WO2011071894A1 - Invention permettant un suivi de phase d'un dispositif de communication - Google Patents

Invention permettant un suivi de phase d'un dispositif de communication Download PDF

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Publication number
WO2011071894A1
WO2011071894A1 PCT/US2010/059250 US2010059250W WO2011071894A1 WO 2011071894 A1 WO2011071894 A1 WO 2011071894A1 US 2010059250 W US2010059250 W US 2010059250W WO 2011071894 A1 WO2011071894 A1 WO 2011071894A1
Authority
WO
WIPO (PCT)
Prior art keywords
communication device
pilot
symbols
pilot symbols
rank
Prior art date
Application number
PCT/US2010/059250
Other languages
English (en)
Inventor
Vincent Knowles Jones Iv
Hemanth Sampath
Didier Johannes Richard Van Nee
Original Assignee
Qualcomm Incorporated
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 Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to DK10795132.9T priority Critical patent/DK2510657T3/en
Priority to KR1020167004453A priority patent/KR101647811B1/ko
Priority to JP2012543200A priority patent/JP2013513340A/ja
Priority to CN201080055463.8A priority patent/CN102640469B/zh
Priority to ES10795132.9T priority patent/ES2554632T3/es
Priority to PL10795132T priority patent/PL2510657T3/pl
Priority to KR1020127017702A priority patent/KR101782033B1/ko
Priority to EP10795132.9A priority patent/EP2510657B1/fr
Publication of WO2011071894A1 publication Critical patent/WO2011071894A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2675—Pilot or known symbols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding

Definitions

  • the present disclosure relates generally to communication systems. More specifically, the present disclosure relates to enabling phase tracking for a communication device.
  • the plurality of pilot symbols may be received during a training period.
  • the training period may include Very High Throughput-Long Training Field (VHT-LTF) symbols transmitted according to Institute of Electrical and Electronics Engineers (IEEE) 802.1 lac specifications.
  • VHT-LTF Very High Throughput-Long Training Field
  • a computer-program product for tracking phase includes a non-transitory tangible computer-readable medium with instructions.
  • the instructions include code for causing a communication device to receive a plurality of pilot symbols from a sending communication device.
  • the pilot symbols conform to a rank-deficient pilot mapping matrix.
  • the instructions also include code for causing the communication device to determine a phase estimate based on the pilot symbols.
  • the instructions further include code for causing the communication device to estimate a channel based on the phase estimate and the pilot symbols.
  • the instructions additionally include code for causing the communication device to receive data from the sending communication device using the channel estimate.
  • Figure 4 is a flow diagram illustrating one configuration of a method for enabling phase tracking for a communication device
  • Figure 10 is a diagram illustrating another example of a rank-deficient pilot mapping matrix that may be used according to the systems and methods disclosed herein;
  • the term "base station” generally denotes a communication device that is capable of providing access to a communications network.
  • communications networks include, but are not limited to, a telephone network (e.g., a "land-line” network such as the Public-Switched Telephone Network (PSTN) or cellular phone network), the Internet, a Local Area Network (LAN), a Wide Area Network (WAN), a Metropolitan Area Network (MAN), etc.
  • PSTN Public-Switched Telephone Network
  • LAN Local Area Network
  • WAN Wide Area Network
  • MAN Metropolitan Area Network
  • Examples of a base station include cellular telephone base stations or nodes, access points, wireless gateways and wireless routers, for example.
  • a transmission using four spatial streams may use a pilot mapping matrix R as illustrated in Equation (2).
  • FIG. 1 is a block diagram illustrating one configuration of communication devices 102, 114 in which systems and methods for enabling phase tracking for a communication device may be implemented.
  • Examples of communication devices 102, 114 include a wireless communication device, base station, User Equipment (UE), station (STA), access terminal, access point, wireless router, desktop computer, laptop computer, smartphone, cellular phone, Personal Digital Assistant (PDA), tablet device, e-reader, gaming system, etc.
  • One or more "sending" communication devices 102 may include one or more antennas HOa-b used to communicate with a "receiving" communication device 114.
  • the symbol phase estimation module 118 may use rank-deficient pilot mapping matrix B 106b to track symbol phase during a training period.
  • the phase and/or frequency error reduction module 116 may use the tracked phase to compute a channel estimate with reduced phase and/or frequency errors that may be used to demodulate and/or decode received symbols 126.
  • the phase and/or frequency error reduction module 116 and/or the symbol phase estimation module 118 may be implemented in software, hardware or a combination of both.
  • the pilot symbol generation module 104 may generate pilot symbols that conform to a rank-deficient pilot mapping matrix 106.
  • the pilot symbol generation module 104 generates rank-deficient pilot mapping matrix A 106a.
  • the rank-deficient pilot mapping matrix A 106a may have a rank that is less than the number of spatial streams 124. For instance, assuming that there are four spatial streams 124a-d, rank-deficient pilot mapping matrix A 106a may be generated such that it is rank 2 or has rank 2.
  • the one or more sending communication devices 102 may send or transmit rank-deficient pilot mapping matrix A 106a to the receiving communication device 114.
  • the receiving communication device 114 may receive rank-deficient pilot mapping matrix A 106a as rank-deficient pilot mapping matrix B 106b.
  • a full rank pilot mapping matrix would allow the receiving communication device 114 to estimate a phase offset for each spatial stream 124.
  • the full rank pilot mapping matrix may not allow the receiving communication device 114 to estimate the phase offset during a training period (e.g., during a sequence of pilot symbols or pilot mapping matrix).
  • a pilot mapping matrix may comprise a sequence of pilot symbols over a training period for a number of spatial streams 124.
  • the training period comprises a sequence of four pilot symbols.
  • FIG. 2 is a diagram illustrating an example of a training period and/or channel estimation period 444.
  • a training period 444 may be a range of time 446 in which several training symbols are received.
  • the training period 444 may comprise Very High Throughput-Long Training Field (VHT-LTF) symbols transmitted according to Institute of Electrical and Electronics Engineers (IEEE) 802.1 lac specifications.
  • VHT-LTF Very High Throughput-Long Training Field
  • a channel estimate may be generated during the training and/or channel estimation 444 period.
  • the symbols received during the training period 444 may be long training symbols or comprise Long Training Fields (LTFs), for example.
  • a set of symbols for multiple spatial streams may be received by a receiving communication device 1 14 at each symbol receipt 448.
  • the receiving communication device 1 14 may be able to determine a phase estimate during the training and/or channel estimation period 444 for use in determining a channel estimate.
  • the pilot mapping matrix 106 comprised of the sets of pilot symbols received at symbol receipt A 448a, B 448b, C 448c and D 448d may be a rank- deficient pilot mapping matrix 106.
  • the number of pilot sequences that have a non-zero singular value (e.g., eigenvalue) or that are linearly independent is fewer than the number of spatial streams.
  • the rank-deficient pilot mapping matrix 106 may include one or more repeated sets of the same (e.g., identical) pilot symbols.
  • the number of OFDM pilot symbol sequences generated 702 that have non-zero singular values (e.g., eigenvalues) or the number of OFDM pilot symbol sequences generated 702 that are linearly independent are fewer than the number of spatial streams 124.
  • a sequence of pilot symbols (e.g., OFDM pilot symbols) may correspond to a row in the rank-deficient pilot mapping matrix 106.
  • the receiving communication device 114 may determine a correlation (e.g., cross-correlation) or phase differential of the original and repeated pilot symbols to determine 806 the phase estimate.
  • the receiving communication device 114 may determine a correlation (e.g., cross-correlation) or phase differential between the 1 st and 3 rd pilot symbols (e.g., 1 st and 3 rd sets or columns) and between the 2 nd and 4 th pilot symbols (e.g., 2 nd and 4 th sets or columns) to determine 806 one or more phase estimates.
  • the number of rows e.g., sequences of OFDM pilot symbols
  • non-zero singular values e.g., eigenvalues
  • linearly independent may be less than the number of spatial streams or columns, indicating a pilot mapping matrix that is rank-deficient or less than full rank.
  • the base station 114 may estimate 908 a channel based on the one or more phase estimates. For example, the base station 114 may use the one or more phase estimates to obtain a channel estimate.
  • the channel estimate may be more accurate (e.g., with reduced phase and/or frequency offsets), since it is based on the one or more phase estimates that may be more accurate (e.g., with reduced phase and/or frequency offsets).
  • the one or more phase estimates may be more accurate since they were determined during or based on symbols received during a training period 444.
  • the base station 114 may receive 910 data from the one or more wireless communication devices 102, using the channel estimate to demodulate and/or decode received symbols (e.g., data symbols).
  • the full rank pilot mapping matrix 1054 may allow a receiving communication device (e.g., base station, access point, etc.) to compute a phase (e.g., phase offset) for all of the spatial streams (corresponding to the pilot symbol sequences 1056a-d). Because each of the pilot symbol sets 1058a-d are different, however, one pilot symbol set 1058 cannot be easily compared to another pilot symbol set 1058 in order to determine a phase drift or phase estimate during the training period 444.
  • a receiving communication device e.g., base station, access point, etc.
  • a phase e.g., phase offset
  • a receiving communication device 114 may use pairs (or multiples, for example) of identical pilot symbols 1166 to determine one or more phase estimates. For example, the receiving communication device 114 may use the pair of identical pilot symbols A 1166a to determine one or more phase estimates. More specifically, the receiving communication device 114 may determine a correlation (e.g., cross- correlation) or phase differential between pilot symbol set A 1164a and pilot symbol set C 1164c to determine a phase estimate. The receiving communication device 114 may also determine a correlation (e.g., cross-correlation) or phase differential between pilot symbol set B 1164b and pilot symbol set C 1164c (e.g., identical pilot symbols B 1166b) to determine one or more phase estimates.
  • a correlation e.g., cross-correlation
  • pilot symbol set B 1164b and pilot symbol set C 1164c e.g., identical pilot symbols B 1166b
  • the phase of the repeated pilot symbols may be compared to the phase of the original pilot symbols (using correlation or a phase differential, for example) in order to determine a phase estimate.
  • a receiving communication device 114 may not determine a phase (e.g., phase offset) for all of the spatial streams (corresponding to the pilot symbol sequences 1162a- d).
  • the rank-deficient pilot mapping matrix 1160 illustrated in Figure 9 is rank 2, and thus only two independent phase estimates may be determined (instead of four for a full rank pilot mapping matrix 1054, for example).
  • pilot symbol sets A 1264a and E 1264e, B 1264b and F 1264f, C 1264c and G 1264g and D 1264d and H 1264h are respectively pairs of identical pilot symbols A 1266a, B 1266b, C 1266c and D 1266d.

Abstract

Cette invention se rapporte à un dispositif de communication destiné à permettre un suivi de phase. Le dispositif de communication comprend un processeur et des instructions stockées dans une mémoire. Le dispositif de communication génère une pluralité de symboles pilotes. Les symboles pilotes se conforment à une matrice de mappage pilote déficiente en rang. Le dispositif de communication émet également la pluralité de symboles pilotes.
PCT/US2010/059250 2009-12-07 2010-12-07 Invention permettant un suivi de phase d'un dispositif de communication WO2011071894A1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
DK10795132.9T DK2510657T3 (en) 2009-12-07 2010-12-07 PHASE TRACKING FOR A COMMUNICATION DEVICE
KR1020167004453A KR101647811B1 (ko) 2009-12-07 2010-12-07 통신 디바이스에 대한 위상 트래킹의 인에이블
JP2012543200A JP2013513340A (ja) 2009-12-07 2010-12-07 通信デバイスのための位相トラッキングを可能にすること
CN201080055463.8A CN102640469B (zh) 2009-12-07 2010-12-07 用于使能相位跟踪的通信设备、方法和装置
ES10795132.9T ES2554632T3 (es) 2009-12-07 2010-12-07 Seguimiento de fase para un dispositivo de comunicación
PL10795132T PL2510657T3 (pl) 2009-12-07 2010-12-07 Śledzenie fazy dla urządzenia telekomunikacyjnego
KR1020127017702A KR101782033B1 (ko) 2009-12-07 2010-12-07 위상 추적을 가능하게 하기 위한 통신 디바이스, 방법 및 장치, 위상을 추적하기 위한 통신 디바이스, 방법 및 장치, 그리고 컴퓨터 판독가능 매체
EP10795132.9A EP2510657B1 (fr) 2009-12-07 2010-12-07 Suivi de phase pour un dispositif de communication

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US26730009P 2009-12-07 2009-12-07
US61/267,300 2009-12-07
US12/961,000 2010-12-06
US12/961,000 US9288096B2 (en) 2009-12-07 2010-12-06 Enabling phase tracking for a communication device

Publications (1)

Publication Number Publication Date
WO2011071894A1 true WO2011071894A1 (fr) 2011-06-16

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Country Status (12)

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US (2) US9288096B2 (fr)
EP (2) EP2961119A1 (fr)
JP (2) JP2013513340A (fr)
KR (2) KR101782033B1 (fr)
CN (1) CN102640469B (fr)
DK (1) DK2510657T3 (fr)
ES (1) ES2554632T3 (fr)
HU (1) HUE025760T2 (fr)
PL (1) PL2510657T3 (fr)
PT (1) PT2510657E (fr)
TW (1) TWI478523B (fr)
WO (1) WO2011071894A1 (fr)

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US20160197710A1 (en) 2016-07-07
US9288096B2 (en) 2016-03-15
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US10057026B2 (en) 2018-08-21
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