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WO2002039686A1 - Procede d'evaluation d'un canal et appareil associe - Google Patents

Procede d'evaluation d'un canal et appareil associe Download PDF

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Publication number
WO2002039686A1
WO2002039686A1 PCT/CN2000/000420 CN0000420W WO0239686A1 WO 2002039686 A1 WO2002039686 A1 WO 2002039686A1 CN 0000420 W CN0000420 W CN 0000420W WO 0239686 A1 WO0239686 A1 WO 0239686A1
Authority
WO
WIPO (PCT)
Prior art keywords
amplitude
power control
pilot
signal
channel
Prior art date
Application number
PCT/CN2000/000420
Other languages
English (en)
Chinese (zh)
Inventor
Cosmos Zhang
Daoben Li
Original Assignee
Linkair Communications, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Linkair Communications, Inc. filed Critical Linkair Communications, Inc.
Priority to AU2001212666A priority Critical patent/AU2001212666A1/en
Priority to PCT/CN2000/000420 priority patent/WO2002039686A1/fr
Priority to CN00813629.7A priority patent/CN1188957C/zh
Publication of WO2002039686A1 publication Critical patent/WO2002039686A1/fr

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Classifications

    • 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]
    • H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
    • H04L25/023—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols
    • H04L25/0232—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols by interpolation between sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70701—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation featuring pilot assisted reception

Definitions

  • the present invention relates to the fields of wireless spread-spectrum communication and digital mobile communication, and in particular, to a channel estimation method suitable for various modulation modes under high data rate transmission and a device for implementing the method.
  • pilot channel estimation (see 3GPP TS25.211).
  • the dedicated pilot channel estimation method is to transmit a pilot symbol at a certain interval in each channel of the transmitting end, and use the channel parameters estimated by the pilot symbol to perform channel compensation on the data symbols following the pilot symbol, so that Eliminate the impact of the channel on the transmitted signal.
  • the channel estimation of the service signal is obtained by interpolation calculation based on the channel characteristics estimated by the pilot symbols before and after it.
  • this method is only feasible for single-level modulation, such as QPSK used in WCDMA, because in single-level modulation In this mode, the channel estimation only needs to estimate the change of the phase characteristics of the channel, but does not need to estimate the change of the amplitude, that is, in the single-level modulation mode, it is not necessary to consider the influence on the estimation of the channel amplitude due to power control.
  • multi-level modulation methods such as 16QAM, 64QAM, etc.
  • the amplitude of adjacent pilot symbols will be affected not only by the channel's amplitude fading, but also by the power control.
  • the magnitude of the adjacent pilot symbols not only reflects the change in channel amplitude during this time period, but also includes the change in transmit power caused by power control. Therefore, there is a large error in the estimated value of the channel amplitude obtained by using this dedicated pilot channel estimation method, which cannot accurately and effectively guarantee the correctness of the channel estimation, and furthermore cannot guarantee the application of higher-dimensional Modulation. Summary of the invention
  • the channel estimation method and device for high data rate transmission and high-speed mobile environment provided by the present invention are obtained by adding a time division dedicated pilot channel estimation method commonly used in the prior art? Wenjin can greatly reduce the estimation error of the channel amplitude caused by the power control technology, and can adapt to various modulation modes, especially the multilevel modulation mode in a CDMA system with power control.
  • a time division pilot channel estimation method applied in a code division multiple access (CDMA) system provided by the present invention is that when channel estimation is performed by using the time division pilot method, after obtaining amplitude estimates of adjacent pilot symbols, First use the power control command corresponding to the pilot symbol known by the receiver to modify the amplitude value of one of the pilot symbols to eliminate the influence of power control on the signal amplitude, and then obtain the service signal in between by interpolation. Channel estimation results.
  • CDMA code division multiple access
  • the method may further include the following steps:
  • the above-mentioned modified amplitude value of a pilot symbol may be: when the power control command is to increase transmit power, then multiply the amplitude estimated value of the previous pilot symbol by 10 1 , or the estimated amplitude value of the next pilot symbol Multiply by ⁇ ⁇ ; When the power control command is to reduce transmit power, multiply the estimated amplitude of the previous pilot symbol by ⁇ 55 , or multiply the estimated amplitude of the next pilot symbol by ⁇ ; where ⁇ is the power control Step size.
  • a time division pilot channel estimator applied in a code division multiple access (CDMA) system includes at least:
  • a signal demodulation and despreading device to despread and demodulate a received signal
  • a splitter that separates a pilot signal and a service signal
  • the pilot channel estimator uses the pilot signal to perform channel estimation to obtain an estimated value of the channel amplitude and phase;
  • the arithmetic unit 1 uses the power control command corresponding to the pilot symbol known by the receiver between adjacent pilot symbols to modify the obtained channel amplitude estimation value to modify one of the adjacent pilot symbols.
  • the amplitude of each pilot symbol to eliminate the influence of power control on the signal amplitude;
  • the arithmetic unit 2 obtains the channel estimation result of the service signal between the pilot symbols by interpolation according to the channel phase estimation value and the modified amplitude estimation value obtained above;
  • the phase compensator uses the above channel estimation result to perform phase compensation on the service signal; and a merger and decision unit combines the phase-compensated service signal to determine and output data.
  • the arithmetic unit 1 may be a multiplier, and its inputs are the amplitude estimates of the channels output by the pilot channel estimator and the power output by the power control command generator in the receiver. Control commands;
  • the power control command between adjacent pilot symbols When the power control command between adjacent pilot symbols is to increase transmission power, multiply the estimated amplitude value of the previous pilot symbol by 1 or multiply the estimated amplitude value of the next pilot symbol by 1 / 10 ⁇ ; To reduce the transmission power, the power control command between adjacent pilot symbols is to multiply the estimated amplitude of the previous pilot symbol by l / io, or to multiply the estimated amplitude of the next pilot symbol by
  • the channel estimator according to the above technical solution may further include a delayer, and the channel estimation result of the corresponding pilot symbol service signal obtained through the interpolation of the operator 2 is sent to the phase compensator to the service after the delayer delays.
  • the signal is phase compensated.
  • the merging and deciding device may be a maximum ratio merging and deciding device, which performs maximum ratio merging on the phase-compensated service signal, determines and outputs data.
  • a signal receiving system in a code division multiple access (CDMA) system to which the present invention is applied includes a receiving antenna, an intermediate frequency radio frequency demodulation section, a despreading section, a channel estimation and decision section, a decoding and source recovery section, wherein:
  • the channel estimation and decision part adopts the time division pilot channel estimator of the present invention, including a splitter, a pilot channel estimator, an operator 1, an operator 2 and a phase compensation and merging and decision device, wherein the despreading is performed.
  • the demodulated signal separates the pilot signal and the service signal through a splitter, estimates the phase and amplitude of the channel through the pilot channel estimator, and corrects the estimated amplitude through the arithmetic unit 1 to eliminate power control on the signal amplitude.
  • the influence of the channel estimation result of the service signal between the corresponding pilot symbols is obtained by the operator 2 through interpolation, the channel estimation result is output to the phase compensation device, the phase compensation is performed on the service signal, and the phase compensation is performed in the combination and decision device.
  • the subsequent service signals are combined, judged and output data.
  • the arithmetic unit 1 may be a multiplier, and its inputs are the amplitude estimates of the channels output by the pilot channel estimator and the power output by the power control command generator in the receiver. Control commands;
  • the estimated amplitude value of the previous pilot symbol is multiplied by 1 ⁇ , or the estimated amplitude value of the next pilot symbol is multiplied by ⁇ / ⁇ 3 ⁇ 4 ;
  • the power control command between adjacent pilot symbols is to reduce the transmission power, multiply the estimated amplitude value of the previous pilot symbol by ⁇ / ⁇ , or multiply the estimated amplitude value of the next pilot symbol by
  • the merging and deciding device may be a maximum ratio merging and deciding device, which performs maximum ratio merging on the phase-compensated service signal to determine and output data.
  • the signal receiving system may further include a delayer, and the channel estimation result of the corresponding pilot symbol service signal obtained through the interpolation of the operator 2 is sent to the phase compensator to the service after being delayed by the delayer.
  • the signal is phase compensated.
  • the power control step size can be transmitted to the transmitter in real time by signaling.
  • the receiver may be set by the system and announced in the form of broadcast, etc.
  • the channel estimation technology disclosed in the present invention uses the power control bits formed in the receiver and a certain power control step to eliminate the estimation error of the channel amplitude caused by the adoption of the power control technology in the existing channel estimation technology. Thus, the channel estimation in the multilevel modulation mode is realized.
  • the channel estimation technology disclosed in the present invention overcomes the defect that the time division dedicated pilot channel estimation in the prior art cannot be applied to a high-dimensional modulation method, and not only retains the existing All the advantages of the dedicated time-division pilot channel estimation in the technology can be applied to various modulation modes. And in the presence of power control
  • Figure 1 is a simple schematic block diagram of a CDMA mobile communication system.
  • Fig. 2 is a block diagram of a preferred embodiment according to the present invention.
  • Fig. 3 shows the performance comparison between the simulation curve of the present invention and the prior art under the 16QAM modulation mode.
  • FIG. 1 shows a simple CDMA mobile communication system.
  • the source generator 101 generates a signal, which is encoded by the encoder 102, and after being spread by the spreader 103, the spread spectrum signal is sent to the modulator 104 for intermediate frequency and radio frequency modulation, and then the signal power is transmitted through the transmitting antenna 105.
  • the receiving antenna 106 receives the signal power, and then it is demodulated by the demodulator 107 into a baseband signal.
  • the despreader 108 completes the despreading process, and the channel estimation circuit 109 completes the translation.
  • the channel estimation required by the code and source recovery circuit 110, and according to the difference between the received signal and the interference level, a power control command is generated and transmitted to the transmitting end via the power control loop 111 for power control.
  • closed-loop power control In the existing CDMA system, power control technology is commonly used, and it is generally divided into open loop power control, closed loop power control and outer loop power control. Among them, closed-loop power control has the highest frequency, and its purpose is to partially track fast fading. Closed-loop power control requires an adjustment of the transmitted signal power within 0.5-lms.
  • the interval between adjacent time division pilot signals is roughly equivalent to the power control time period. In this way, different pilot signals are in different power control time periods. Therefore, the change in the amplitude of adjacent pilot signals not only reflects the change in channel amplitude characteristics during the time period, but also reflects the change in transmit power due to power control during the time period.
  • the same method as the phase estimation of the channel can be used, that is, the channel amplitude and phase characteristics estimated by adjacent pilot symbols are used, and according to a given algorithm, such as a linear interpolation algorithm or a Gaussian interpolation
  • the algorithm performs interpolation to obtain an estimated value of the channel amplitude and phase of the service signal between the pilot symbols.
  • the above-mentioned method for estimating the channel amplitude theoretically has errors and Defects. Because as described above, the magnitude of the adjacent pilot symbols not only reflects the change in channel amplitude during this time period, but also includes the change in transmit power caused by power control. Therefore, if there is no improvement, there will be errors in the estimated value of the channel amplitude.
  • the step size of the power control that is, the change value of the transmission power in the adjacent power control period is relatively large, such as IdB or 2dB
  • the error in the estimation of the channel amplitude due to the power control will also be large, which may The performance of the time division pilot channel method is drastically deteriorated or even unusable.
  • the control command is to measure the signal interference level of the receiver, so that the power control command is fed back to the transmitter. If the received signal quality is too low, the transmitter is required to increase a power control step size. The transmit power is reduced, and the transmit power is reduced by one power control step. That is to say, the receiver knows clearly and does not need any form of signaling to notify the receiving end of the power control action taken on any corresponding time period of the received signal, that is, to increase or decrease the transmission power.
  • the estimated value of the channel amplitude of the service signal is not obtained through interpolation immediately, because it will introduce power-induced Error due to change in transmit power.
  • the calculation of the increase value is simple. Assume that the step size of the power control is A dB, the amplitude increase value of the corresponding pilot symbol is 1 ( ⁇ times.
  • the power control performed during this time period is to reduce the transmission power, then modify the guidance according to the same principle.
  • the amplitude estimated value of the frequency symbol that is, before the interpolation calculation is performed, the amplitude estimated value of the subsequent pilot symbol is passed through a multiplier and multiplied by 10.
  • the amplitude estimation value of the previous pilot symbol is passed through a divider and divided by 10 ⁇ .
  • FIG. 2 illustrates a channel estimator according to the present invention for estimating the characteristics of a fading channel through pilot symbols and an interpolation algorithm.
  • the despread signal is obtained by the demodulation and despreading device 112, and then the despread pilot signal and the service signal are obtained respectively through the splitter 113; the pilot signal is used for channel estimation, so it uses the pilot channel estimation
  • the generator 114 obtains the channel amplitude and phase estimation values, where the amplitude value contains the influence of power control and must be removed; the power control bit generator 115 outputs the power control bit "1" or "0". Feedback to the transmitting end for actual power adjustment.
  • the multiplier of the multiplier 116 is 10 ⁇ or ⁇ is the power control step size, and its unit is dB.
  • the influence of power control is removed by the channel amplitude estimation value after the multiplier, so that the channel estimation of the service signal can be performed after 117, and the channel estimation value (including amplitude and phase) of the service signal can be obtained, and then passed through the delay 118. It is provided to the phase compensator 119 and the maximum ratio combining and judging device 120 to perform a service signal decision.
  • the above embodiments have clearly assumed that the size of the power control step size ⁇ is already known by the receiver, otherwise the receiver cannot know exactly the size of the channel amplitude estimate value that should be estimated for the pilot signal.
  • This step size There are two ways to get this step size: 1) The transmitter sends the step size to the receiver in real time through signaling; 2) The system sets a relatively fixed step size and announces it in the form of a broadcast.
  • FIG. 3 shows a simulation performance curve comparison between the present invention and the prior art in a 16QAM modulation mode.
  • the abscissa is Eb / No
  • the unit is db
  • the ordinate is the symbol error rate.
  • a dashed curve is provided according to the present invention.
  • the system performance curve obtained by the channel estimation method simulation.
  • the other solid curve is that the channel estimation method applied in the single-level modulation method is directly applied to the 16QAM modulation method without using the method provided by the present invention.
  • Simulation results It can be clearly seen from the simulation curve that the improved method of the present invention can bring about significant performance improvement, which is about 1-2 dB. A rough estimate shows that this is equivalent to bringing a 26% -58% increase in capacity to a CDMA system. Since the method disclosed in the present invention does not bring much complexity to the system, the gain brought by using the method disclosed in the present invention is undoubtedly worthwhile.
  • the idea of the present invention is applied to a signal receiving system in a code division multiple access (CDMA) system.
  • the signal receiving system includes a receiving antenna, an intermediate frequency radio frequency demodulation part, a despreading part, a channel estimation and decision part, a decoding and a source recovery. section.
  • the channel estimation and decision part is a time division pilot channel estimator using the technology of the present invention, which utilizes the power control bits formed in the receiver and a certain power control step size to eliminate the effects of power control in channel estimation on channel estimation.
  • the estimation error of the channel amplitude so as to realize the channel estimation in the multilevel modulation mode.
  • the present invention only provides the embodiment in the 16QAM modulation mode, for a higher-dimensional modulation mode, Those skilled in the art can obviously implement the present invention and obtain good channel estimation results.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention porte sur un procédé et un appareil permettant d'estimer un canal pilote à répartition dans le temps par le biais de la technologie de communication à spectre étalé visant à obtenir la valeur d'estimation de la phase et de l'amplitude grâce à des ondes pilotes adjacentes et visant également à corriger l'amplitude de l'un des symboles pilotes grâce à l'instruction de commande de puissance que le récepteur connaît. La correction a pour but de limiter l'influence du contrôle de rendement sur l'amplitude du signal. On obtient alors un résultat de l'estimation du canal grâce à une interpolation qui permet de calculer des valeurs intermédiaires. Ainsi, il est possible de s'adapter à différents procédés de modulation dans un système AMCR à contrôle de puissance, et plus particulièrement les procédés de modulation multiniveaux qui permettent d'améliorer sensiblement les performances d'un système de communication mobile.
PCT/CN2000/000420 2000-11-09 2000-11-09 Procede d'evaluation d'un canal et appareil associe WO2002039686A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2001212666A AU2001212666A1 (en) 2000-11-09 2000-11-09 A channel estimating method and apparatus thereof
PCT/CN2000/000420 WO2002039686A1 (fr) 2000-11-09 2000-11-09 Procede d'evaluation d'un canal et appareil associe
CN00813629.7A CN1188957C (zh) 2000-11-09 2000-11-09 信道估计方法及装置

Applications Claiming Priority (1)

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PCT/CN2000/000420 WO2002039686A1 (fr) 2000-11-09 2000-11-09 Procede d'evaluation d'un canal et appareil associe

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100336325C (zh) * 2002-06-19 2007-09-05 上海贝尔有限公司 瑞克接收机信道估计方法
CN114095319A (zh) * 2021-11-05 2022-02-25 成都中科微信息技术研究院有限公司 一种采用幅相分离技术的5g信道估计的时频平滑方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7701917B2 (en) * 2004-02-05 2010-04-20 Qualcomm Incorporated Channel estimation for a wireless communication system with multiple parallel data streams
WO2006045219A1 (fr) * 2004-10-29 2006-05-04 Telefonaktiebolaget Lm Ericsson (Publ) Évaluation de voie
CN103780570B (zh) * 2014-01-20 2017-07-25 安徽华东光电技术研究所 基于cofdm的高清视频传输系统
CN112737988B (zh) * 2020-12-29 2023-12-05 芯翼信息科技(上海)有限公司 一种信道估计方法、装置、电子设备及存储介质
CN116208445A (zh) * 2021-11-30 2023-06-02 上海华为技术有限公司 一种联合信道估计方法及相关设备

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000036760A1 (fr) * 1998-12-16 2000-06-22 Telefonaktiebolaget Lm Ericsson (Publ) Evaluation de canaux destinee a un systeme amdc utilisant des symboles pre-definis en sus des symboles pilotes
DE19913083A1 (de) * 1999-03-23 2000-09-28 Siemens Ag Verfahren und Vorrichtung zum Schätzen des Kanalzustands in einem Mobilfunksystem

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000036760A1 (fr) * 1998-12-16 2000-06-22 Telefonaktiebolaget Lm Ericsson (Publ) Evaluation de canaux destinee a un systeme amdc utilisant des symboles pre-definis en sus des symboles pilotes
DE19913083A1 (de) * 1999-03-23 2000-09-28 Siemens Ag Verfahren und Vorrichtung zum Schätzen des Kanalzustands in einem Mobilfunksystem

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100336325C (zh) * 2002-06-19 2007-09-05 上海贝尔有限公司 瑞克接收机信道估计方法
CN114095319A (zh) * 2021-11-05 2022-02-25 成都中科微信息技术研究院有限公司 一种采用幅相分离技术的5g信道估计的时频平滑方法
CN114095319B (zh) * 2021-11-05 2023-08-18 成都中科微信息技术研究院有限公司 一种采用幅相分离技术的5g信道估计的时频平滑方法

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CN1188957C (zh) 2005-02-09
CN1402922A (zh) 2003-03-12
AU2001212666A1 (en) 2002-05-21

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