural view of a fourth embodiment of a transmission power adjusting apparatus according to the present invention. detailed description
- the channel gain is obtained by using the symmetry of the uplink and downlink channels in the TDD mode before the signal is transmitted, and then the transmit power is adjusted, thereby improving the non-coherent detection performance of the uplink channel.
- FIG. 1 is a schematic flowchart diagram of a first embodiment of a method for adjusting a transmission power according to the present invention. This embodiment includes the following steps:
- Step 1 01 Obtain, according to the downlink pilot signal received by the terminal, a channel gain value of each time-frequency block signal, where a channel gain value of the time-frequency block signal is a channel gain value of the sub-carrier;
- Step 1 02 Adjust an original transmit power of each time-frequency block signal according to the channel gain value before performing uplink transmission, to obtain an actual transmit power of each of the sub-carrier signals.
- This embodiment is applicable to a mobile communication system adopting a TDD mode, in which different time slots on the same frequency channel (ie, carrier) are received and transmitted to ensure time to separate the receiving and transmitting channels, thereby making full use of the wireless spectrum. . Since the same frequency channel is used, it can be used for downlink reception. To estimate the channel gain. The original transmit power is adjusted by using the channel gain, and the adjusted actual transmit power is obtained, and then the signal is transmitted, thereby improving the transmission performance of the uplink control channel.
- a TDD mode in which different time slots on the same frequency channel (ie, carrier) are received and transmitted to ensure time to separate the receiving and transmitting channels, thereby making full use of the wireless spectrum.
- interpolation including linear interpolation or nonlinear interpolation
- the channel gain of the embodiment includes amplitude and phase, and the original transmit power of each time-frequency block signal is represented by Sij, where the signal of Sij is used as the interleaved scrambled signal, which may be randomized
- the signal in the channel, or the control channel such as the reverse ACK channel, the CQI channel in the C-A control block, the BFCH channel, the VCQI channel, the MCQI channel, and the SFCH channel, may also be any other channel using non-coherent detection.
- the original transmit power of each time-frequency block signal can be divided by the channel gain to obtain the actual transmit power of each new time-frequency block signal, that is, the following formula:
- the maximum value or threshold may be directly taken as follows:
- sign ( ) is a symbolic function.
- the range of values of the subscripts i and j varies according to the channel. For example, each 2*8 reverse ACK control block in the reverse ACK channel is selected after the DFT sequence is selected and scrambled, but is adjusted by the above method.
- the amplitude of Sij is constant, and the phase change is also small, and the phase and amplitude of H vary greatly. Therefore, in order to binize the type of the transmitted signal, quantization can also be performed, for example, the phase is quantized into 4 Levels, 1/4, 3 1/4, 5 1/4, and 7 1/4, respectively, quantify the amplitude as Dry grades, and so on. This approach can also partially mitigate the effects of degeneration on the downlink to uplink channel.
- the adjustment process is to directly divide the transmission power by the channel gain value.
- the quantization is a number of levels, and the division of the channel gain values of the predetermined phases can be achieved by the existing phase retarder. This quantization method takes into account both the time-varying channel gain value and the hardware implementation cost.
- the method further includes quantizing the channel gain to a preset phase and
- FIG. 2 it is a schematic flowchart of the second embodiment of the method for adjusting the transmit power of the present invention. It can be seen from the previous embodiment that the adjusted total transmit power may exceed the transmit power before the adjustment. In order to maintain the consistency of the power before and after, and does not affect the overall power control, it is also possible to perform normalization adjustment based on the total transmit power before and after the adjustment.
- the embodiment further includes step 103, that is, calculating the total transmit power and the actual transmit power of each time-frequency block signal respectively.
- the original transmit power and the total actual transmit power and determine whether the total actual transmit power is greater than the total original transmit power, if yes, perform step 104; otherwise, use the obtained actual transmit power for signal transmission; Step 1 04 for the actual time-frequency block
- the transmit power performs a normalization operation.
- the total original transmit power is expressed by ⁇
- the total actual transmit power is expressed by ⁇
- the normalization condition may be further limited, that is, if the ratio of the total actual transmit power to the total original transmit power is less than a preset threshold, the actual transmit power may be directly used for signal transmission, otherwise the normalization operation is performed. For example, if the total actual transmit power is increased by 5% or less relative to the total original transmit power, normalization is not required, and when it exceeds 5%, normalization is performed to ensure the consistency of the total transmit power before and after the adjustment.
- step 100 determines whether the channel transmitted by the signal satisfies the coherent condition. If the coherent condition is met, the adjustment operation in the first embodiment is performed. If not, the direct transmission may be performed in the existing manner.
- the terminal capability For how to determine whether the channel transmitted by the signal satisfies the coherent condition, it can be selected according to the terminal capability. If the terminal supports the speed measurement function, it can determine whether the speed of the terminal exceeds the speed threshold, and if it exceeds, it determines that the coherent condition is not satisfied. If the terminal does not support the speed measurement, it may be determined whether the amplitude of the channel gain value of each time-frequency block signal exceeds the amplitude threshold, that is, when the multiple difference between the maximum value and the minimum value of the channel gain is greater than the amplitude threshold, it is determined that the correlation is not satisfied. And determining whether the number of consecutive changes in the sign of the real or imaginary part of the channel gain value of each time-frequency block signal exceeds the number of times threshold, and if so, determining that the coherent condition is not satisfied.
- Step 100 in this embodiment can also be applied to the second embodiment described above.
- FIG. 4 it is a schematic structural diagram of a first embodiment of a transmit power adjustment apparatus according to the present invention, including a channel gain obtaining module 1 and a transmit power adjustment module 2, and the channel gain obtaining module 1 can obtain each time frequency according to a downlink pilot signal.
- Block channel gain value; transmit power adjustment module 2 and letter The channel gain obtaining module 1 is connected to adjust the original transmit power of the respective time-frequency block signals according to the channel gain value to obtain actual transmit power of the respective time-frequency block signals.
- the transmit power adjustment module 2 further includes a calculation module 21 and a transmit power determination module 22, wherein the calculation module 21 is connected to the channel gain obtaining module 1.
- the original transmit power of each time-frequency block signal can be divided by the channel gain to obtain the actual transmit power of each new time-frequency block signal.
- the transmit power determining module 22 is configured to determine whether the actual transmit power of each time-frequency block signal meets a preset range. If the actual transmit power of the time-frequency block signal is not within the preset range, set a predetermined transmit power value as the time-frequency block signal. Actual transmit power.
- the transmit power adjustment module in this embodiment further includes: a total original power calculation module 23, The actual transmit power module 24 and the normalization module 25.
- the total original power calculation module 23 is connected to the calculation module 21 for calculating the total original transmission power according to the original transmission power of each time-frequency block signal.
- the total actual transmit power module 24 is coupled to the calculation module 21 for calculating the total actual transmit power based on the actual transmit power of each time-frequency block signal.
- the normalization module 25 is connected to the total original power calculation module 23 and the total actual transmit power module 24, and after obtaining the actual transmit power of each time-frequency block signal, if the total actual transmit power is greater than the total original transmit power, the time will be The actual transmit power of the frequency block is normalized.
- FIG. 7 is a schematic structural diagram of a fourth embodiment of a transmit power adjustment apparatus according to the present invention.
- the embodiment further includes a coherent condition determination module 3, a channel gain obtaining module 1 and a transmission.
- the power adjustment module 2 is connected to determine whether the channel for signal transmission satisfies the coherent condition, and then performs an adjustment operation; otherwise, the original transmission power is directly used for signal transmission.
- the transmission power adjustment system embodiment of the present invention includes at least one transmission power adjustment device, and the transmission power adjustment device is configured to obtain channel gain values of respective time-frequency block signals according to the downlink pilot signals, and the respective The original transmit power of the time-frequency block signal is adjusted to obtain the actual transmit power of the respective time-frequency block signals.
- the transmit power adjustment module may include a channel gain obtaining module and a transmit power adjustment module, where the channel gain obtaining module is configured to obtain a channel gain value of each time-frequency block signal according to the downlink pilot signal; and a transmit power adjustment module is configured to use the channel gain The value adjusts the original transmit power of each time-frequency block signal to obtain the actual transmit power of the respective time-frequency block signals, which is connected to the channel gain obtaining module.
- the respective transmit power adjustment means given in the above embodiment of the apparatus can also be used in the embodiment of the present system.
- the present invention utilizes the symmetry of the uplink and downlink channels of the TDD device, obtains the channel gain value according to the downlink pilot signal, and obtains the original transmit power of each subcarrier signal.
- the adjustment is performed to reduce the disruption of the orthogonality of the uplink control channel by the time-varying channel, and the non-coherent detection performance of the uplink channel is improved.
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Abstract
This invention discloses a method for regulating the transmission power which includes the following steps: receiving downlink pilot signal and acquiring the channel gain value of each time-frequency block signal; according to said channel gain value, regulating the primary transmission power of each time-frequency block signal and acquiring the actual transmission power of each time-frequency block signal. This invention also discloses an apparatus for regulating the transmission power which includes a channel gain acquiring module and a transmission power regulating module. Furthermore, this invention discloses a TDD system which includes at least one said apparatus for regulating the transmission power. The embodiments of this invention acquires the channel gain value according to downlink pilot signal by using the symmetry of the uplink and downlink of TDD system, and regulates the primary transmission power of each sub-carrier signal so as to reduce the damage to the orthogonality of uplink control channel from the time-varying channel and improve the performance of non-coherent detection in uplink channel.
Description
发射功率调整方法、 装置及时分双工系统 Transmitting power adjustment method, device timely division duplex system
技术领域 Technical field
本发明涉及载波通信领域, 尤其是一种发射功率控制方法、 装置及时分 双工 (Time Division Duplex, 筒称 TDD) 系统。 背景技术 The invention relates to the field of carrier communication, in particular to a transmission power control method and a device for time division duplex (TDD) system. Background technique
正交频分复用 (Orthogonal Frequency Division Multiplexing, 筒称 OFDM)是一种多载波传输技术, 可以将频谱分成许多子载波, 每个子载波采用 较低速率进行调制, 由于这种技术具有很好的抗多径时延能力,因而在蜂窝移 动系统中得到广泛应用。通过向不同的用户分配不同的子载波,可以实现 OFDM 的多址接入, 即 0FDMA。 每个窄带子载波采用不同的调制方式, 例如 16QAM、 64QAM等等,然后采用逆快速傅立叶变换 ( Inverse Fast Fourier Transforms, 筒称 IFFT)来提供 OFDM调制。 需要传输的数据被映射到 OFDM的符号上, 经 过 IFFT后, 加上循环前缀, 发送出去。 接收端利用快速傅里叶变换(Fast Fourier Transforms, 筒称 FFT )解出 OFDM符号, 取出映射到该符号的数据。 Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier transmission technology that divides the spectrum into many sub-carriers. Each sub-carrier is modulated at a lower rate, because this technology has good performance. It is resistant to multipath delay and is therefore widely used in cellular mobile systems. Multiple access to OFDM, or 0FDMA, can be achieved by allocating different subcarriers to different users. Each narrowband subcarrier uses different modulation schemes, such as 16QAM, 64QAM, etc., and then uses Inverse Fast Fourier Transforms (IFFT) to provide OFDM modulation. The data to be transmitted is mapped to the symbol of OFDM, and after IFFT, the cyclic prefix is added and sent out. The receiving end uses the Fast Fourier Transforms (FFT) to solve the OFDM symbols, and extracts the data mapped to the symbol.
在 0FDMA系统中, 对不同用户指配不同的资源(时间、 空间、 频率资源) 来实现不同用户对资源的共享, 同时系统必需指示每一个终端其数据将在哪 些资源上传送。 当用户数增加时, 用于传送资源指配信息的开销将增大。 对 于反向控制信道, 每个信道传送的信令较短, 系统可分配的资源数有限, 同 时不同用户不同信道间的数据无法通过编码来提高传输性能。 In the 0FDMA system, different users are assigned different resources (time, space, frequency resources) to realize sharing of resources by different users, and the system must indicate on which resources each terminal will transmit data. As the number of users increases, the overhead for transmitting resource assignment information will increase. For the reverse control channel, the signaling transmitted by each channel is short, and the number of resources that can be allocated by the system is limited. At the same time, data between different channels of different users cannot be encoded to improve transmission performance.
Wa 1 sh码是一种正交扩频码,通常用于扩频系统中作为扩频码使用。 Wa 1 sh 码可以消除或抑制多址干扰(Multiple Access Interferences, 筒称 MAI)。 同时, Walsh码也可用于信息序列的传送, 例如, 10比特信息系列可以映射 成长度为 1024的 Walsh码, 在接收端用 1024个 Wal sh码与接收到的信息系 列做相关, 由于 Walsh码的正交性, 通过检测最大的相关峰可以恢复出信息 系列, 这种方式为非相干检测。 属于不同用户不同信道的信息序列映射成
Wa l sh码后, 加入不同的扰码来实现不同用户不同信道对相同物理资源的复 用。 此时不同信道不同用户发送的信道可看作是干扰来处理, 在保证控制信 道性能的条件下, 在固定资源 (或可变资源, 但终端可以根据其变化规律知 道其位置)上传送信息无需资源指配信息, 降低了控制信息的开销。 The Wa 1 sh code is an orthogonal spreading code and is commonly used as a spreading code in a spread spectrum system. The Wa 1 sh code can eliminate or suppress multiple access interference (Multiple Access Interferences). At the same time, the Walsh code can also be used for the transmission of information sequences. For example, a 10-bit information series can be mapped to a Walsh code of length 1024, and a 1024 Walsh code is used at the receiving end to correlate with the received information series, due to the Walsh code. Orthogonality, the series of information can be recovered by detecting the largest correlation peak, which is non-coherent detection. Mapping of information sequences belonging to different channels of different users into After the Wa l sh code, different scrambling codes are added to implement multiplexing of the same physical resources by different channels of different users. At this time, the channels sent by different users on different channels can be regarded as interference processing. Under the condition of ensuring the performance of the control channel, it is not necessary to transmit information on a fixed resource (or a variable resource, but the terminal can know its location according to its changing law). Resource assignment information reduces the overhead of control information.
在 UMB1. 0标准中, 为了提高系统的通信质量, 在 OFDM系统反向控制信 道中提出了一种类似扩频的方案,在 OFDM系统中利用 Wa l sh码的特性来传送 控制信息。 除了接入序列, 每个控制信道中传送的帧长一般小于等于 10比特 (对应 1024个序列), 为了充分利用 Wa l sh码的资源同时尽量减少干扰, 把 1024个序列分成若干个子集,除了接入信道外,每个控制信道占用一个子集。 行或一列), 得到一个 1024比特长的 Wa l sh码, 再对该 Wa l sh码进行加扰。 接入信道也作类似的处理。 对不同上行控制信道加扰后的 WALSH码进行相加 合并, 合并后的 1024比特再进行交织, 并用另一个扰码加扰以区别不同的蜂 窝小区或扇区。 输出的 1024比特被分成 8个子块, 每块含 128个比特, 对每 个块进行 128点的 FFT (FAST FOURIER TRANSFORMATION)输出 128个复数值, 最后得到的 1024个复数值被携带在 0FDM系统中连续的 128个子载波和 8个 符号上。 这样, 一个反向控制块占用了 1. 25MHz的带宽和一个物理帧的长度。 此系统将不同信道不同用户数据在相同的物理资源上进行叠加, 在满足系统 性能的情况下无需资源指配信 , 。 In the UMB1.0 standard, in order to improve the communication quality of the system, a similar spread spectrum scheme is proposed in the reverse control channel of the OFDM system. In the OFDM system, the characteristics of the Wahl code are used to transmit the control information. In addition to the access sequence, the frame length transmitted in each control channel is generally less than or equal to 10 bits (corresponding to 1024 sequences). In order to make full use of the resources of the WaSh code while minimizing interference, divide the 1024 sequences into several subsets, except Outside the access channel, each control channel occupies a subset. Row or column), get a 1024-bit Wahl code, and then scramble the Wahl code. The access channel is also treated similarly. The WALSH codes scrambled by different uplink control channels are added and combined, and the combined 1024 bits are interleaved and scrambled by another scrambling code to distinguish different cell or sector. The output 1024 bits are divided into 8 sub-blocks, each block contains 128 bits, and 128-point FFT (FAST FOURIER TRANSFORMATION) is output for each block. 128 complex values are obtained, and the resulting 1024 complex values are carried in the 0FDM system. Continuous 128 subcarriers and 8 symbols. Thus, a reverse control block occupies a bandwidth of 1.25 MHz and the length of one physical frame. This system superimposes different user data of different channels on the same physical resource, and does not need resource assignment information when the system performance is satisfied.
在这种方案中,接收算法为非相干接收。在采用频分双工模式( Frequency Divi s ion Dupl exing , 筒称 FDD ) 时, 由于没有上行信道的信道信息, 所以 在终端发送时隐含有这样一个假设, 即整个反向控制信道所在的控制块的信 道为一个相干信道, 筒言之, 控制块信道上每个时频块的信道增益都一样。 因此, 发射的时候每个时频块上的发射功率也是完全一致的。 In this scheme, the receiving algorithm is non-coherent reception. In the frequency division duplex mode (FDD), since there is no channel information of the uplink channel, there is an implicit assumption in the terminal transmission, that is, the control of the entire reverse control channel. The channel of the block is a coherent channel. In other words, the channel gain of each time-frequency block on the control block channel is the same. Therefore, the transmit power on each time-frequency block is exactly the same at the time of transmission.
但是, 事实上在接收端, 整个控制段的信道增益并非是一个统一的值, 各个时频块之间总是有差异, 尤其在快衰落信道, 所以这种假设是比较粗略
的。因此在发送控制信息的时候,依照这种假设去发送,则无法保证不同 Wa l sh 码之间的正交性。 由于在同步系统中, 只有在信道完全保持一致的情况下, Wa l sh码的正交性才能得到充分的保证, 如果信道有变化, 那么正交性就被 破坏, 就增加了出错概率, 从而造成信息的浪费。 发明内容 However, in fact, at the receiving end, the channel gain of the entire control segment is not a uniform value, and there is always a difference between each time-frequency block, especially in fast fading channels, so this assumption is relatively rough. of. Therefore, when transmitting control information and transmitting according to this assumption, orthogonality between different Wa s codes cannot be guaranteed. In the synchronous system, the orthogonality of the Wahl code can be fully guaranteed only when the channels are completely consistent. If the channel changes, the orthogonality is destroyed, which increases the probability of error. A waste of information. Summary of the invention
本发明实施例的目的是针对于以 FDD模式发送控制信息时非相干检测的 性能较差的缺陷, 提出了一种发射功率调整方法、 装置及时分双工系统, 能 够根据 TDD模式下上下行信道对称的特点调整上行的发射功率, 获得良好的 非相干检测性能。 The purpose of the embodiments of the present invention is to provide a method for adjusting the transmit power and a device for timely splitting and duplexing according to the defect that the performance of the non-coherent detection is poor when transmitting the control information in the FDD mode, and the uplink and downlink channels can be according to the TDD mode. Symmetrical characteristics adjust the uplink transmit power to achieve good non-coherent detection performance.
为实现上述目的, 本发明的实施例提供了一种发射功率调整方法, 包括 以下步骤: To achieve the above objective, an embodiment of the present invention provides a method for adjusting a transmission power, including the following steps:
接收下行导频信号, 获得各个时频块信号的信道增益值; Receiving a downlink pilot signal, and obtaining a channel gain value of each time-frequency block signal;
根据所述信道增益值对所述各个时频块信号的原始发射功率进行调 整, 获得所述各个时频块信号的实际发射功率。 And adjusting an original transmit power of each of the time-frequency block signals according to the channel gain value to obtain an actual transmit power of the respective time-frequency block signals.
为了实现上述目的, 本发明的实施例还提供了一种发射功率调整装置, 包括: In order to achieve the above object, an embodiment of the present invention further provides a transmit power adjustment apparatus, including:
信道增益获得模块, 用于根据下行导频信号获得各个时频块信号的信 道增益值; a channel gain obtaining module, configured to obtain a channel gain value of each time-frequency block signal according to the downlink pilot signal;
发射功率调整模块, 与所述信道增益获得模块相连, 用于根据所述信 道增益值对所述各个时频块信号的原始发射功率进行调整, 获得所述各个 时频块信号的实际发射功率。 And a transmit power adjustment module, configured to be connected to the channel gain obtaining module, configured to adjust an original transmit power of each time-frequency block signal according to the channel gain value, to obtain an actual transmit power of each time-frequency block signal.
本发明的实施例还提供了一种时分双工系统, 包括至少一个发射功率调 整装置, 所述发射功率调整装置用于根据下行导频信号获得各个时频块信号 的信道增益值, 根据所述信道增益值对所述各个时频块信号的原始发射功率 进行调整, 获得所述各个时频块信号的实际发射功率。
基于上述技术方案,本发明的实施例利用 TDD装置上下行信道的对称性, 根据下行导频信号获得信道增益值, 并对各个时频块信号的原始发射功率进 行调整, 减少了时变信道对上行控制信道正交性的破坏, 提高了上行信道的 非相干检测性能。 附图说明 An embodiment of the present invention further provides a time division duplex system, including at least one transmit power adjustment device, where the transmit power adjustment device is configured to obtain a channel gain value of each time-frequency block signal according to the downlink pilot signal, according to the The channel gain value adjusts the original transmit power of the respective time-frequency block signals to obtain the actual transmit power of the respective time-frequency block signals. Based on the foregoing technical solution, the embodiment of the present invention utilizes the symmetry of the uplink and downlink channels of the TDD device, obtains the channel gain value according to the downlink pilot signal, and adjusts the original transmit power of each time-frequency block signal, thereby reducing the time-varying channel pair. The destruction of the orthogonality of the uplink control channel improves the non-coherent detection performance of the uplink channel. DRAWINGS
图 1为本发明发射功率调整方法的第一实施例的流程示意图; 1 is a schematic flow chart of a first embodiment of a method for adjusting transmit power according to the present invention;
图 2为本发明发射功率调整方法的第二实施例的流程示意图; 2 is a schematic flow chart of a second embodiment of a method for adjusting transmit power according to the present invention;
图 3为本发明发射功率调整方法的第三实施例的流程示意图; 3 is a schematic flow chart of a third embodiment of a method for adjusting a transmit power according to the present invention;
图 4为本发明发射功率调整装置的第一实施例的结构示意图; 4 is a schematic structural view of a first embodiment of a transmission power adjusting device according to the present invention;
图 5为本发明发射功率调整装置的第二实施例的结构示意图; FIG. 5 is a schematic structural diagram of a second embodiment of a transmission power adjusting apparatus according to the present invention; FIG.
图 6为本发明发射功率调整装置的第三实施例的结构示意图; 6 is a schematic structural diagram of a third embodiment of a transmission power adjusting device according to the present invention;
图 7为本发明发射功率调整装置的第四实施例的结构示意图。 具体实施方式 FIG. 7 is a schematic structural view of a fourth embodiment of a transmission power adjusting apparatus according to the present invention. detailed description
本发明实施例在进行信号发射前利用 TDD模式下上下行信道的对称性获得 信道增益, 进而调整发射功率, 从而实现上行信道的非相干检测性能的提高。 In the embodiment of the present invention, the channel gain is obtained by using the symmetry of the uplink and downlink channels in the TDD mode before the signal is transmitted, and then the transmit power is adjusted, thereby improving the non-coherent detection performance of the uplink channel.
如图 1所示, 为本发明发射功率调整方法的第一实施例的流程示意图。 本实施例包括以下步骤: FIG. 1 is a schematic flowchart diagram of a first embodiment of a method for adjusting a transmission power according to the present invention. This embodiment includes the following steps:
步骤 1 01、 根据终端接收到的下行导频信号获得各个时频块信号的信 道增益值, 该时频块信号的信道增益值为子载波的信道增益值; Step 1 01: Obtain, according to the downlink pilot signal received by the terminal, a channel gain value of each time-frequency block signal, where a channel gain value of the time-frequency block signal is a channel gain value of the sub-carrier;
步骤 1 02、在进行上行发射之前根据所述信道增益值对所述各个时频块 信号的原始发射功率进行调整, 获得所述各个子载波信号的实际发射功率。 Step 1 02: Adjust an original transmit power of each time-frequency block signal according to the channel gain value before performing uplink transmission, to obtain an actual transmit power of each of the sub-carrier signals.
本实施例适用于采用 TDD模式的移动通信系统, 在这种模式下接收和传 送在同一频率信道(即载波)的不同时隙,以保证时间来分离接收和传送信道, 因此可充分利用无线频谱。 由于采用同一频率信道, 因此在下行接收时便可
以估计出信道增益。 利用信道增益对原始发射功率进行调整, 得到调整后的 实际发射功率再进行信号发射, 从而改善上行控制信道的传输性能。 This embodiment is applicable to a mobile communication system adopting a TDD mode, in which different time slots on the same frequency channel (ie, carrier) are received and transmitted to ensure time to separate the receiving and transmitting channels, thereby making full use of the wireless spectrum. . Since the same frequency channel is used, it can be used for downlink reception. To estimate the channel gain. The original transmit power is adjusted by using the channel gain, and the adjusted actual transmit power is obtained, and then the signal is transmitted, thereby improving the transmission performance of the uplink control channel.
获得信道增益值的方法有很多, 比如由于导频信号 Pilot是已知的, 所 以可以采用接收到的信号 Received除以导频信号,以得到导频信号位置的信 道增益, 即 H=Received/Pilot, 然后在相邻的时域或者频域利用插值(包括 线性插值或者非线性插值)得到各个时频信号块的信道增益。 There are many ways to obtain the channel gain value. For example, since the pilot signal Pilot is known, the received signal Received can be divided by the pilot signal to obtain the channel gain of the pilot signal position, that is, H=Received/Pilot. Then, the channel gain of each time-frequency signal block is obtained by interpolation (including linear interpolation or nonlinear interpolation) in the adjacent time domain or frequency domain.
这里用 表示信道增益, i表示发射信号所占资源块的子载波的序号, j 表示发射信号所占资源块的符号的序号, i=l,2, ..., 8; j=l,2, ..., 128, 本实 施例的信道增益中包括了幅度和相位, 各个时频块信号的原始发射功率用 Sij表 示, 这里采用 Sij的信号为交织加扰后的信号, 可以是随机接入信道中的信号, 或者是反向 ACK信道、 C丽 A控制块中的 CQI信道、 BFCH信道、 VCQI信道、 MCQI信 道、 SFCH信道等控制信道, 也可以是其他采用非相干检测的任意信道。 Here, the channel gain is used, i is the number of the subcarrier of the resource block occupied by the transmitted signal, and j is the number of the symbol of the resource block occupied by the transmitted signal, i=l, 2, ..., 8; j=l, 2 , ..., 128, the channel gain of the embodiment includes amplitude and phase, and the original transmit power of each time-frequency block signal is represented by Sij, where the signal of Sij is used as the interleaved scrambled signal, which may be randomized The signal in the channel, or the control channel such as the reverse ACK channel, the CQI channel in the C-A control block, the BFCH channel, the VCQI channel, the MCQI channel, and the SFCH channel, may also be any other channel using non-coherent detection.
在进行功率调整时, 可以将各个时频块信号的原始发射功率除以信道 增益, 获得新的各个时频块信号的实际发射功率 即以下公式: When power adjustment is performed, the original transmit power of each time-frequency block signal can be divided by the channel gain to obtain the actual transmit power of each new time-frequency block signal, that is, the following formula:
T^S H^ i=l, 2, 8; j=l, 2, ..., 128 T^S H^ i=l, 2, 8; j=l, 2, ..., 128
如果某一个时频块上调整后的信号功率超过功率放大器的最大范围或者 某一个阈值时, 可以直接取该最大值或者阈值, 如下:
If the adjusted signal power on a time-frequency block exceeds the maximum range of the power amplifier or a certain threshold, the maximum value or threshold may be directly taken as follows:
这里的 sign ( ) 为符号函数。 根据信道的不同, 下标 i、 j 的取值范围 也有所不同, 例如反向 ACK信道中每个 2*8的反向 ACK控制块在选定 DFT序 列并加扰后, 但采用上述方法调整时, 下标 i和 j的取值与上述例子不同, 其中 i=l或 2, j=l, 2, 8。 Here sign ( ) is a symbolic function. The range of values of the subscripts i and j varies according to the channel. For example, each 2*8 reverse ACK control block in the reverse ACK channel is selected after the DFT sequence is selected and scrambled, but is adjusted by the above method. The values of the subscripts i and j are different from the above examples, where i = 1 or 2, j = 1, 2, 8.
本实施例中 Sij的幅度是一定的, 而且相位变化也较少, 而 H的相位和幅度 的变化较大, 因此为了筒化发射信号的种类, 也可以对 进行量化, 比如把 相位量化成 4个等级, 分别为 1/4,3 1/4,5 1/4和 7 1/4, 把幅度量化成若
干个等级, 等等。 这种方式也可以部分地减轻下行到上行的信道时变性带来 的影响。 In this embodiment, the amplitude of Sij is constant, and the phase change is also small, and the phase and amplitude of H vary greatly. Therefore, in order to binize the type of the transmitted signal, quantization can also be performed, for example, the phase is quantized into 4 Levels, 1/4, 3 1/4, 5 1/4, and 7 1/4, respectively, quantify the amplitude as Dry grades, and so on. This approach can also partially mitigate the effects of degeneration on the downlink to uplink channel.
在本实施例中调整处理是将发射功率直接除以信道增益值, 这种方式 虽然理论上比较清晰, 但在实际应用中由于信道增益值的时变性, 对硬件 配置要求会比较高。 因此为了降低对硬件的要求, 可以对信道增益值进行 量化, 例如将相位量化为 4个等级, 分别为 ^、 ^、 和^ , 将幅度也 In this embodiment, the adjustment process is to directly divide the transmission power by the channel gain value. Although this method is theoretically clear, in practical applications, due to the time variation of the channel gain value, the hardware configuration requirements are relatively high. Therefore, in order to reduce the hardware requirements, the channel gain value can be quantized, for example, the phase is quantized into four levels, namely ^, ^, and ^, respectively.
4 4 4 4 4 4 4 4
量化为若干个等级, 通过现有的相位延迟器, 就可以实现这几种预定的相 位的信道增益值的除法。 这种量化方式同时兼顾了信道增益值的时变' ί生和 硬件实现代价。 The quantization is a number of levels, and the division of the channel gain values of the predetermined phases can be achieved by the existing phase retarder. This quantization method takes into account both the time-varying channel gain value and the hardware implementation cost.
在除以所述信道增益之前, 还包括将所述信道增益量化为预设相位和 Before dividing the channel gain, the method further includes quantizing the channel gain to a preset phase and
/或幅度的数值的步骤。 / or the step of the magnitude of the value.
如图 2所示, 为本发明发射功率调整方法的第二实施例的流程示意图, 从上个实施例中可以看出, 调整后的总发射功率有一定的可能会超过调整前 的发射功率, 为了保持前后功率的一致性, 而且不影响整体的功率控制, 因 此还可以根据调整前后的总发射功率来进行归一化调整。 As shown in FIG. 2, it is a schematic flowchart of the second embodiment of the method for adjusting the transmit power of the present invention. It can be seen from the previous embodiment that the adjusted total transmit power may exceed the transmit power before the adjustment. In order to maintain the consistency of the power before and after, and does not affect the overall power control, it is also possible to perform normalization adjustment based on the total transmit power before and after the adjustment.
与上一实施例不同的是,本实施例在获得各个时频块信号的实际发射功 率后, 还包括步骤 1 03 , 即根据各个时频块信号的原始发射功率和实际发 射功率分别计算获得总原始发射功率和总实际发射功率, 并判断总实际发 射功率是否大于总原始发射功率, 是则执行步骤 1 04 , 否则采用获得的实 际发射功率进行信号发射; 步骤 1 04对各个时频块的实际发射功率执行归 一化操作。 Different from the previous embodiment, after obtaining the actual transmit power of each time-frequency block signal, the embodiment further includes step 103, that is, calculating the total transmit power and the actual transmit power of each time-frequency block signal respectively. The original transmit power and the total actual transmit power, and determine whether the total actual transmit power is greater than the total original transmit power, if yes, perform step 104; otherwise, use the obtained actual transmit power for signal transmission; Step 1 04 for the actual time-frequency block The transmit power performs a normalization operation.
总原始发射功率用∑|τ .|2表示, 总实际发射功率用∑| |2表示, 如果 总发射功率变小则不需要进行归一化处理, 但如果总发射功率变大则需要 将各个时频块的实际发射功率统一乘以调整系数 =∑| |2 /∑^|2 , 由于总 实际发射功率较大, 因此 δ < 1。
采用这种归一化操作, 可以限定执行次数, 以取得性能和复杂性的均 衡。 也可以对归一化条件进行进一步的限制, 即总实际发射功率与总原始 发射功率的比值如果小于预设阈值, 则可直接采用所述实际发射功率进行 信号发射, 否则执行归一化操作。 例如总实际发射功率相对于总原始发射 功率增加 5%以下就不需要进行归一化, 而超过 5%则进行归一化, 从而保 证调整前后总发射功率的一致性。 The total original transmit power is expressed by ∑|τ .| 2 , and the total actual transmit power is expressed by ∑| | 2 , if the total transmit power becomes smaller, no normalization is required, but if the total transmit power becomes larger, each need to be The actual transmit power of the time-frequency block is uniformly multiplied by the adjustment factor = ∑ | | 2 /∑^| 2 , since the total actual transmit power is large, δ < 1. With this normalization operation, the number of executions can be limited to achieve a balance of performance and complexity. The normalization condition may be further limited, that is, if the ratio of the total actual transmit power to the total original transmit power is less than a preset threshold, the actual transmit power may be directly used for signal transmission, otherwise the normalization operation is performed. For example, if the total actual transmit power is increased by 5% or less relative to the total original transmit power, normalization is not required, and when it exceeds 5%, normalization is performed to ensure the consistency of the total transmit power before and after the adjustment.
通常此时发射的信道与先前做下行信道估计时候的信道多多少少有些变 化, 如果终端在进行信道估计的时候发现信道变化很快, 例如终端在高速运 动的时候信道的时变性非常强, 同一帧里已经不满足信道相干条件了, 那么 此时再进行预均衡已失去意义。 因此需要对信道相干条件进行判断。 如图 3 所示, 为本发明发射功率调整方法的第三实施例的流程示意图, 与第一实施 例相比, 本实施例在对各个时频块信号的原始发射功率进行调整前, 还增 加了步骤 100 , 步骤 100对信号发射的信道是否满足相干条件进行判断,如 果满足相干条件, 则执行第一实施例中的调整操作, 如果不满足, 则可以 以现有方式直接发射。 Generally, the channel transmitted at this time is somewhat different from the channel when the downlink channel is previously estimated. If the terminal finds that the channel changes rapidly when performing channel estimation, for example, the time variation of the channel is very strong when the terminal is moving at a high speed. If the channel coherence condition is not satisfied in the frame, then pre-equalization has lost its meaning. Therefore, it is necessary to judge the channel coherence conditions. As shown in FIG. 3, it is a schematic flowchart of a third embodiment of a method for adjusting a transmit power according to the present invention. Compared with the first embodiment, the present embodiment increases the original transmit power of each time-frequency block signal before adjusting. In step 100, step 100 determines whether the channel transmitted by the signal satisfies the coherent condition. If the coherent condition is met, the adjustment operation in the first embodiment is performed. If not, the direct transmission may be performed in the existing manner.
对于如何判断信号发射的信道是否满足相干条件, 可以根据终端能力 来选择, 如果终端支持测速功能, 则可以判断终端的速度是否超过速度阈 值, 如果超过, 则确定不满足相干条件。 如果终端不支持测速, 则可以判 断各个时频块信号的信道增益值的变化幅度是否超过幅度阈值, 即信道增 益的最大值和最小值之间的倍数差别大于幅度阈值时, 则确定不满足相干 条件; 或者判断各个时频块信号的信道增益值的实部或虚部的符号连续变 化的次数是否超过次数阈值, 如果超过, 则确定不满足相干条件。 For how to determine whether the channel transmitted by the signal satisfies the coherent condition, it can be selected according to the terminal capability. If the terminal supports the speed measurement function, it can determine whether the speed of the terminal exceeds the speed threshold, and if it exceeds, it determines that the coherent condition is not satisfied. If the terminal does not support the speed measurement, it may be determined whether the amplitude of the channel gain value of each time-frequency block signal exceeds the amplitude threshold, that is, when the multiple difference between the maximum value and the minimum value of the channel gain is greater than the amplitude threshold, it is determined that the correlation is not satisfied. And determining whether the number of consecutive changes in the sign of the real or imaginary part of the channel gain value of each time-frequency block signal exceeds the number of times threshold, and if so, determining that the coherent condition is not satisfied.
本实施例中的步骤 1 00也可以应用在上述第二实施例中。 Step 100 in this embodiment can also be applied to the second embodiment described above.
如图 4所示, 为本发明发射功率调整装置的第一实施例的结构示意图, 包 括信道增益获得模块 1和发射功率调整模块 2,信道增益获得模块 1可以根 据下行导频信号获得各个时频块的信道增益值; 发射功率调整模块 2 与信
道增益获得模块 1 相连, 用于根据所述信道增益值对所述各个时频块信号 的原始发射功率进行调整, 获得所述各个时频块信号的实际发射功率。 As shown in FIG. 4, it is a schematic structural diagram of a first embodiment of a transmit power adjustment apparatus according to the present invention, including a channel gain obtaining module 1 and a transmit power adjustment module 2, and the channel gain obtaining module 1 can obtain each time frequency according to a downlink pilot signal. Block channel gain value; transmit power adjustment module 2 and letter The channel gain obtaining module 1 is connected to adjust the original transmit power of the respective time-frequency block signals according to the channel gain value to obtain actual transmit power of the respective time-frequency block signals.
如图 5所示, 为本发明发射功率调整装置的第二实施例的结构示意图, 发射功率调整模块 2进一步包括计算模块 21、 发射功率判断模块 22 , 其 中计算模块 21与信道增益获得模块 1相连, 可以将各个时频块信号的原 始发射功率除以所述信道增益, 获得新的各个时频块信号的实际发射功 率。 发射功率判断模块 22 用于判断各个时频块信号的实际发射功率是否 符合预设范围, 如果时频块信号的实际发射功率不在预设范围内, 则设置 预定发射功率值作为该时频块信号的实际发射功率。 As shown in FIG. 5, it is a schematic structural diagram of a second embodiment of a transmit power adjustment apparatus according to the present invention. The transmit power adjustment module 2 further includes a calculation module 21 and a transmit power determination module 22, wherein the calculation module 21 is connected to the channel gain obtaining module 1. The original transmit power of each time-frequency block signal can be divided by the channel gain to obtain the actual transmit power of each new time-frequency block signal. The transmit power determining module 22 is configured to determine whether the actual transmit power of each time-frequency block signal meets a preset range. If the actual transmit power of the time-frequency block signal is not within the preset range, set a predetermined transmit power value as the time-frequency block signal. Actual transmit power.
如图 6所示, 为本发明发射功率调整装置的第三实施例的结构示意图, 与上一实施例相比, 本实施例中的发射功率调整模块还包括: 总原始功率 计算模块 23 , 总实际发射功率模块 24和归一化模块 25。 其中总原始功率 计算模块 23 , 与计算模块 21相连, 用于根据各个时频块信号的原始发射 功率计算总原始发射功率。 总实际发射功率模块 24 , 与计算模块 21相连, 用于根据各个时频块信号的实际发射功率计算总实际发射功率。 归一化模 块 25 , 与总原始功率计算模块 23和总实际发射功率模块 24相连, 可以在 获得各个时频块信号的实际发射功率后, 如果总实际发射功率大于总原始 发射功率, 将各个时频块的实际发射功率进行归一化操作。 As shown in FIG. 6 , it is a schematic structural diagram of a third embodiment of a transmit power adjustment apparatus according to the present invention. Compared with the previous embodiment, the transmit power adjustment module in this embodiment further includes: a total original power calculation module 23, The actual transmit power module 24 and the normalization module 25. The total original power calculation module 23 is connected to the calculation module 21 for calculating the total original transmission power according to the original transmission power of each time-frequency block signal. The total actual transmit power module 24 is coupled to the calculation module 21 for calculating the total actual transmit power based on the actual transmit power of each time-frequency block signal. The normalization module 25 is connected to the total original power calculation module 23 and the total actual transmit power module 24, and after obtaining the actual transmit power of each time-frequency block signal, if the total actual transmit power is greater than the total original transmit power, the time will be The actual transmit power of the frequency block is normalized.
如图 7所示, 为本发明发射功率调整装置的第四实施例的结构示意图, 与第一实施例相比, 本实施例还包括有相干条件判断模块 3 , 与信道增益获 得模块 1和发射功率调整模块 2相连, 用于判断信号发射的信道是否满足 相干条件,是则执行调整操作,否则直接采用原始发射功率进行信号发射。 FIG. 7 is a schematic structural diagram of a fourth embodiment of a transmit power adjustment apparatus according to the present invention. Compared with the first embodiment, the embodiment further includes a coherent condition determination module 3, a channel gain obtaining module 1 and a transmission. The power adjustment module 2 is connected to determine whether the channel for signal transmission satisfies the coherent condition, and then performs an adjustment operation; otherwise, the original transmission power is directly used for signal transmission.
本发明发射功率调整系统实施例包括至少一个发射功率调整装置, 所 述发射功率调整装置用于根据下行导频信号获得各个时频块信号的信道 增益值, 根据所述信道增益值对所述各个时频块信号的原始发射功率进行 调整, 获得所述各个时频块信号的实际发射功率。
发射功率调整装置可以包括信道增益获得模块和发射功率调整模块, 其中信道增益获得模块用于根据下行导频信号获得各个时频块信号的信 道增益值; 发射功率调整模块用于根据所述信道增益值对各个时频块信号 的原始发射功率进行调整, 获得所述各个时频块信号的实际发射功率, 其 与信道增益获得模块相连。 对于上述装置实施例中的给出的各个发射功率 调整装置也可以在本系统实施例中使用。 The transmission power adjustment system embodiment of the present invention includes at least one transmission power adjustment device, and the transmission power adjustment device is configured to obtain channel gain values of respective time-frequency block signals according to the downlink pilot signals, and the respective The original transmit power of the time-frequency block signal is adjusted to obtain the actual transmit power of the respective time-frequency block signals. The transmit power adjustment module may include a channel gain obtaining module and a transmit power adjustment module, where the channel gain obtaining module is configured to obtain a channel gain value of each time-frequency block signal according to the downlink pilot signal; and a transmit power adjustment module is configured to use the channel gain The value adjusts the original transmit power of each time-frequency block signal to obtain the actual transmit power of the respective time-frequency block signals, which is connected to the channel gain obtaining module. The respective transmit power adjustment means given in the above embodiment of the apparatus can also be used in the embodiment of the present system.
通过上述发射功率调整的方法、 装置及时分双工系统的实施例, 本发 明利用 TDD装置上下行信道的对称性,根据下行导频信号获得信道增益值, 并对各个子载波信号的原始发射功率进行调整, 减少了时变信道对上行控 制信道正交性的破坏, 提高了上行信道的非相干检测性能。 Through the foregoing method for adjusting the transmit power and the embodiment of the device to divide the duplex system in time, the present invention utilizes the symmetry of the uplink and downlink channels of the TDD device, obtains the channel gain value according to the downlink pilot signal, and obtains the original transmit power of each subcarrier signal. The adjustment is performed to reduce the disruption of the orthogonality of the uplink control channel by the time-varying channel, and the non-coherent detection performance of the uplink channel is improved.
最后应当说明的是:以上实施例仅用以说明本发明的技术方案而非对 其限制; 尽管参照较佳实施例对本发明进行了详细的说明, 所属领域的普 通技术人员应当理解: 依然可以对本发明的具体实施方式进行修改或者对 部分技术特征进行等同替换; 而不脱离本发明技术方案的精神, 其均应涵 盖在本发明请求保护的技术方案范围当中。
It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not to be construed as limiting thereof; although the present invention will be described in detail with reference to the preferred embodiments, those skilled in the art should understand that The invention is not limited to the spirit of the technical solutions of the present invention, and should be included in the scope of the technical solutions claimed in the present invention.
Claims
1、 一种发射功率调整方法, 其特征在于, 包括: A method for adjusting a transmission power, comprising:
接收下行导频信号, 获得各个时频块信号的信道增益值; Receiving a downlink pilot signal, and obtaining a channel gain value of each time-frequency block signal;
根据所述信道增益值对所述各个时频块信号的原始发射功率进行调整, 获得所述各个时频块信号的实际发射功率。 And adjusting an original transmit power of each of the time-frequency block signals according to the channel gain value to obtain an actual transmit power of the respective time-frequency block signals.
2、 根据权利要求 1所述的发射功率调整方法, 其特征在于, 所述根据信 道增益值对所述各个时频块信号的原始发射功率进行调整的操作包括: 将所 述各个时频块信号的原始发射功率除以所述信道增益, 获得新的各个时频块 信号的实际发射功率。 The transmission power adjustment method according to claim 1, wherein the adjusting the original transmission power of each time-frequency block signal according to a channel gain value comprises: using the respective time-frequency block signals The original transmit power is divided by the channel gain to obtain the actual transmit power of the new respective time-frequency block signals.
3、 根据权利要求 2所述的发射功率调整方法, 其特征在于, 在获得实际 发射功率后, 对所述各个时频块信号判断实际发射功率是否符合预设范围, 如果时频块信号的实际发射功率不在预设范围内, 则以预定发射功率值作为 该时频块信号的实际发射功率。 The method for adjusting a transmit power according to claim 2, wherein after obtaining the actual transmit power, determining whether the actual transmit power meets a preset range for the respective time-frequency block signals, if the actual time-frequency block signal is If the transmit power is not within the preset range, the predetermined transmit power value is used as the actual transmit power of the time-frequency block signal.
4、 根据权利要求 2或 3所述的发射功率调整方法, 其特征在于, 在除以 所述信道增益之前, 还包括将所述信道增益量化为预设相位和 /或幅度的数 值。 The transmission power adjustment method according to claim 2 or 3, characterized in that before dividing by the channel gain, the method further comprises quantizing the channel gain to a value of a preset phase and/or amplitude.
5、 根据权利要求 2所述的发射功率调整方法, 其特征在于, 在获得所述 各个时频块信号的实际发射功率后, 根据所述各个时频块信号的原始发射功 率和实际发射功率分别计算获得总原始发射功率和总实际发射功率, 如果所 述总实际发射功率大于总原始发射功率, 则对所述各个时频块的实际发射功 率执行归一化操作。 The transmission power adjustment method according to claim 2, wherein after obtaining the actual transmission power of the respective time-frequency block signals, respectively, according to the original transmission power and the actual transmission power of the respective time-frequency block signals, respectively The total original transmit power and the total actual transmit power are calculated. If the total actual transmit power is greater than the total original transmit power, a normalization operation is performed on the actual transmit power of the respective time-frequency blocks.
6、 根据权利要求 5所述的发射功率调整方法, 其特征在于, 如果所述总 实际发射功率大于总原始发射功率, 则执行预设次数的归一化操作。 The transmission power adjustment method according to claim 5, wherein if the total actual transmission power is greater than the total original transmission power, a predetermined number of normalization operations are performed.
7、 根据权利要求 5所述的发射功率调整方法, 其特征在于, 如果所述总 实际发射功率大于总原始发射功率, 且所述总实际发射功率与总原始发射功 率的比值小于预设阈值, 则直接采用所述实际发射功率进行信号发射, 否则 执行实际发射功率归一化操作。
The method for adjusting a transmit power according to claim 5, wherein if the total actual transmit power is greater than the total original transmit power, and the ratio of the total actual transmit power to the total original transmit power is less than a preset threshold, Then, the actual transmission power is directly used for signal transmission, otherwise the actual transmission power normalization operation is performed.
8、 根据权利要求 5或 6或 7所述的发射功率调整方法, 其特征在于, 所 述归一化操作为将所述各个时频块信号的实际发射功率均乘以调整系数, 获 得新的实际发射功率。 The transmission power adjustment method according to claim 5 or 6 or 7, wherein the normalization operation is to multiply the actual transmission power of each time-frequency block signal by an adjustment coefficient to obtain a new one. Actual transmit power.
9、 根据权利要求 8所述的发射功率调整方法, 其特征在于, 所述调整系 数的计算公式为: =∑IT«I Z∑lS'j | , 其中 δ表示调整系数, Tij表示各个时频块的实际发射 功率, S ij表示各个时频块的原始发射功率, i表示发射信号所占资源块的子载 波的序号, j表示发射信号所占资源块的符号, i、 j为自然数。 The transmission power adjustment method according to claim 8, wherein the adjustment coefficient is calculated as: ∑I T «IZ∑l S 'j | , where δ represents an adjustment coefficient, and Tij represents each time The actual transmit power of the frequency block, S ij represents the original transmit power of each time-frequency block, i represents the sequence number of the sub-carrier of the resource block occupied by the transmit signal, j represents the symbol of the resource block occupied by the transmit signal, and i and j are natural numbers.
10、 根据权利要求 1所述的发射功率调整方法, 其特征在于, 进一步包 括: 10. The method according to claim 1, further comprising:
判断信号发射的信道是否满足相干条件, 是则执行功率调整操作, 否则 直接采用原始发射功率进行信号发射。 If it is judged whether the channel transmitted by the signal satisfies the coherent condition, the power adjustment operation is performed, otherwise the original transmission power is directly used for signal transmission.
11、 根据权利要求 10所述的发射功率调整方法, 其特征在于, 所述判断 信号发射的信道是否满足相干条件包括: The method for adjusting a transmit power according to claim 10, wherein the determining whether the channel transmitted by the signal satisfies the coherent condition comprises:
判断所述终端的速度是否超过速度阈值, 如果超过, 则不满足相干条件; 或者 Determining whether the speed of the terminal exceeds a speed threshold, and if it exceeds, the coherent condition is not satisfied; or
判断所述各个时频块信号的信道增益值的变化幅度是否超过幅度阈值, 如果超过, 则不满足相干条件; 或者 Determining whether a variation amplitude of a channel gain value of each time-frequency block signal exceeds an amplitude threshold, and if it exceeds, a coherent condition is not satisfied; or
判断所述各个时频块信号的信道增益值的实部或虚部的符号连续变化的 次数是否超过次数阈值, 如果超过, 则不满足相干条件。 It is judged whether the number of consecutive changes of the sign of the real part or the imaginary part of the channel gain value of each time-frequency block signal exceeds the number of times threshold, and if it exceeds, the coherent condition is not satisfied.
12、 一种发射功率调整装置, 其特征在于, 包括: 12. A transmit power adjustment device, comprising:
信道增益获得模块, 用于根据下行导频信号获得各个时频块信号的信道 增益值; a channel gain obtaining module, configured to obtain a channel gain value of each time-frequency block signal according to the downlink pilot signal;
发射功率调整模块, 与所述信道增益获得模块相连, 用于根据所述信道 增益值对所述各个时频块信号的原始发射功率进行调整, 获得所述各个时频 块信号的实际发射功率。 And a transmit power adjustment module, configured to be connected to the channel gain obtaining module, configured to adjust an original transmit power of each time-frequency block signal according to the channel gain value, to obtain an actual transmit power of each time-frequency block signal.
1 3、 根据权利要求 12所述的发射功率调整装置, 其特征在于, 所述发射
功率调整模块进一步包括计算模块, 与所述信道增益获得模块相连, 用于将 所述各个时频块信号的原始发射功率除以所述信道增益, 获得新的各个时频 块信号的实际发射功率。 The transmission power adjusting device according to claim 12, wherein the transmitting The power adjustment module further includes a calculation module, and is connected to the channel gain obtaining module, configured to divide the original transmit power of the respective time-frequency block signals by the channel gain, to obtain an actual transmit power of each new time-frequency block signal. .
14、 根据权利要求 1 3所述的发射功率调整装置, 其特征在于, 所述发射 功率调整模块还包括发射功率判断模块, 用于判断所述各个时频块信号的实 际发射功率是否符合预设范围, 如果时频块信号的实际发射功率不在预设范 围内, 则以预定发射功率值作为该时频块信号的实际发射功率。 The transmit power adjustment device according to claim 13, wherein the transmit power adjustment module further includes a transmit power determining module, configured to determine whether an actual transmit power of each time-frequency block signal conforms to a preset Range, if the actual transmit power of the time-frequency block signal is not within the preset range, the predetermined transmit power value is used as the actual transmit power of the time-frequency block signal.
15、 根据权利要求 1 3或 14所述的发射功率调整装置, 其特征在于, 所 述发射功率调整模块还包括量化模块, 用于将所述信道增益量化为预设相位 和 /或幅度的数值。 The transmission power adjustment apparatus according to claim 13 or 14, wherein the transmission power adjustment module further comprises a quantization module, configured to quantize the channel gain to a preset phase and/or amplitude value. .
16、 根据权利要求 1 3所述的发射功率调整装置, 其特征在于, 所述发射 功率调整模块还包括: The transmit power adjustment device according to claim 13, wherein the transmit power adjustment module further includes:
总原始功率计算模块, 与所述计算模块相连, 用于根据所述各个时频块 信号的原始发射功率计算总原始发射功率; a total original power calculation module, configured to be connected to the calculation module, configured to calculate a total original transmit power according to an original transmit power of each of the time-frequency block signals;
总实际发射功率模块, 与所述计算模块相连, 用于根据所述各个时频块 信号的实际发射功率计算总实际发射功率; And a total actual transmit power module, configured to be connected to the calculation module, configured to calculate a total actual transmit power according to an actual transmit power of each time-frequency block signal;
归一化模块, 与所述总原始功率计算模块和总实际发射功率模块相连, 用于在获得所述各个时频块信号的实际发射功率后, 如果所述总实际发射功 率大于总原始发射功率,将所述各个时频块的实际发射功率进行归一化操作。 a normalization module, configured to be connected to the total original power calculation module and the total actual transmit power module, after obtaining the actual transmit power of the respective time-frequency block signals, if the total actual transmit power is greater than the total original transmit power And normalizing the actual transmit power of each time-frequency block.
17、 根据权利要求 12所述的发射功率调整装置, 其特征在于, 还包括相 干条件判断模块, 与所述信道增益获得模块和发射功率调整模块相连, 用于 判断信号发射的信道是否满足相干条件, 是则执行调整操作, 否则直接采用 原始发射功率进行信号发射。 The transmitting power adjusting device according to claim 12, further comprising a coherent condition determining module, connected to the channel gain obtaining module and the transmit power adjusting module, configured to determine whether the channel transmitted by the signal satisfies a coherent condition , Yes, the adjustment operation is performed, otherwise the original transmission power is directly used for signal transmission.
18、 一种时分双工系统, 其特征在于, 包括至少一个发射功率调整装置, 所述发射功率调整装置用于根据下行导频信号获得各个时频块信号的信道增 益值,根据所述信道增益值对所述各个时频块信号的原始发射功率进行调整, 获得所述各个时频块信号的实际发射功率。
A time division duplex system, comprising: at least one transmit power adjustment device, wherein the transmit power adjustment device is configured to obtain a channel gain value of each time-frequency block signal according to the downlink pilot signal, according to the channel gain The values are adjusted for the original transmit power of the respective time-frequency block signals to obtain the actual transmit power of the respective time-frequency block signals.
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CN101873615A (en) | 2009-04-27 | 2010-10-27 | 松下电器产业株式会社 | Wireless communication system and downlink receiving power detection method thereof |
CN103458530B (en) * | 2013-09-05 | 2017-01-25 | 华为技术有限公司 | Random access method and user equipment |
CN103686766B (en) * | 2013-12-27 | 2017-03-22 | 京信通信系统(中国)有限公司 | Adapting method and device for GSM (Global System for Mobile Communications) base station amplifier signal coverage |
CN109041189B (en) * | 2018-07-20 | 2021-07-30 | 深圳全志在线有限公司 | Transmission power control method and device of wireless communication equipment |
CN109474306B (en) * | 2018-09-20 | 2021-01-26 | 中国人民解放军63653部队 | Detection and judgment method based on direct sequence spread spectrum signal capture |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1136242A (en) * | 1995-04-25 | 1996-11-20 | 美国电报电话Ipm公司 | Method and apparatus for power control in wireless networks |
CN1512802A (en) * | 2002-12-27 | 2004-07-14 | 皇家飞利浦电子股份有限公司 | Mobile terminal with power control and method |
US20060068827A1 (en) * | 2004-09-28 | 2006-03-30 | Lucent Technologies, Inc. | Measuring power of a pilot channel of a transmit signal |
CN1941689A (en) * | 2005-09-29 | 2007-04-04 | 上海原动力通信科技有限公司 | Method for dispatching sub-frequency band of time-division duplex OFDM system |
-
2007
- 2007-05-31 CN CNA2007101093959A patent/CN101316125A/en active Pending
-
2008
- 2008-05-30 WO PCT/CN2008/071150 patent/WO2008145073A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1136242A (en) * | 1995-04-25 | 1996-11-20 | 美国电报电话Ipm公司 | Method and apparatus for power control in wireless networks |
CN1512802A (en) * | 2002-12-27 | 2004-07-14 | 皇家飞利浦电子股份有限公司 | Mobile terminal with power control and method |
US20060068827A1 (en) * | 2004-09-28 | 2006-03-30 | Lucent Technologies, Inc. | Measuring power of a pilot channel of a transmit signal |
CN1941689A (en) * | 2005-09-29 | 2007-04-04 | 上海原动力通信科技有限公司 | Method for dispatching sub-frequency band of time-division duplex OFDM system |
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