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Iteration demodulation decoding method of encoded modulation signals based on climax frequency deviation compensation

A technology of frequency offset compensation and coding modulation, applied in the field of wireless and satellite communication

Inactive Publication Date: 2010-10-06
PLA UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Due to the particularity of communication under extremely low signal-to-noise ratio, traditional algorithms are no longer used

Method used

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  • Iteration demodulation decoding method of encoded modulation signals based on climax frequency deviation compensation
  • Iteration demodulation decoding method of encoded modulation signals based on climax frequency deviation compensation
  • Iteration demodulation decoding method of encoded modulation signals based on climax frequency deviation compensation

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Embodiment Construction

[0120] In this example, the regular (3,6)-LDPC code with a code rate of 1 / 2 is selected, and the code length is L=4096. The number of initial data sub-blocks of the encoded codeword is B=128, the size of the initial data sub-block is D=32 and the preambles are distributed in each initial sub-block, and the number of preambles in each sub-block is P=1. B l =min(2 7-l , 128), D l =min(2 l D, 4096), where min(x, y) represents the smallest number among the numbers x and y. N l =D l +min(2 l +1, 128+1). In the modified M&M frequency offset estimation algorithm, the segment accumulation length is F=32, and the parameter E=32.

[0121] The iterative demodulation and decoding method proposed by the present invention is as follows: receive a complete frame of a coded modulation signal, and cut it into multiple signal sub-blocks; initialize the external information of the coded bits; For signal sample values, a modified M&M algorithm is used for frequency offset estimation; car...

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Abstract

The invention relates to an iteration demodulation decoding method of encoded modulation signals based on climax frequency deviation compensation, effectively solving the problem of iteration demodulation decoding of an LDPC (Low Density Parity Check Codes) encoded BPSK (Binary Phase Shift Keying) modulation system under frequency deviation and an unknown-phase channel. The method comprises the following steps of: receiving one frame of a full frame of encoded modulation signals, and dividing the full frame into a plurality of signal subblocks; initializing the external information of encodedbits; carrying out frequency deviation estimation by adopting a revised M&M arithmetic according to the external information of the encoded bits and the sample value of the received one-frame signals; carrying out a Tikhonov demodulation arithmetic to complete signal demodulation according to the structure of the signal subblocks and the frequency deviation estimation, and outputting a demodulation soft value of the encoded bits; receiving the demodulation soft value by a decoder, completing decoding once according to a confidence coefficient transmission decoding arithmetic, and outputting the external information of the encoded bits; and outputting a decoded value when the iteration demodulation times reach the preset times, and otherwise, increasing the length of the signal subblocks and repeating the operation until decoding is successful or iteration times achieve the regulated value.

Description

technical field [0001] The invention relates to the technical field of wireless and satellite communication, in particular to an iterative demodulation and decoding method and device for coded and modulated signals under extremely low signal-to-noise ratio. Background technique [0002] In wireless and satellite communication systems, transmitted bits are affected by random noise in the channel and generate random errors. It has been proved by theory and practice that the error-correcting coding method, which provides transmission reliability by introducing redundancy, is a kind of effective means. The Turbo codes and LDPC codes introduced in recent years are one of the coding schemes with the strongest error correction ability found so far. [0003] Turbo codes were proposed by C.Berrou et al. in 1993 [C.Berrou, A.Glavieux, and P.Thitimajshima, "Near Shannon limit error-correcting coding and decoding: Turbo-codes," in ICC'93, Geneva, Switcherland, May, 1993, pp.1064-1070]...

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Application Information

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IPC IPC(8): H04L1/00H04B1/707H04L25/03
Inventor 吴晓富宋越赵春明
Owner PLA UNIV OF SCI & TECH
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