WO2011130994A1 - Procédé et dispositif d'estimation de canal multi-utilisateurs - Google Patents

Procédé et dispositif d'estimation de canal multi-utilisateurs Download PDF

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Publication number
WO2011130994A1
WO2011130994A1 PCT/CN2010/077714 CN2010077714W WO2011130994A1 WO 2011130994 A1 WO2011130994 A1 WO 2011130994A1 CN 2010077714 W CN2010077714 W CN 2010077714W WO 2011130994 A1 WO2011130994 A1 WO 2011130994A1
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WO
WIPO (PCT)
Prior art keywords
channel estimation
frequency domain
user
values
domain channel
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Application number
PCT/CN2010/077714
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English (en)
Chinese (zh)
Inventor
李萍
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中兴通讯股份有限公司
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Publication of WO2011130994A1 publication Critical patent/WO2011130994A1/fr

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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
    • H04L25/0204—Channel estimation of multiple channels
    • 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
    • H04L25/022—Channel estimation of frequency response
    • 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
    • H04L25/023—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols

Definitions

  • LTE Long Term Evolution
  • 3G third generation mobile communication system
  • SC-FDMA single-carrier frequency division multiplexing multiple access system
  • CP cyclic prefix
  • Orthogonal, and effective frequency domain equalization can be obtained on the receiver side, thereby reducing the peak-to-average power ratio of the transmitting terminal and reducing the size and cost of the terminal.
  • the wireless channel can cause distortion of the received signal, including amplitude, phase, and frequency.
  • the receiver In order to correctly resolve the start-end signal, the receiver must perform channel estimation.
  • the FDMA system is also called DFT-S-OFDM system, and a demodulation reference signal is designed for channel estimation in the transmitted signal.
  • the delay may not always be an integer multiple of the interval, which will result in leakage. Therefore, when the channel is post-processed to remove noise, excessive introduction of noise paths can degrade the receiver demodulation performance, and improper deletion of the useful signal path also degrades the demodulation performance of the receiver and loses system capacity.
  • a primary object of the present invention is to provide a multi-user channel estimation method and apparatus to solve at least one of the above problems.
  • a multi-user channel estimation method including: a receiver uses a received frequency domain pilot demodulation reference signal and a local frequency domain pilot demodulation reference signal to obtain Taking M frequency domain channel estimation values of the target user at the pilot position, M is the total number of pilot subcarriers; extracting R values from the M frequency domain channel estimation values, and using the extracted R values to M frequency
  • the domain channel estimation value is extended to obtain a frequency domain channel estimation value, where W is an integer multiple of the number of users er carried on the same time-frequency resource block, W is less than or equal to M; when the frequency domain channel estimation value is converted to Domain, obtains a time domain channel estimation value; uses the channel estimation window of the target user to perform noise reduction processing on the time domain channel estimation values, and obtains the M+R time domain channel estimation values after noise reduction;
  • a multi-user channel estimation apparatus including: a receiving module, configured to receive a frequency domain pilot demodulation reference signal; and a frequency domain estimation module, configured to use a frequency domain received by the receiving module
  • the pilot demodulation reference signal and the local frequency domain pilot demodulation reference signal obtain M frequency domain channel estimation values of the target user at the pilot position, where M is the total number of pilot subcarriers; and the spread spectrum module is used to R values are extracted from the M frequency-domain channel estimation values, and the M frequency-domain channel estimates are extended by using the extracted R values to obtain M+R frequency-domain channel estimates, where W is the same time-frequency resource block.
  • the frequency-time transform module is configured to transform the M+R frequency-domain channel estimates obtained by the spread spectrum module into the time domain to obtain M+R time-domain channel estimates; the noise cancellation module, The method uses the channel estimation window of the target user to perform noise reduction processing on the M+R time domain channel estimation values, and obtains the noise-reduced time domain channel estimation values; the time-frequency transform module is configured to reduce the noise after the M+ R time domain channel estimates are transformed to In the frequency domain, the M+R frequency domain channel estimation values after noise reduction are obtained; the extraction module is configured to extract channel estimation values on the effective subcarriers from the frequency domain channel estimation values after the noise reduction, and obtain a time domain drop. Channel estimation of the frequency domain pilot position of the noise.
  • the pilot channel estimation in the frequency domain is spread in the frequency domain according to the user number, and then transformed into the time domain, and the time domain channel estimation is performed. Elimination, then transform back to the frequency domain, extract the channel estimation value on the effective subcarrier, thereby realizing the channel estimation of the target user, especially the channel estimation of multiple users, the scheme can improve the detection probability of the signal path, and effectively reduce the false deletion signal The performance loss caused by the path improves the receiver demodulation performance.
  • FIG. 1 is a schematic structural diagram of a multi-user channel estimating apparatus according to Embodiment 1 of the present invention
  • 2 is a flowchart of a multi-user channel estimation method according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic structural diagram of a multi-user channel estimation apparatus according to Embodiment 2 of the present invention
  • FIG. 1 is a schematic structural diagram of a multi-user channel estimation apparatus according to Embodiment 1 of the present invention
  • 2 is a flowchart of a multi-user channel estimation method according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic structural diagram of a multi-user channel estimation apparatus according to Embodiment 2 of the present invention
  • FIG. 1 is a schematic structural diagram of a multi-user channel estimation apparatus according to Embodiment 1 of the present invention
  • 2 is a flowchart of a multi-user channel estimation method according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic structural diagram of
  • FIG. 1 is a schematic structural diagram of a multi-user channel estimation apparatus according to an embodiment of the present invention. The apparatus is located at a receiver side for performing channel estimation on a signal of a target user received by a receiver.
  • the device mainly includes: a receiving module 10, a frequency domain estimating module 20, a spreading module 30, a time-frequency transform module 40, a noise canceling module 50, a time-frequency transform module 60, and an extracting module 70.
  • the receiving module 10 is configured to receive a frequency domain pilot demodulation reference signal
  • the frequency domain estimation module 20 is configured to use the frequency domain pilot demodulation reference signal received by the receiving module 10 and the local frequency domain pilot demodulation signal.
  • the frequency-domain channel estimation value H ⁇ ik) of the pilot position is expanded by the spreading factor module 20 using the W values of the M H ⁇ ik), thereby realizing The user's channel estimation can effectively reduce the performance loss caused by the erroneous deletion of the signal path, thereby improving the demodulation performance of the receiver.
  • 2 is a flowchart of a multi-user channel estimation method according to Embodiment 1 of the present invention. The method mainly includes the following steps: step 4: S4 - Step 4: S208: Step S200, the frequency domain estimation module 20 uses a receiving module.
  • the frequency domain estimation module 20 may generate the frequency domain pilot demodulation reference signal Y ⁇ ik and the receiving end to generate the same local frequency domain pilot demodulation reference signal X RS (k) as the transmitting end, and calculate the frequency domain uplink.
  • the channel estimation value H ⁇ CA:) of the frequency position is:
  • Step 202 The spreading module 30 extracts R values from the M Hj k), and uses the extracted R values to extend the frequency domain channel estimation value H ⁇ i ⁇ ) to obtain M+R frequency domain channel estimation values.
  • the time-frequency transform module 40 can transform the ⁇ ⁇ (/) to the time using the inverse discrete Fourier transform.
  • Step S206 the noise cancellation module 50 performs noise reduction processing on the time domain channel estimation values/ ⁇ f ⁇ by using the channel estimation window of the target user, and obtains the M+R time domain channel estimation values h RS (n) after noise reduction.
  • the window length J w of the channel estimation window of the target user may be:
  • a discrete Fourier transform can be used to transform ⁇ «) into the frequency domain.
  • the spreading module 30 uses the W values in the H ⁇ ik to spread the frequency domain channel estimation value H ⁇ C of the pilot position, and the frequency-time conversion module 40 then The extended sequence is transformed into the time domain by the noise cancellation module 50 for noise reduction processing, and the time-frequency transform module 60 converts the channel estimation after the noise reduction into the frequency domain to obtain a noise reduction signal in the frequency domain.
  • FIG. 3 is a schematic structural diagram of a multi-user channel estimation apparatus according to the embodiment. As shown in FIG. 3, the multi-user channel estimation apparatus of this embodiment is different from the first embodiment in that, in this embodiment, The spread spectrum module 30 is composed of a grouping module 300, an extracting module 302, a flipping module 304, and a spread spectrum computing module 306.
  • the module 306 is configured to perform frequency domain expansion on H ⁇ CA:) according to the following formula to obtain H' - ⁇ .
  • the spread spectrum module 30 groups the M H ⁇ ks according to the number of users when spreading the frequency domain pilot estimation values, and then from the M/K_er The RIK user group is extracted from the group, so that the Hj k) for the spread spectrum can be guaranteed to be more in line with the actual situation, thereby improving the accuracy of the channel estimation.
  • the spread spectrum calculation module 306 expands the M frequency domain channel estimation values into M+R frequency domain channel estimation values in a backward spread manner, it is not limited to Therefore, in practical applications, the M carrier channel estimates may be forward-expanded to obtain M+R frequency i or channel estimation values by using the extracted R values, or may be extended forward and backward to obtain M+R frequency. i or channel estimate.
  • 4 is a flowchart of a multi-user channel estimation method according to Embodiment 2 of the present invention. As shown in FIG.
  • Step S401 the frequency domain estimation module 20 is configured according to the receiving module 10
  • the received frequency domain pilot demodulation reference signal s and the receiver generate the same local frequency domain pilot demodulation reference signal as the transmitting end
  • H RS (k) ⁇ -, ⁇ k ⁇ Ml
  • M 192;
  • A represents the number in the frequency domain, taking an integer.
  • the grouping module 300 groups the 192 pilot subcarriers according to the length 2 and divides them into 96 groups.
  • the extraction module 302 extracts the groups of the 96 groups of H ⁇ k) into the smallest unit, and extracts 24
  • Step S405 the flipping module 304 flips the extracted ext (t) to obtain ⁇ n (t)
  • Step S406 the spread spectrum calculation module 306 obtains according to ⁇ 2 (0 Spreading sequence
  • step S408 calculating the effective channel impulse response window length of the target user (ie, the window length of the channel estimation window) J W , the number of ring shifts
  • the sample estimation window of the target user is obtained, wherein the different values of the "high-level configuration parameters, through” can identify the starting point of the channel estimation window of different target users, and the CP is the length of the cyclic prefix (CP).
  • CP is the length of the cyclic prefix (CP).
  • / ⁇ takes 144
  • / ⁇ takes 512
  • the parameters related to the effective channel impulse response window length can be obtained through simulation or field actual environmental testing.
  • the noise cancellation module 50 filters out the window interference and noise h RS (ri) n ⁇ t,
  • the length of the spread spectrum is determined by the number of users, and M H ⁇ ( k ) is grouped and extracted by the number of users, thereby further ensuring the accuracy of channel estimation.
  • M + R is a power of 2, which is different from Embodiment 1 or Embodiment 2 in that, in this embodiment, the frequency-time transform module 40 uses an inverse fast Fourier. The transformation will ⁇ (/) ,
  • the fast Fourier transform can be used for channel estimation, which greatly reduces the computational complexity of the implementation, and therefore reduces the hardware cost.
  • the communication system to which the foregoing technical solutions provided by the embodiments of the present invention are applicable includes, but is not limited to, an SC-FDMA system and an OFDM system. From the above description, it can be seen that, in the embodiment of the present invention, the frequency of the reference symbol is demodulated.
  • the pilot channel estimation in the frequency domain is spread in the frequency domain, and then transformed into the time domain, and the interference and noise are eliminated in the time domain channel estimation, and then converted back to the frequency domain to extract the effective subcarriers.
  • the channel estimation value is used to realize multi-user channel estimation, which reduces the interference and noise impact on the target user.
  • the channel estimation is performed by the signal-based extension method, the performance of the erroneous deletion signal path is effectively reduced. loss Therefore, the demodulation performance of the receiver is improved.
  • the technical solution provided by the embodiment of the invention increases the system capacity and provides a reliable guarantee for the communication service quality.
  • the method can implement channel estimation simply and efficiently, and expands the manner.

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

Abstract

La présente invention concerne un procédé et un dispositif d'estimation de canal multi-utilisateurs. Le procédé comprend les étapes consistant à : obtenir, par un récepteur, M valeurs d'estimation de canal de domaine fréquentiel d'utilisateurs cibles à des emplacements pilotes en utilisant un signal de référence de démodulation pilote de domaine fréquentiel reçu et un signal de référence de démodulation pilote de domaine fréquentiel local ; extraire R valeurs à partir des M valeurs d'estimation de canal de domaine fréquentiel, et diffuser les M valeurs d'estimation de canal de domaine fréquentiel en utilisant les R valeurs extraites pour obtenir M+R valeurs d'estimation de canal de domaine fréquentiel ; transformer les M+R valeurs d'estimation de canal de domaine fréquentiel en domaine temporel pour obtenir M+R valeurs d'estimation de canal de domaine temporel ; effectuer un traitement de réduction du bruit sur les M+R valeurs d'estimation de canal de domaine temporel en utilisant une fenêtre d'estimation de canal des utilisateurs cibles pour obtenir M+R valeurs d'estimation de canal de domaine temporel à bruit réduit ; et transformer les M+R valeurs d'estimation de canal de domaine temporel à bruit réduit en domaine fréquentiel, et extraire des valeurs d'estimation de canal de sous-porteuses effectives à partir de celles-ci. L'utilisation de la présente invention peut améliorer les performances de démodulation du récepteur.
PCT/CN2010/077714 2010-04-23 2010-10-13 Procédé et dispositif d'estimation de canal multi-utilisateurs WO2011130994A1 (fr)

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CN104253771A (zh) * 2013-06-27 2014-12-31 富士通株式会社 多参数联合估计方法和装置

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CN103856974B (zh) * 2012-11-30 2017-08-08 展讯通信(天津)有限公司 通信终端及长期演进系统中小区测量的方法与装置
CN103856973B (zh) * 2012-11-30 2017-04-26 展讯通信(天津)有限公司 通信终端及长期演进系统中小区测量的方法与装置
CN103856419B (zh) * 2012-12-05 2017-06-06 上海贝尔股份有限公司 对至eNB的上行信道进行信道估计的方法与设备
CN103532885B (zh) * 2013-10-17 2017-01-04 北京锐安科技有限公司 一种用于多倍采样率数据流同时信道估计的方法
CN107508778B (zh) * 2017-08-03 2020-09-29 北京睿信丰科技有限公司 一种循环相关信道估计方法及装置
CN111404850B (zh) * 2020-03-23 2022-12-13 北京星网锐捷网络技术有限公司 一种基于5g系统的上行信道估计方法和装置
CN112787962B (zh) * 2020-12-28 2024-05-17 上海复旦通讯股份有限公司 基于导频参考信号的信道时域特征提取方法及系统
CN112866150B (zh) * 2021-01-13 2024-05-17 上海复旦通讯股份有限公司 一种无线信道特征提取与降维方法及系统
CN114745236A (zh) * 2022-04-07 2022-07-12 展讯通信（上海）有限公司 用于变换域信道估计的数据预处理方法及装置、通信设备

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