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Compressed Sensing Channel Estimation Method Based on Joint Channel Coding and Decoding in OFDM System

A channel estimation and joint channel technology, applied in baseband system components, transmission systems, multi-frequency code systems, etc., can solve problems such as the improvement of compressed sensing recovery algorithms, achieve channel estimation accuracy and bit error rate performance improvement, and accelerate The effect of decoding speed

Active Publication Date: 2018-04-27
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] However, the traditional two-dimensional interpolation technology has the following defects: In actual wireless signal transmission, the dual-selective multipath channel is usually dominated by only a few main path clusters, so the physical channel presented is often sparse
However, this method is only a simple application of compressed sensing technology, and does not improve the compressed sensing recovery algorithm.

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  • Compressed Sensing Channel Estimation Method Based on Joint Channel Coding and Decoding in OFDM System
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  • Compressed Sensing Channel Estimation Method Based on Joint Channel Coding and Decoding in OFDM System

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing, the present invention will be further described:

[0034] The present invention mainly belongs to the receiving end, but in order to illustrate the performance of the present invention, it is necessary to add the sending end as a verification module to the description of the present invention, figure 1 The baseband data, channel coding (Turbo code), modulation and OFDM multiplexing, wireless channel simulation and other modules in the module all belong to the verification module, which is an existing mature technology and a technology well known to those skilled in the art.

[0035] figure 1 In the pilot insertion module, in terms of pilot patterns, since the compressed sensing technology is used to reduce the number of pilots, the insertion pattern of the pilots is pseudo-randomly inserted according to the compressed sensing theory. Compressed Sensing Channel Estimation Pseudo-Random Pilot Pattern Generation Algorithm", ...

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Abstract

The present invention claims to protect a compressed sensing channel estimation scheme based on joint channel coding and decoding in an OFDM system, including: pilot and CRC insertion steps, an improved compressed sensing channel estimation method, channel decoding and decision, analog coding modulation and Multiplexing and channel information calculation, wherein the improved compressed sensing channel estimation includes noise initial estimation, improved compressed sensing channel estimation, adaptive stopping condition calculation, and noise iterative estimation. Design a new pilot and CRC insertion scheme, adopt adaptive weighting technology, perform joint iterative processing of estimator and decoder, and estimate multipath channel information and signal-to-noise ratio without knowing the channel sparsity and signal-to-noise ratio ratio, and adopts CRC segmented decision feedback to speed up the iteration speed and accuracy at the same time. And increase the re-simulation of the data of the transmitting end at the receiving end, regard the correctly decoded information as a pilot, and compare it with the received data to obtain more accurate channel information and reduce the bit error rate at the same time.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, relates to mobile communication and channel estimation technology, and is suitable for sparse channel estimation and decoding under an OFDM system. Background technique [0002] Multi-carrier technology uses a series of orthogonal sub-carriers to realize high-speed data transmission. It is an efficient parallel data transmission scheme, among which Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) technology is the most widely used multi-carrier technology. . The main feature of OFDM is to divide high-speed serial data into multiple orthogonal sub-carriers for relatively low-speed parallel transmission. Due to the orthogonality between the sub-carriers, the frequency spectrum of the sub-channels is allowed to overlap with each other, so the OFDM spectrum utilization rate is higher. In addition, OFDM technology has strong anti-frequency ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L25/02H04L27/26
Inventor 余翔徐宇明段思睿郑寒冰吕世起
Owner CHONGQING UNIV OF POSTS & TELECOMM