WO2013091155A1 - Procédé et dispositif d'estimation de décalage de fréquence porteuse - Google Patents

Procédé et dispositif d'estimation de décalage de fréquence porteuse Download PDF

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Publication number
WO2013091155A1
WO2013091155A1 PCT/CN2011/084198 CN2011084198W WO2013091155A1 WO 2013091155 A1 WO2013091155 A1 WO 2013091155A1 CN 2011084198 W CN2011084198 W CN 2011084198W WO 2013091155 A1 WO2013091155 A1 WO 2013091155A1
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WO
WIPO (PCT)
Prior art keywords
module
frame
estimation
cfo
synchronization
Prior art date
Application number
PCT/CN2011/084198
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English (en)
Chinese (zh)
Inventor
李焱
Original Assignee
中兴通讯股份有限公司
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 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to PCT/CN2011/084198 priority Critical patent/WO2013091155A1/fr
Priority to CN201180075419.8A priority patent/CN103988475B/zh
Publication of WO2013091155A1 publication Critical patent/WO2013091155A1/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
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a carrier frequency offset (CF0) estimation method and apparatus.
  • Background technique CF0
  • the CFO can seriously affect the performance of the receiver, so the initial CFO estimate is very important.
  • the correlation is usually performed by using the Primary Synchronization Signal (PSS), and the timing of 5 ms can be obtained.
  • PSS Primary Synchronization Signal
  • the frequency offset estimation can be performed by using an autocorrelation method, which is also a commonly used method in the OFDM system.
  • an autocorrelation method which is also a commonly used method in the OFDM system.
  • each subframe is composed of 14 OFDM symbols.
  • the correlation result on the majority of the OFDM symbols is noise, and the estimation performance is seriously degraded.
  • the main object of the present invention is to provide a CFO estimation method and apparatus, which can solve the problem of reduced CFO estimation performance when there is no downlink traffic scheduling.
  • a carrier frequency offset (CFO) estimation method comprising: Perform autocorrelation estimation and accumulation on the non-service downlink signals in the received downlink subframes according to different frame timings and CP modes, respectively;
  • the method further includes:
  • the user equipment UE performs frame synchronization on the received subframe according to different frame timings and CP modes;
  • the frame timing includes a 10 ms frame timing of a start position of a frame header of a radio frame when a primary synchronization sequence (PSS) position is known.
  • PSS primary synchronization sequence
  • the performing auto-correlation estimation on the non-service downlink signals in the received downlink subframes and accumulating is:
  • the results of the autocorrelation corresponding to the OFDM symbols are accumulated.
  • the non-service downlink signal includes one or more of a cell reference signal, a broadcast channel, a primary synchronization signal, and a secondary synchronization signal.
  • a CFO estimating device including a CFO estimating module, further comprising: an autocorrelation module, an accumulation module, and a selection module;
  • the auto-correlation module is configured to perform autocorrelation estimation on the non-service downlink signals in the received downlink subframes according to different frame timings and CP modes, respectively.
  • the accumulation module is configured to separately accumulate results of the autocorrelation estimation to obtain a cumulative result
  • the selection module is configured to compare the modulus values of the accumulation result, and select a cumulative result with a large modulus value to perform CFO estimation by the CFO estimation module. Further, the device further includes: a frame synchronization module and a judging module; wherein the frame synchronization module is configured to respectively perform frame synchronization on the received subframe according to different frame timings and CP modes;
  • the determining module is configured to determine whether the signal transmitted by the subframe after synchronization in different frame timings and CP modes is a non-service downlink signal.
  • the frame timing includes a 10 ms frame timing of a start position of a frame header of a radio frame when the PSS position of the main synchronization sequence is known.
  • the auto-correlation module is configured to perform autocorrelation with a CP of the OFDM symbol in the received non-service downlink signal and a corresponding part of the CP in the OFDM symbol.
  • the accumulation module is specifically configured to accumulate results of autocorrelation of corresponding OFDM symbols.
  • the non-service downlink signal includes one or more of a cell reference signal, a broadcast channel, a primary synchronization signal, and a secondary synchronization signal.
  • the CFO estimation is performed by using the non-service downlink signal in the downlink subframe, which can solve the problem that the CFO estimation performance is degraded when there is no downlink service scheduling, and can avoid affecting the subsequent secondary synchronization signal (Secondary Synchronization Signal, SSS) detection.
  • SSS Secondary Synchronization Signal
  • FIG. 1 is a schematic diagram showing an implementation flow of a CFO estimation method according to the present invention
  • FIG. 2 is a schematic diagram of selection of an OFDM symbol in a CFO estimation method according to the present invention
  • Fig. 3 is a schematic structural view of a CFO estimating apparatus of the present invention. detailed description
  • the basic idea of the present invention is: Since the detection of the CFO is after the PSS, the uplink and downlink configuration of the base station is unknown, at this time, the UE has only a half frame timing of 5 ms, and the 10 ms frame timing needs to be determined after the SSS detection; and some signals, such as Broadcast Broadcast Channel (PBCH) The transmission period is 10 ms, but the UE has not yet obtained the frame timing. Therefore, in order to make the best use of the available signals, it is also necessary to preset the frame timing to perform frame synchronization on the received subframes, and perform correlation and accumulation separately, and finally select a CFO estimation with a larger modulus value;
  • PBCH Broadcast Broadcast Channel
  • auto-correlation estimation and accumulation are performed on the non-service downlink signals in the received downlink subframes respectively; comparing the obtained modular values of the cumulative results, and selecting a cumulative result with a large modulus value to perform CFO estimation .
  • FIG. 1 shows an implementation flow of a CFO estimation method according to the present invention. As shown in FIG. 1, the method includes the following steps:
  • Step 101 Perform autocorrelation estimation and accumulation on the non-service downlink signals in the received downlink subframes according to different frame timings and CP modes.
  • the CP of the OFDM symbol in the non-service downlink signal in the received downlink subframe may be auto-correlated with the corresponding part of the CP in the OFDM symbol, where the CP is to copy a part of the OFDM symbol.
  • the non-service downlink signal includes one or more of a Cell-Specific Reference Signal (Cell RS), a Broadcast Broadcast Channel (PBCH), a PSS, and an SSS.
  • the method further includes: performing, by the UE, frame synchronization on the received subframe according to different frame timings and the CP mode, where the different frame timing includes a 5 ms half frame timing and a known primary synchronization sequence PSS.
  • Step 102 Compare the modulus values of the obtained cumulative results, and select a cumulative result with a large modulus value. CFO estimates.
  • Step 1 performing frame synchronization on the received subframes according to two frame timings, and selecting a signal from the correlation estimation;
  • the CP mode of OFDM includes normal CP (Normal CP) and extended CP (Extended CP). Therefore, it is necessary to simultaneously detect multiple possibilities. In each of the possible cases, it is determined whether the received OFDM symbol belongs to a downlink signal that must be transmitted, such as Cdl RS, PBCH, PSS, SSS or other non-traffic signals;
  • hy represents the OFDM symbol corresponding to different frame timings
  • Step 2 performing autocorrelation estimation and accumulation on the selected OFDM signal
  • Rxx'hy R xx ,h y + x sym hy (k)x sym hy (k) - x sym hy (k - n cp )x sym hy (k - n cp - n FFT )
  • ⁇ represents the received
  • the signal, n FFT , and ncp represent the number of samples of the OFDM symbol and the CP, respectively, and the correlation length is the number of CP points.
  • Step 3 Compare the cumulative results of the autocorrelation estimation results obtained at the above two frame timings, and select the cumulative result for which the CFO estimation is to be performed.
  • the selected cumulative result is calculated by the following formula, and the correct CFO estimation is obtained.
  • the specific process is basically the same as the existing CFO estimation, and will not be described again.
  • ⁇ is the time interval of the two sampling points for autocorrelation, here the length of the OFDM symbol.
  • the apparatus includes: a CFO estimating module 31, an autocorrelation module 32, an accumulating module 33, and a selecting module 34; wherein the autocorrelation module 32 And performing auto-correlation estimation on the non-service downlink signals in the received downlink subframes according to different frame timings and CP modes;
  • the accumulating module 33 is configured to accumulate results of the autocorrelation estimation respectively to obtain a cumulative result
  • the selection module 34 is configured to compare the modulus values of the accumulation result, and select a cumulative result with a large modulus value to be estimated by the CFO estimation module 31 for the CFO.
  • the device further includes: a frame synchronization module 35 and a judging module 36; wherein the frame synchronization module 35 is configured to respectively perform frame synchronization on the received subframe according to different frame timings and CP modes;
  • the determining module 36 is configured to determine whether the signal transmitted by the subframe after the synchronization of the frame timing and the CP mode is a non-service downlink signal, where the different frame timing includes a 5 ms half frame timing and is a known primary synchronization sequence. 10ms frame setting of the start position of the frame header of the radio frame at the PSS position Time.
  • the auto-correlation module 32 is configured to perform auto-correlation with a CP in an OFDM symbol in the received non-service downlink signal and a corresponding part of the CP in the OFDM symbol; Accumulating the results of the autocorrelation of the corresponding OFDM symbols;
  • the non-service downlink signal includes one or more of a cell reference signal, a broadcast channel, a primary synchronization signal, and a secondary synchronization signal.

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

Abstract

L'invention concerne un procédé d'estimation de décalage de fréquence porteuse (CFO). Le procédé consiste à : conformément à différents positionnements temporels de trame et différents modes CP, effectuer respectivement une estimation et une accumulation d'auto-pertinence sur un signal de liaison descendante non de service dans une sous-trame de liaison descendante reçue ; et comparer la valeur de module du résultat d'accumulation obtenu et sélectionner un résultat d'accumulation ayant une valeur de module plus grande afin d'effectuer une estimation de CFO. La présente invention utilise un signal de liaison descendante non de service dans une sous-trame de liaison descendante pour effectuer une estimation de CFO conformément aux caractéristiques d'un système LTE et peut résoudre le problème selon lequel les performances d'estimation de CFO sont réduites s'il n'existe pas de planification de service de liaison descendante et peut éviter d'affecter une détection SSS subséquente.
PCT/CN2011/084198 2011-12-19 2011-12-19 Procédé et dispositif d'estimation de décalage de fréquence porteuse WO2013091155A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2011/084198 WO2013091155A1 (fr) 2011-12-19 2011-12-19 Procédé et dispositif d'estimation de décalage de fréquence porteuse
CN201180075419.8A CN103988475B (zh) 2011-12-19 2011-12-19 一种载波频偏估计方法及装置

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Application Number Priority Date Filing Date Title
PCT/CN2011/084198 WO2013091155A1 (fr) 2011-12-19 2011-12-19 Procédé et dispositif d'estimation de décalage de fréquence porteuse

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WO2013091155A1 true WO2013091155A1 (fr) 2013-06-27

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Cited By (2)

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CN105933262A (zh) * 2016-05-23 2016-09-07 华信咨询设计研究院有限公司 基于双训练序列的cfo估计方法
WO2018103036A1 (fr) * 2016-12-05 2018-06-14 北京邮电大学 Procédé et dispositif d'estimation de décalage de fréquence doppler, ainsi que procédé et dispositif d'élimination de décalage de fréquence doppler dans un système ofdm

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CN105721378A (zh) * 2016-01-15 2016-06-29 华信咨询设计研究院有限公司 基于酉矩阵训练序列的cfo估计方法

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CN101022443A (zh) * 2007-03-26 2007-08-22 重庆邮电大学 基于异周期毗邻结构的ofdm频偏估计方法
CN101217525A (zh) * 2008-01-16 2008-07-09 中兴通讯股份有限公司 一种正交频分复用系统中实现下行帧同步的方法和装置
US20090103667A1 (en) * 2007-10-17 2009-04-23 Augusta Technology, Inc. Methods for Modified Signal Acquisition for OFDM Schemes

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US20050195888A1 (en) * 2004-03-05 2005-09-08 Wen-Sheng Hou Carrier frequency offset estimation in preambled systems
CN100444526C (zh) * 2004-06-28 2008-12-17 中兴通讯股份有限公司 一种频偏校正的方法和装置
CN102256298B (zh) * 2011-07-05 2014-03-26 展讯通信（上海）有限公司 移动终端及其同步方法

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CN101022443A (zh) * 2007-03-26 2007-08-22 重庆邮电大学 基于异周期毗邻结构的ofdm频偏估计方法
US20090103667A1 (en) * 2007-10-17 2009-04-23 Augusta Technology, Inc. Methods for Modified Signal Acquisition for OFDM Schemes
CN101217525A (zh) * 2008-01-16 2008-07-09 中兴通讯股份有限公司 一种正交频分复用系统中实现下行帧同步的方法和装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105933262A (zh) * 2016-05-23 2016-09-07 华信咨询设计研究院有限公司 基于双训练序列的cfo估计方法
CN105933262B (zh) * 2016-05-23 2018-12-14 华信咨询设计研究院有限公司 基于双训练序列的cfo估计方法
WO2018103036A1 (fr) * 2016-12-05 2018-06-14 北京邮电大学 Procédé et dispositif d'estimation de décalage de fréquence doppler, ainsi que procédé et dispositif d'élimination de décalage de fréquence doppler dans un système ofdm

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CN103988475A (zh) 2014-08-13
CN103988475B (zh) 2017-06-09

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