A method and device for time-frequency joint channel estimation based on compressed sensing

A compressed sensing and time-frequency combination technology, applied in the field of communication, can solve the problems of high complexity of interference cancellation, performance degradation, and low estimation accuracy, and achieve the goal of improving system spectrum utilization, reducing complexity and improving channel estimation accuracy. Effect

Active Publication Date: 2016-10-12
TSINGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the channel estimation method of the traditional TDS-OFDM system has low estimation accuracy, high complexity of interference elimination, and performance drops significantly under long delay conditions

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  • A method and device for time-frequency joint channel estimation based on compressed sensing
  • A method and device for time-frequency joint channel estimation based on compressed sensing
  • A method and device for time-frequency joint channel estimation based on compressed sensing

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Embodiment 1

[0052] This embodiment specifically discloses a method for compressive sensing-based time-frequency joint channel estimation applied to an improved single-PN TDS-OFDM system, the method comprising:

[0053] S1. Perform an initial estimation of the channel impulse response of the current signal frame, and obtain rough estimation information of the channel impulse response;

[0054] Wherein, the signal frame includes a frame header and a frame body, such as figure 2 As shown, wherein, the frame header is a section of training sequence, the length is M, M=255 in the present embodiment, and described training sequence uses Indicates that the frame body is a time-domain OFDM data block with a length of N. In this embodiment, N=3780, and the training sequence is the inverse discrete Fourier transform of the pseudo-random PN sequence in the frequency domain.

[0055] Wherein, the time-domain OFDM data block is obtained by performing N-point discrete Fourier inverse transform on a ...

Embodiment 2

[0083] This embodiment discloses a method for time-frequency joint channel estimation based on compressed sensing, the method includes:

[0084] S1. Perform an initial estimation of the channel impulse response of the current signal frame, and obtain rough estimation information of the channel impulse response;

[0085] Wherein, the signal frame includes a frame header and a frame body, such as figure 2 As shown, wherein, the frame header is a section of training sequence, the length is M, M=595 in the present embodiment, and described training sequence uses Indicates that the frame body is a time-domain OFDM data block with a length of N. In this embodiment, N=3780, and the training sequence is a time-domain pseudo-random PN sequence.

[0086] The number L=50 of the known pilots in this embodiment, the pilots are randomly inserted into the frequency domain subcarriers of the OFDM data block, wherein the value of the kth pilot is denoted as P(k), and the position is denoted...

Embodiment 3

[0110] This embodiment discloses a method for time-frequency joint channel estimation based on compressed sensing, the method includes:

[0111] S1. Perform an initial estimation of the channel impulse response of the current signal frame, and obtain rough estimation information of the channel impulse response;

[0112] Wherein, the signal frame includes a frame header and a frame body, such as figure 2 As shown, wherein, the frame header is a section of training sequence, the length is M, M=595 in the present embodiment, and described training sequence uses Indicates that the frame body is a time-domain OFDM data block with a length of N. In this embodiment, N=3780, and the training sequence is the inverse discrete Fourier transform of the pseudo-random PN sequence in the frequency domain.

[0113] Wherein, the time-domain OFDM data block is obtained by performing N-point discrete Fourier inverse transform on a frequency-domain OFDM data block with a length of N, wherein, ...

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Abstract

The invention discloses a time-frequency joint channel estimation method and device based on compressed sensing. The method includes the steps that S1, initial estimation of channel impulse response is conducted on a current signal frame, and coarse estimation information of the channel impulse response is acquired; S2, loop restructuring of OFDM block data is conducted on the current signal frame, and the reconstructed OFDM block data are obtained; S3, compressed sensing is carried out through pilot frequency information in the reconstructed OFDM block data according to the acquired coarse estimation information of the channel impulse response in the step S1, so that precise estimation information of the channel impulse response is acquired, and the precise estimation information is used as an estimation result of the channel impulse response of the current signal frame. By means of the method, maximum multipath time delay length resistance of a block transmission system, channel estimation precision and system spectrum efficiency can be improved, and under the condition that the maximum multipath time relay exceeds guard intervals, good channel estimation performance can still be achieved.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a method and device for time-frequency joint channel estimation based on compressed sensing. Background technique [0002] For the block transmission system in wireless communication, there is a non-negligible IBI (Inter Block Interference, inter-block interference) between time-domain data blocks under a large delay extension channel. In a block transmission system using OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing), an effective method against IBI is to fill GI (Guard Interval, Guard Interval) between time-domain OFDM data blocks. Under the condition that the maximum multipath delay of the channel does not exceed the GI length, there will be no interference between time-domain OFDM data blocks. [0003] According to the content of GI filling, there are many kinds of GI filling technologies. The method based on P...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H04L25/02
Inventor杨昉丁文伯宋健潘长勇
OwnerTSINGHUA UNIV