WO2002045447A1 - Procede pour mesurer le rapport signal-parasites plus bruit - Google Patents

Procede pour mesurer le rapport signal-parasites plus bruit Download PDF

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Publication number
WO2002045447A1
WO2002045447A1 PCT/CN2000/000526 CN0000526W WO0245447A1 WO 2002045447 A1 WO2002045447 A1 WO 2002045447A1 CN 0000526 W CN0000526 W CN 0000526W WO 0245447 A1 WO0245447 A1 WO 0245447A1
Authority
WO
WIPO (PCT)
Prior art keywords
pilot symbols
different
interference
sinr measurement
different pilot
Prior art date
Application number
PCT/CN2000/000526
Other languages
English (en)
Chinese (zh)
Inventor
Michael Li
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 CNB008136319A priority Critical patent/CN1171489C/zh
Priority to AU2001216906A priority patent/AU2001216906A1/en
Priority to PCT/CN2000/000526 priority patent/WO2002045447A1/fr
Publication of WO2002045447A1 publication Critical patent/WO2002045447A1/fr
Priority to HK03102925A priority patent/HK1050800A1/xx

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/7103—Interference-related aspects the interference being multiple access interference

Definitions

  • the present invention relates to the technical field of cellular mobile communications, and in particular, to a method for measuring a signal-to-interference and noise ratio (SINR).
  • SINR signal-to-interference and noise ratio
  • SINR Signal to Interference plus Noise Ratio
  • Austin and Stuber proposed a method using training sequences for For SINR estimation algorithm, if no training sequence is used, its estimation accuracy depends on the symbol error characteristics.
  • the first three methods are too complicated and require a long training sequence. They are not suitable for fast power control and are difficult to apply in practical systems.
  • the fourth method seems simple, the premise of applying this method is that the parameters of the signal must be accurately estimated.
  • multi-user detection is required to accurately estimate the parameters of the signal, and this will greatly increase the complexity of the system.
  • a SINR measurement method proposed in WCDMA is to calculate the SINR measurement value by calculating the squared difference of the received signal.
  • the application of this method must have An important premise is that the mean value of the perturbation is zero. In WCDMA and IS-2000, this is achieved by performing pseudo-code spreading on each cell, so the application of this method has great limitations.
  • the present invention provides a method for measuring a signal-to-interference and noise ratio (SINR) applied to a cellular mobile communication system.
  • the method includes: transmitting different pilot symbols in a same subframe at a transmitting end, Interference has correlation, and fading also has correlation.
  • the SINR measurement value is obtained by computing the received different pilot symbols to eliminate interference.
  • 2N / K groups of 2N pilot symbols are sent, where K and N are positive integers. In this way, when K is 2, two different pilot symbols of the N group are transmitted.
  • K 2N, 2N different pilot symbols are transmitted for one group.
  • a total of 2N pilot symbols of different 2N / K groups are transmitted, where K and N are both positive integers. In this way, when K is 2, a total of 2N pilot symbols are transmitted for transmitting different N groups.
  • K is N, different 2 groups of 2N pilot symbols are transmitted.
  • the operation of receiving different pilot symbols on the receiving end to eliminate interference, and obtaining a SINR measurement value includes the following steps:
  • step a (b) averaging the subtraction calculation results in step a to further eliminate interference
  • step b square the sum of the calculation results in step b to obtain the signal energy
  • step (e) Divide the signal energy by the total energy of interference and noise to get the SINR measurement.
  • step (a) when the different pilot symbols are composed of two different pilot symbols as a group, and N groups of 2N pilot symbols are transmitted in total, the pair-to-serial conversion is performed.
  • Subtracting the adjacent different pilot symbols refers to calculating the difference between the pilot symbols of odd bits and the pilot symbols of adjacent even bits.
  • step (a) when the different pilot symbols refer to transmitting 2N different pilot symbols, the subtraction operation is performed on adjacent different pilot symbols after serial-parallel conversion. Refers to calculating the difference between the M-th pilot symbol and the M-1-th pilot symbol, where M is a positive even number less than or equal to 2N.
  • step (a) when the different pilot symbols are composed of two identical pilot symbols as a group, and different N groups of 2N pilot symbols are transmitted, the pair of strings Subtracting the adjacent different pilot symbols after conversion means calculating the difference between the odd-numbered adjacent pilot symbols and the even-numbered adjacent pilot symbols.
  • step (a) when the different pilot symbols refer to a group consisting of N identical pilot symbols, and different 2 groups of 2N pilot symbols are transmitted, the pair of strings Subtracting the adjacent different pilot symbols after conversion means calculating the difference between the Mth pilot symbol and the (N + M) th pilot symbol, where M is less than or equal to N Positive integer.
  • a measuring device for a signal-to-interference and noise ratio (SINR) applied to a cellular communication system includes a despread in-phase demodulation device, a despread quadrature demodulation device, a serial-to-parallel converter, and a subtractor.
  • An equalizer and an arithmetic unit wherein the received signals are despread and demodulated by a despread in-phase demodulation device and a despread quadrature demodulation device respectively; and the despread and demodulated signals are each performed by a serial-parallel converter.
  • Subtracter performs differential operation on adjacent different pilot symbols after serial-to-parallel conversion to eliminate perturbation; Divide the difference operation results by averager to average and further eliminate interference; The device calculates the total energy, calculates the sum of squares of the operation results of the equalizer, thereby obtaining the signal energy, further obtains the total energy of interference and noise, and divides the signal energy by the total energy of interference and noise to obtain the SINR measurement.
  • the SINR measurement method proposed by the present invention can effectively remove the influence of interference, and give accurate SINR measurement values under arbitrary interference conditions. At the same time, complex multi-user detection is avoided, the algorithm is simple and easy to implement, and has great application value in practical engineering. Brief description of the drawings
  • Figure 1 is a basic schematic block diagram of a wireless communication system.
  • Figure 2 is a schematic diagram of a frame structure.
  • FIG. 3 is a schematic diagram of an implementation example of four pilot symbol designs according to the present invention.
  • Fig. 4 is a block diagram of a measuring device according to the method of the present invention. Mode of Carrying Out the Invention
  • ⁇ ⁇ , ⁇ ⁇ respectively represent the signal received by the receiving device 105, the signal transmitted by the transmitting device 101, the fading factor of the fading channel 102, the interference signal 106 from the same cell and other cells at the kth sampling time, and White noise signal 107.
  • Pilot symbols are used to estimate SINR, signal, or channel parameters, and the estimation results of the pilot symbols are used as a reference for subsequent data symbols, and these estimation results remain unchanged within a frame.
  • the frame structure of the system is referred to FIG. 2 .
  • the core of the method of the invention lies in the design of the pilot structure.
  • the traditional pilot structure design all transmits the same pilot symbol, and the present invention transmits different pilot symbols in the same subframe.
  • the so-called difference may refer to different positions on the signal constellation diagram, and the constellation diagram The larger the distance, the better. It is best when the correlation characteristic value between two different pilot symbols is the smallest.
  • the interference between different pilot symbols in the same subframe is in the relevant area, and the fading is also in the relevant area.
  • FIG. 3 shows structural designs of several pilot symbols of the present invention.
  • the pilot symbols shown in (a) and (b) are composed of multiple sets of pilot symbols repeatedly, and the pilot symbols of each group are different from each other.
  • (A) shows that it consists of two different pilot symbols, P 2 Group, a total of N groups constitute 2N pilot symbols.
  • (B) it is shown by a group of 2N mutually different pilot symbols [rho]], ⁇ 2, ⁇ 3, ⁇ 4 ' ⁇ ⁇ 2 ⁇ - !, J3 ⁇ 4v composition.
  • the value of N should satisfy the interference and fading between different pilot symbols.
  • the pilot symbols shown in (c) and (d) are composed of multiple groups of pilot symbols, each group is composed of the same pilot symbol, and different pilot symbols are used between groups.
  • C shows two cadavers with the same pilot symbols respectively; and PN 2 with a corpse 2 , ⁇ — ⁇ 'PN- ⁇ P N P N ) P N , and a total of N groups constitute 2N pilot symbols , P], P 2 ,, ...: and are N pilot symbols different from each other.
  • (D) shows a group consisting of N identical pilot symbols and / ⁇ respectively, a total of 2 groups constituting 2N pilot symbols, and P / and P 2 are two different pilot symbols.
  • the value of N should also satisfy the interference and fading between different pilot symbols.
  • a total of 2N pilot symbols are set in a frame.
  • a signal is transmitted in an odd number of pilot symbols, and a signal is transmitted in an even number of pilot symbols. That is, the kth pilot symbol is:
  • the signal received by the receiving end is subjected to in-phase demodulation by the despreading and demodulation device 401, and output through the serial-to-parallel converter 403; quadrature demodulation is performed through the despreading and demodulation device 402, and serial and parallel
  • the output of the converter 404 is obtained as follows:
  • Arithmetic unit 405 is used to complete (7)-(9).
  • Equation (19) Since the pilot symbol is a known signal, sin () is a known signal. From Equation (19) we can find 4 The precise signal energy, the calculator 412 is used to accomplish this function. The formula (19) is divided by the constant term 4 S in 2 ( ⁇ ), because the value of n "is very small and can be ignored here. The obtained signal energy is:
  • E s a k 2 A k 2 (20)
  • the divider 413 can find the final SINR as: In the present invention, different pilot symbols with correlations between interference and fading are transmitted in the same subframe on the transmitting end, and the receiving end performs operations on the different pilot symbols to eliminate interference to obtain accurate SINR measurement .
  • SINR measurement technology By using the SINR measurement technology provided by the present invention, accurate SINR measurement values can be given in the case of multi-cell multi-user interference, avoiding complicated multi-user detection, and is a communication system suitable for cellular mobile communication or interference. Effective SINR measurement method.
  • the above is only described with a preferred embodiment of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall be included in the present invention. Within the scope of the claims.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

L'invention concerne un procédé pour mesurer le rapport signal-parasites plus bruit d'un système de télécommunication cellulaire mobile soumis à n'importe quels parasites. Ce procédé consiste à transmettre différents signaux pilotes dans la même sous-trame de l'extrémité d'émission, une corrélation existant entre les différents signaux pilotes et les parasites et l'évanouissement ; à traiter les différents signaux pilotes dans l'extrémité de réception pour éliminer les parasites de façon à obtenir la valeur de mesure du rapport signal-parasites plus bruit. Ce procédé permet d'éliminer les effets de parasites et donne une valeur exacte du rapport signal-parasites plus bruit dans des cas de parasites touchant plusieurs utilisateurs.
PCT/CN2000/000526 2000-11-29 2000-11-29 Procede pour mesurer le rapport signal-parasites plus bruit WO2002045447A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CNB008136319A CN1171489C (zh) 2000-11-29 2000-11-29 一种信号干扰比的测量方法
AU2001216906A AU2001216906A1 (en) 2000-11-29 2000-11-29 A method for measuring signal to interference plus noise ratio
PCT/CN2000/000526 WO2002045447A1 (fr) 2000-11-29 2000-11-29 Procede pour mesurer le rapport signal-parasites plus bruit
HK03102925A HK1050800A1 (en) 2000-11-29 2003-04-24 A method for measuring signal to interference plusnoise ratio.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2000/000526 WO2002045447A1 (fr) 2000-11-29 2000-11-29 Procede pour mesurer le rapport signal-parasites plus bruit

Publications (1)

Publication Number Publication Date
WO2002045447A1 true WO2002045447A1 (fr) 2002-06-06

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PCT/CN2000/000526 WO2002045447A1 (fr) 2000-11-29 2000-11-29 Procede pour mesurer le rapport signal-parasites plus bruit

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CN (1) CN1171489C (fr)
AU (1) AU2001216906A1 (fr)
HK (1) HK1050800A1 (fr)
WO (1) WO2002045447A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100355229C (zh) * 2005-06-27 2007-12-12 凯明信息科技股份有限公司 高速下行分组接入中基于信干噪比预测的链路自适应方法
CN102244878A (zh) * 2010-05-11 2011-11-16 中兴通讯股份有限公司 一种测量信干噪比的方法及终端

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100433579C (zh) * 2005-09-13 2008-11-12 浙江华立通信集团有限公司 Fdd模式的cdma系统中前向基本业务信道信号干扰比估计算法
CN101309239B (zh) * 2005-09-13 2011-09-14 浙江华立通信集团有限公司 Fdd模式的cdma系统中前向基本业务信道信号干扰比估计方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1129508A (zh) * 1994-06-06 1996-08-21 诺基亚电信公司 在移动通信系统中抗干扰的方法
CN1158068A (zh) * 1995-11-22 1997-08-27 索尼公司 检测导频信号和用户的方法和装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1129508A (zh) * 1994-06-06 1996-08-21 诺基亚电信公司 在移动通信系统中抗干扰的方法
CN1158068A (zh) * 1995-11-22 1997-08-27 索尼公司 检测导频信号和用户的方法和装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100355229C (zh) * 2005-06-27 2007-12-12 凯明信息科技股份有限公司 高速下行分组接入中基于信干噪比预测的链路自适应方法
CN102244878A (zh) * 2010-05-11 2011-11-16 中兴通讯股份有限公司 一种测量信干噪比的方法及终端

Also Published As

Publication number Publication date
HK1050800A1 (en) 2003-07-04
AU2001216906A1 (en) 2002-06-11
CN1385043A (zh) 2002-12-11
CN1171489C (zh) 2004-10-13

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