WO2002049301A1 - Procede d'estimation de voies - Google Patents

Procede d'estimation de voies Download PDF

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Publication number
WO2002049301A1
WO2002049301A1 PCT/CN2000/000576 CN0000576W WO0249301A1 WO 2002049301 A1 WO2002049301 A1 WO 2002049301A1 CN 0000576 W CN0000576 W CN 0000576W WO 0249301 A1 WO0249301 A1 WO 0249301A1
Authority
WO
WIPO (PCT)
Prior art keywords
pilot symbols
different
serial
channel estimation
channel
Prior art date
Application number
PCT/CN2000/000576
Other languages
English (en)
Chinese (zh)
Inventor
Michael 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 AU2001221413A priority Critical patent/AU2001221413A1/en
Priority to PCT/CN2000/000576 priority patent/WO2002049301A1/fr
Priority to CNB008136033A priority patent/CN1152537C/zh
Publication of WO2002049301A1 publication Critical patent/WO2002049301A1/fr
Priority to HK03102926A priority patent/HK1050783A1/xx

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Classifications

    • 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

Definitions

  • the present invention relates to a cellular mobile communication system, and in particular, to a channel estimation method for effectively reducing or eliminating interference in a cellular mobile communication system.
  • channel estimation techniques are usually used.
  • Estimation for the specific scheme of Qualcomm continuous pilot, please refer to the Physical Layer Standard for ANSI / TIA / EIA-95-B; for the joint pilot channel estimation scheme in WCDMA, please refer to 3GPP TS25.211). Since these channel estimation methods are estimates with interference, multi-user detection must be performed; otherwise, accurate channel estimation results will not be given, which will affect the performance of the communication system. However, multi-user detection has greatly increased the complexity of the system. Summary of the Invention
  • the present invention provides a channel estimation method applied to a cellular mobile communication system.
  • a channel estimation method applied to a cellular mobile communication system.
  • the influence of interference can still be effectively eliminated, and an accurate channel estimation result is given. .
  • different pilot symbols are transmitted in the same subframe at the transmitting end.
  • the interference between the different pilot symbols is correlated and the fading is also correlated.
  • the receiving end performs the following steps: (a) performing despreading, in-phase demodulation, and serial-to-parallel conversion and despreading, orthogonal demodulation, and serial-to-parallel conversion on the received different pilot symbols;
  • step b Divide the calculation result obtained in step b to obtain an estimated value of the channel phase offset; sum the squared result of the calculation result in step b to obtain an estimated value of the channel amplitude fading.
  • the different pilot symbols may be composed of K different pilot symbols as a group, and 2N / K groups of 2N pilot symbols are transmitted, where K and N are both positive integers.
  • the subtraction operation of adjacent different pilot symbols after serial-parallel conversion described in step b refers to calculating the odd number of pilot symbols and the adjacent ones. Difference between even-bit pilot symbols.
  • the subtraction operation of the adjacent different pilot symbols after serial-parallel conversion described in step b refers to calculating the M-th pilot symbol and The difference between the M-th bit of the 1st pilot symbol, where M is a positive even number less than or equal to 2N.
  • the different pilot symbols may also be composed of K identical pilot symbols as a group, and a total of 2N pilot symbols of different 2N / K groups are transmitted, where, N Both are positive integers.
  • the subtraction operation of adjacent different pilot symbols after serial-parallel conversion as described in step b refers to the calculation of odd-numbered adjacent pilots.
  • the subtraction operation of adjacent different pilot symbols after serial-parallel conversion described in step 3 ⁇ 4 13 refers to calculating the M-th pilot The difference between the sign and the (N + M) -th pilot symbol, where M is less than or equal to A positive integer of N.
  • a channel estimation device applied to a cellular communication system includes a despread in-phase demodulation device, a despread quadrature demodulation device, a serial-to-parallel converter, a subtracter, an equalizer, a divider, and a squarer. And operator.
  • the received signals are despread and demodulated by a despread in-phase demodulation device and a despread quadrature demodulation device; the despread and demodulated signals are each serial-to-parallel converted by a serial-to-parallel converter; and subtractors are used respectively.
  • a division operation is performed to obtain an estimated phase offset of the channel;
  • a square sum operation is performed on the output of the equalizer in a square sum operator to obtain an estimated value of the amplitude fading of the channel.
  • the channel estimation method of the present invention transmits different forms of pilot symbols with correlation between interference and fading at the transmitting end, and eliminates interference by performing operations on adjacent pilot forms with different types of pilot symbols at the receiving end to enable multi-cell Under conditions such as interference, without the use of multi-user detection, the influence of interference can still be effectively eliminated, and accurate channel parameter estimation information is given to reduce the complexity of the system.
  • 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 schematic block diagram of a channel estimation device according to the method of the present invention. Mode of Carrying Out the Invention
  • r t , ⁇ , / A. 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, and the interference signal from the same cell and other cells at the k-th sampling time. 106, and the white noise signal 107.
  • Signal or channel parameters are estimated through pilot symbols, 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 shown in FIG. 2.
  • the core of implementing the method of the present 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 a group consisting of 2 different pilot symbols, P 2 , and a total of N groups forming 2 N 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 that two identical pilot symbols and ⁇ , P 2 and P 2 , ⁇ P ⁇ - ⁇ and P N- !, P N and PN respectively, and share N groups constitute 2N pilot symbols, P 2 , ⁇ P N is! ⁇ Mutually different pilot symbols.
  • (D) shows a group consisting of N identical pilot symbols P 7 and A respectively, a total of 2 groups constituting 2 N pilot symbols, and 2 are two different pilots. Frequency symbol.
  • 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, and a signal is transmitted in the odd-numbered pilot symbols.
  • a signal is transmitted in the even-numbered pilot symbols, that is, the k-th pilot symbol is:
  • the signal received by the receiving end is subjected to in-phase demodulation through the despreading and demodulation device 401 and output through the serial-to-parallel converter 403; Alternate demodulation, through the output of the serial-to-parallel converter 404, the following signals are obtained:
  • Arithmetic unit 405 is used to complete (7)-(9).
  • n k , n k are all Gaussian white noise with zero mean.
  • the equalizers 407 and 408 average the expressions (11) and (12), respectively. Since there are 2N pilot symbols in total, through the above derivation process, the subtraction operation is performed between adjacent pilot symbols.
  • the divider 410 is used to perform the operations of formulas (17) / (18), and obtains:

Landscapes

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

Abstract

L'invention porte sur un procédé d'estimation de voies utilisé avec un système de communication mobile cellulaire. Ledit système transmet différents symboles pilotes ayant une corrélation en terme de parasite et d'évanouissement sur la même sous-trame au niveau de l'émetteur d'une part, et d'autre part, il effectue un calcul différentiel au niveau du récepteur grâce aux symboles pilotes adjacents reçus et ce, afin d'éliminer toute interférence et de garantir une estimation des voies précise. Grâce à ce procédé d'estimation des voies, il est possible, dans des conditions d'interférence affectant de multiples abonnés sur de multiples couvertures, d'éliminer efficacement l'influence de ces interférences, de garantir une valeur d'estimation des voies précises, d'éviter la détection de multi-utilisateurs complexes et de réduire la complexité du système.
PCT/CN2000/000576 2000-12-14 2000-12-14 Procede d'estimation de voies WO2002049301A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU2001221413A AU2001221413A1 (en) 2000-12-14 2000-12-14 A channel estimating method
PCT/CN2000/000576 WO2002049301A1 (fr) 2000-12-14 2000-12-14 Procede d'estimation de voies
CNB008136033A CN1152537C (zh) 2000-12-14 2000-12-14 信道估计方法及装置
HK03102926A HK1050783A1 (en) 2000-12-14 2003-04-24 A channel estimating method and equipment.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2000/000576 WO2002049301A1 (fr) 2000-12-14 2000-12-14 Procede d'estimation de voies

Publications (1)

Publication Number Publication Date
WO2002049301A1 true WO2002049301A1 (fr) 2002-06-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2000/000576 WO2002049301A1 (fr) 2000-12-14 2000-12-14 Procede d'estimation de voies

Country Status (4)

Country Link
CN (1) CN1152537C (fr)
AU (1) AU2001221413A1 (fr)
HK (1) HK1050783A1 (fr)
WO (1) WO2002049301A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101505495A (zh) * 2008-02-05 2009-08-12 夏普株式会社 上行频分复用蜂窝通信系统干扰协调方法及基站
CN113518048A (zh) * 2020-04-10 2021-10-19 华为技术有限公司 一种信道参数计算方法及系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1253433A (zh) * 1998-11-02 2000-05-17 日本电气株式会社 信道特性推测装置
WO2000060762A1 (fr) * 1999-04-08 2000-10-12 Qualcomm Incorporated Estimation de voie dans un systeme de communication sans fil amdc
EP1047233A2 (fr) * 1999-04-23 2000-10-25 Lucent Technologies Inc. Estimation itérative de canal, et compensation basé sur celle-ci

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1253433A (zh) * 1998-11-02 2000-05-17 日本电气株式会社 信道特性推测装置
WO2000060762A1 (fr) * 1999-04-08 2000-10-12 Qualcomm Incorporated Estimation de voie dans un systeme de communication sans fil amdc
EP1047233A2 (fr) * 1999-04-23 2000-10-25 Lucent Technologies Inc. Estimation itérative de canal, et compensation basé sur celle-ci

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101505495A (zh) * 2008-02-05 2009-08-12 夏普株式会社 上行频分复用蜂窝通信系统干扰协调方法及基站
CN113518048A (zh) * 2020-04-10 2021-10-19 华为技术有限公司 一种信道参数计算方法及系统
CN113518048B (zh) * 2020-04-10 2022-06-14 华为技术有限公司 一种信道参数计算方法及装置

Also Published As

Publication number Publication date
CN1152537C (zh) 2004-06-02
HK1050783A1 (en) 2003-07-04
CN1385017A (zh) 2002-12-11
AU2001221413A1 (en) 2002-06-24

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