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Clipping noise estimation and elimination method based on compressive sensing and device thereof

A clipping noise and compressed sensing technology, which is applied in the field of digital signal transmission, can solve problems such as loss of spectral efficiency, reduction of computational complexity, and influence of algorithm effects, so as to expand the dynamic range, improve the quality of the received signal, and improve the robustness of the system Effect

Active Publication Date: 2015-09-23
TSINGHUA UNIV
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Problems solved by technology

[0005] The existing clipping noise estimation method based on compressed sensing uses pilot signals inserted into the OFDM frequency domain signal for estimation, but has the following disadvantages: On the one hand, according to the theory of compressed sensing, the existence of background noise has a significant impact on the algorithm effect, In the case of strong additive white Gaussian noise (AWGN), this method has to occupy a large number of subcarriers as pilot signals, resulting in a loss of spectral efficiency; on the other hand, the compressed sensing algorithm of this method starts from the initial state Iterative calculation, the number of iterations is large, and the computational complexity needs to be reduced urgently

Method used

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  • Clipping noise estimation and elimination method based on compressive sensing and device thereof
  • Clipping noise estimation and elimination method based on compressive sensing and device thereof
  • Clipping noise estimation and elimination method based on compressive sensing and device thereof

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Embodiment 1

[0046] This embodiment specifically discloses a method for estimating and restoring compressed sensing clipping noise based on prior information that can be applied in a CP-OFDM system (without considering virtual subcarriers), the method includes:

[0047] to combine figure 2 and image 3 , in this embodiment, the frame body of the transmitted signal frame is an OFDM data block, the number of OFDM subcarriers is N=128, the frame header is the cyclic prefix of the frame body OFDM data block, and the received time-domain signal frame body OFDM data block is denoted as { x ( n ) } n = 1 128 .

[0048] S101: Roughly estimate the position of the clipping noise according to the currently received time-domain signal frame, so as to obtain the prior information...

Embodiment 2

[0079] This embodiment specifically discloses a method for estimating and restoring compressed sensing clipping noise based on prior information that can be applied in a CP-OFDM system (considering virtual subcarriers), the method includes:

[0080] to combine figure 2 and image 3 , in this embodiment, the frame body of the transmitted signal frame is an OFDM data block, the number of OFDM subcarriers is N=128, the frame header is the cyclic prefix of the frame body OFDM data block, and the received time-domain signal frame body OFDM data block is denoted as { x ( n ) } n = 1 128 ;

[0081] S1: Roughly estimate the position of the clipping noise according to the currently received time-domain signal frame, so as to obtain the prior information of the po...

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Abstract

The invention provides a clipping noise estimation and elimination method based on compressive sensing and a device thereof. The method comprises the steps that coarse estimation is performed on the position of clipping noise according to time domain signal frames so that prior information of the position of clipping noise is obtained; discrete Fourier transform is performed on the time domain signal frames and a frequency domain observation sequence is obtained, a frequency domain estimation sequence and a noise estimation sequence are obtained according to the frequency domain observation sequence, a selection matrix is obtained according to choice criteria and an observation vector and an observation matrix are obtained according to the selection matrix; a target vector is estimated by adopting a compressive sensing algorithm based on prior information auxiliary so that a clipping noise sequence is obtained; and the clipping noise sequence is subtracted from the currently received time domain signal frames so that the signal frames after elimination of clipping noise signals can be obtained. According to the clipping noise estimation and elimination method based on compressive sensing, clipping noise in an OFDM system can be accurately estimated through relatively low complexity under a peak limited channel so that dynamic range of the signals can be effectively expanded, receiving signal quality can be enhanced and system robustness can be enhanced.

Description

technical field [0001] The invention relates to the technical field of digital signal transmission, in particular to a method and device for estimating and eliminating limiting noise based on compressed sensing. Background technique [0002] In high-speed data transmission, Orthogonal Frequency Division Multiplex (OFDM) technology is one of the best multi-carrier transmission schemes. OFDM technology has high spectral efficiency, flexible multiple access mode, low implementation complexity, and can well resist multipath channel interference. It has been applied in various digital signal transmission systems, such as the power line communication system standard of the International Telecommunications Union (International Telecommunications Union, ITU-T G.9960), Wireless Local Area Network (WLAN), European Digital Video Broadcasting-Terrestrial (DVB-T), and Chinese Terrestrial Digital Television Transmission Standard (Digital Television Multimedia Broadcast, DTMB), etc. . ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03H04L25/08H04L27/26
Inventor 杨昉高俊男宋健丁文伯
Owner TSINGHUA UNIV
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