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Slicing noise estimation and elimination method and device based on compressed sensing

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

Active Publication Date: 2018-04-10
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Slicing noise estimation and elimination method and device based on compressed sensing
  • Slicing noise estimation and elimination method and device based on compressed sensing
  • Slicing noise estimation and elimination method and device based on compressed sensing

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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] 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

[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 of the position of the clipping noise, specifically:

[0049] Calculate the modulus of the sampling point of the received time-domain signal frame, and extract a plurality of sampling point positions with the largest modulus value as the prior infor...

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] 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

[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 position of the clipping noise, specifically:

[0082] Take the modulus value of the sampling points of the received time-domain signal frame, and use the positions of 3%*N sampling points with the largest modulus as the prior information of the clippi...

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Abstract

The present invention provides a method and device for estimating and eliminating clipping noise based on compressed sensing. The method includes: roughly estimating the position of the clipping noise according to the time-domain signal frame, so as to obtain the prior information of the location of the clipping noise; Perform discrete Fourier transform on the time-domain signal frame to obtain the frequency-domain observation sequence, and obtain the frequency-domain estimation sequence and noise estimation sequence according to the frequency-domain observation sequence, obtain the selection matrix according to the selection criterion, and obtain the observation vector and observation matrix; use the compressed sensing algorithm based on prior information to estimate the target vector to obtain the clipping noise sequence; subtract the clipping noise sequence from the currently received time domain signal frame to obtain the clipping noise signal signal frame. The embodiment of the present invention can accurately estimate the clipping noise in the OFDM system with relatively low complexity under the peak-limited channel, effectively expand the dynamic range of the signal, improve the quality of the received signal, and improve the robustness of the system.

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 terrestrial broadcasting (Digital Video Broadcasting-Terrestrial, DVB-T), and Chinese terrestrial digital TV transmission standard (DigitalTelevision Multimedi...

Claims

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Application Information

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