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WO2003036997A1 - Procede d'evaluation du sinr d'une communication mobile cellulaire et appareil de mise en oeuvre de ce procede - Google Patents

Procede d'evaluation du sinr d'une communication mobile cellulaire et appareil de mise en oeuvre de ce procede Download PDF

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Publication number
WO2003036997A1
WO2003036997A1 PCT/CN2001/001503 CN0101503W WO03036997A1 WO 2003036997 A1 WO2003036997 A1 WO 2003036997A1 CN 0101503 W CN0101503 W CN 0101503W WO 03036997 A1 WO03036997 A1 WO 03036997A1
Authority
WO
WIPO (PCT)
Prior art keywords
pilot
sinr
value
channel
calculation module
Prior art date
Application number
PCT/CN2001/001503
Other languages
English (en)
Chinese (zh)
Inventor
Dongdong Shen
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 PCT/CN2001/001503 priority Critical patent/WO2003036997A1/fr
Priority to CN01822861.5A priority patent/CN1221147C/zh
Publication of WO2003036997A1 publication Critical patent/WO2003036997A1/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]
    • H04W52/18—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
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences

Definitions

  • the present invention relates to a cellular mobile communication system, and in particular, to a SINR estimation method for measuring a non-constant envelope modulation signal in a cellular mobile communication system and a device for implementing the method.
  • Background technique :
  • SINR signal to interference & noise ratio
  • ACI adjacent Cel l Interference
  • a SINR measurement method proposed in WCDMA is to calculate the SINR measurement value by calculating the variance of the received signal ("Physical Layer Standard for WCDMA, 3GPP TS25. 211 ");
  • the variance of the received signal (“Physical Layer Standard for WCDMA, 3GPP TS25. 211 ");
  • the main object of the present invention is to provide a SINR estimation method for cellular mobile communications, which performs SINR estimation for non-constant envelope modulation signals, and can be used in conditions where multi-cell interference exists In addition, and under arbitrary channel fading conditions, the SINR value is accurately estimated.
  • Another object of the present invention is to provide a device for implementing SINR estimation in cellular mobile communications, which does not require complicated calculation when performing SINR estimation on non-constant envelope modulation signals, It is simple and can be applied to fast power control in communication systems.
  • a SINR estimation method for cellular mobile communication in which the first subframe of a traffic channel frame structure is used to send pilot symbols, the remaining subframes are used to send service signals, and the subframes used to send pilot symbols are switched.
  • the pilot structure of the channel is used at the receiving end to complete the channel estimation of the service channel through the switched pilot structure.
  • the above-mentioned switched pilot structure is: In two consecutive time slots in a subframe, one time slot is used to transmit fixed pilot symbols, and the other time slot does not transmit any signals.
  • the pilot channel Closed In two consecutive time slots in a subframe, one time slot is used to transmit fixed pilot symbols, and the other time slot does not transmit any signals.
  • the pilot channel Closed In two consecutive time slots in a subframe, one time slot is used to transmit fixed pilot symbols, and the other time slot does not transmit any signals.
  • the receiving end completes the channel estimation of the service channel through the switched pilot structure and includes at least the following steps:
  • Step 1 The receiving end sequentially extracts pilot symbols in adjacent slots in the subframe, obtains a pilot signal strength, and calculates an average value of the pilot symbol energy in the subframe;
  • Step 2 Calculate the average energy value of the interference noise in the subframe
  • Step 3 Calculate the SINR estimated value of the pilot symbols in the subframe, that is, the SINR statistical value of the pilot channel;
  • Step 4 According to the position of the current traffic channel multilevel signal in the constellation diagram, the SINR estimation of the traffic channel is obtained from the correspondence between the pilot symbols and the traffic symbols, and the SINR statistics of the pilot channel in step 3. value.
  • An apparatus for implementing a SINR estimation method for cellular mobile communication which at least includes:
  • the first device is configured to measure the SINR estimated value of the pilot signal according to the switched pilot structure.
  • the second device is configured to receive the output of the first device and calculate the SINR estimated value of the service channel based on the pilot signal SI estimated value.
  • the first device includes at least: a demodulation device, a serial parallel device, an adder, a first calculation device, a squarer, a divider, a second calculation device, and a logarithmic calculation module;
  • the demodulation device demodulates the pilot received signal and outputs it to the serial-parallel device.
  • the output of the serial-parallel device is divided into two paths: The first path is connected to an adder.
  • the adder extracts the pilot signal strength and outputs it to a first computing device for accumulation and average.
  • the first computing device outputs the average to a squarer, and the pilot signal is calculated in the squarer. Energy value, and then output the energy value to the divider;
  • the second channel is connected to a second calculation device, which calculates an average value of the power statistics of noise and interference, and outputs the average value to the divider;
  • the divider outputs its operation result to a logarithmic calculation module, and the logarithmic calculation module converts it into the pilot S INR estimation value.
  • the second device includes at least: a service symbol receiver demodulation device, a calculation module, a logarithmic calculation module, a calculation device, and an adder;
  • the service symbol receiver demodulation device demodulates a service received signal and outputs the demodulated signal to a calculation module.
  • the calculation module determines a ratio factor between the constellation of the demodulated symbol and the pilot symbol and outputs the factor to the pair.
  • a number calculation module, a logarithm calculation module accumulates all the ratio factors in a frame, and outputs it to a calculation device to calculate an average value. The average value is sent to the adder together with the calculated pilot SINR estimate value, and the adder calculates the service. SINR estimate of the symbol.
  • Figure 1 is a basic block diagram of a cellular mobile communication system.
  • FIG. 1 is a schematic diagram of a frame structure according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a switched pilot subframe structure according to the present invention.
  • FIG. 4 is a 16QAM constellation diagram used in a preferred embodiment of the present invention.
  • FIG. 5 is a principle block diagram of the SINR estimation device of the present invention.
  • Figure 6 is a graphical display of the rectangular 16QAM constellation Q function.
  • FIG. 7 is a statistical graph of normalized variance of the present invention. detailed description:
  • FIG. 1 it is a block diagram of an implementation of a cellular mobile communication system in the prior art.
  • a signal sent from a transmitter of a communication system is sent to a receiver of the communication system through a multipath fading channel, it will be subject to multiple access interference MAI and neighboring cell interference ACI.
  • MAI multiple access interference
  • ACI neighboring cell interference
  • background noise is also inevitable of.
  • the impulse response of a multipath fading channel can be quantitatively described by the following formula (1):
  • h ⁇ t j a k e ⁇ 5 ⁇ t-T k ) (1)
  • a k , e k , T k are the fading factors, phase offsets, and delay spreads of each channel, respectively;
  • L is Channel multipath weight.
  • the signal of the receiver front end at sampling time 1 in FIG. 1 is: rrS pI + I 1 + n J ; where S pl and I n are the received signal sampling value and pilot at time 1.
  • the signal expression at sampling time 1 is: Among them, the definition of r I is the same as that of the pilot, and 7 represents the sampled value of the service signal at time 1.
  • the length of the sub-frame is set to 20ms. Since the length of one sub-frame is about 20ms, it can be generally considered that the fading characteristics of the channel in the length of one sub-frame are almost constant, that is, The parameters of the channel remain unchanged during this time. Therefore, this short-term invariance can be used to extract the actual pilot symbol strength and make statistics on noise and interference.
  • FIG. 2 it is a frame structure of a traffic channel of a communication system designed according to the method of the present invention.
  • each frame there are several subframes, where the first subframe is used to send pilot symbols, and the other subframes are used to send service signals.
  • the length of the subframe used for transmitting pilot symbols is 2L, where L is the number of non-zero pilot symbols, and the specific value is determined by the structure of the pilot frame, that is, a pilot whose SINR estimation period T SINR is 2L times Symbolic time.
  • the switched pilot structure of the present invention transmits fixed pilot symbols in time slots on odd bits, the energy of the pilot symbols is known, and no signal is transmitted in time slots on even bits, Guide The frequency channel is closed. Therefore, at the receiver side, the average strength of the pilot symbols can be extracted through the two adjacent time slots, that is, the detection symbols of the odd bits are subtracted from the null symbols of the even bits. Another advantage of this processing is that the noise and interference are zero-mean processed to make the estimation of signal strength more accurate.
  • a total of L pilot symbols can be extracted.
  • the L pilot symbols need to be averaged. Since the pilot signal is closed, the received signal at the receiver contains only noise and interference, so this part of the idle state can be used to estimate the strength of noise and interference. In this way, the following formula (2) can be used to obtain the average pilot SINR value in an SI R SINR estimation period.
  • SINR pilo! Referring to FIG. 4, according to the strength of each signal in the constellation, the signals can be divided into three different levels, that is, in the 16QAM modulation constellation diagram in a preferred embodiment of the present invention, figure 0, figure X, and figure ⁇ is an energy symbol representing three different levels, and the ratio of the intensity of the signal at each level to the intensity of the pilot symbol is also fixed. Therefore, according to the modulated service symbol and the known pilot To estimate the SINR estimate for each service symbol.
  • SINR ⁇ C SINR pilol ⁇ (3) where N is the length of the service symbol.
  • the demodulation device 501 demodulates the received pilot signal, and then outputs the demodulated device to a series of parallelization device 502.
  • the serial conversion and parallel device 502 further processes the signal, its output is used to extract the signal strength of the pilot symbols in adjacent time slots through a subtractor 503, and the signal strength is accumulated and averaged in a computing device 504, and the squarer
  • the average pilot signal strength is calculated in 505, and the value is then input to the divider 506.
  • the output signal from the above-mentioned serial-parallel device 502 is also input to the computing device 507, and the computing device 507 estimates the noise And the intensity of the interference, and calculate the average value.
  • the output of the calculation device 507 is also sent to the divider 506.
  • the divider 506 and the logarithmic calculation module 508 connected in series perform the two signals entering the divider. Calculate to get the estimated value of the calculated pilot SINR.
  • the service received signal is demodulated in the service symbol receiver demodulation device 513 and output to the calculation module 512.
  • the calculation module 512 determines the power level between the pilot signal and the demodulated service signal according to the energy level of the service demodulation symbol constellation diagram.
  • the ratio factor is then calculated in the logarithmic calculation module 511 and output by the logarithmic calculation module 511 to the calculation device 510 for accumulation and averaging.
  • the result is input to the addition together with the pilot SINR estimation value output by the calculator 508.
  • the router 509 the SIM estimated value of the service symbol is finally obtained.
  • FIG. 6 it is a rectangular 16QAM constellation diagram.
  • the constellation is divided into three levels according to strength.
  • the SINR estimation accuracy of the service symbol largely depends on the error probability performance of the service symbol.
  • the symbol error probability versus SINR will be analyzed in detail. Impact of estimation accuracy.
  • the error probability of a signal with level 1 is:
  • the error probability of a signal of level 1 is
  • the rating probability for a signal of level 3 is
  • FIG. 7 shows the normalized variance of the SINR estimates of the pilot and service symbols obtained according to the present invention in a 120 km / h vehicle speed environment. It can be seen from FIG. 7 that the estimation accuracy of the pilot symbol is better than the estimation accuracy of the traffic symbol, which is consistent with the above-mentioned analysis of the probability error estimation of the traffic symbol. From the statistics point of view, the normalized variance 10-3-10-2 of the order, such estimation accuracy is relatively high.

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

Abstract

La présente invention se rapporte à un procédé d'évaluation du SINR d'une communication mobile cellulaire ainsi qu'à l'appareil permettant de mettre en oeuvre ledit procédé. La première sous-trame de la structure de trames du canal de trafic est utilisée pour transmettre le symbole pilote. Les autres sous-trames sont utilisées pour transmettre le signal de trafic, et parmi elles les sous-trames qui transmettent le symbole pilote présentent une structure tout-ou-rien. L'évaluation du canal de trafic est effectuée par la structure pilote tout-ou-rien au niveau du terminal de réception; ledit procédé permettant d'évaluer de manière précise la valeur du SINR dans le cas de l'existence d'une interface multicellulaire et de l'évanouissement d'un canal arbitraire. Le procédé de l'invention peut être facilement mis en oeuvre et il peut être utilisé pour une régulation rapide de la puissance d'émission dans un système de communication.
PCT/CN2001/001503 2001-10-25 2001-10-25 Procede d'evaluation du sinr d'une communication mobile cellulaire et appareil de mise en oeuvre de ce procede WO2003036997A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2001/001503 WO2003036997A1 (fr) 2001-10-25 2001-10-25 Procede d'evaluation du sinr d'une communication mobile cellulaire et appareil de mise en oeuvre de ce procede
CN01822861.5A CN1221147C (zh) 2001-10-25 2001-10-25 蜂窝移动通信的sinr估计方法及其实现装置

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102547367A (zh) * 2005-04-04 2012-07-04 塔特公司 信号质量估计和控制系统

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109889286B (zh) * 2019-01-31 2021-11-16 成都源创视达科技有限公司 一种基于导频信号的信噪比估计方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5712877A (en) * 1995-05-26 1998-01-27 Simon Fraser University Pilot-symbol aided continuous phase modulation system
EP0913971A2 (fr) * 1997-11-03 1999-05-06 Nokia Mobile Phones Ltd. Estimation de canal dans un système cellulaire de communication AMDC
WO1999067962A1 (fr) * 1998-06-20 1999-12-29 Samsung Electronics Co., Ltd. Dispositif et procede assurant une selection de transmission en diversite dans un systeme de communication mobile

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5712877A (en) * 1995-05-26 1998-01-27 Simon Fraser University Pilot-symbol aided continuous phase modulation system
EP0913971A2 (fr) * 1997-11-03 1999-05-06 Nokia Mobile Phones Ltd. Estimation de canal dans un système cellulaire de communication AMDC
WO1999067962A1 (fr) * 1998-06-20 1999-12-29 Samsung Electronics Co., Ltd. Dispositif et procede assurant une selection de transmission en diversite dans un systeme de communication mobile

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102547367A (zh) * 2005-04-04 2012-07-04 塔特公司 信号质量估计和控制系统

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CN1493162A (zh) 2004-04-28
CN1221147C (zh) 2005-09-28

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