Decoding method for CMMB receiver
A receiver and decoding technology, which is used in error correction/detection using block codes, error detection coding using multi-bit parity bits, digital transmission systems, etc. Playing quality and other issues, to achieve the effect of normal display playback, improved reception performance, and improved reception performance
Active Publication Date: 2012-11-14
HANGZHOU NATCHIP SCI & TECH
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Problems solved by technology
[0006] For the errors that cannot be eliminated after RS decoding, the existing technology does not do any processing, and they are regarded as uncorrectable errors and sent directly to the subsequent link. When the error is serious, it will cause mosaic phenomenon on the display of the CMMB receiver, affecting the quality of audio and video playback.
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[0027] The technical scheme of the present invention is described below in conjunction with accompanying drawing
[0028] Such as figure 1 Shown, a kind of CMMB receiver decoding method, concrete steps are:
[0029] Step (1) all the reliability flags are cleared to 0;
[0030] Step (2) Send the codeword before LDPC decoding to the LDPC decoding module for decoding, and then send the codeword through LDPC decoding to the byte block deinterleaving module; at the same time, the codeword corresponding to the LDPC decoding of the codeword contains errors The instruction is sent to the deinterleaving module;
[0031] The feature of the LDPC decoded code word containing an error indication is: if the currently output LDPC decoded code word contains an error, the indication is 1; if the currently output LDPC decoded code word does not contain an error, the indicates 0;
[0032] Step (3) The byte block deinterleaving module fills the codewords decoded by LDPC into the deinterleavin...
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The invention relates to a decoding method for a CMMB receiver. At present, the prior art does not process the error which still cannot be eliminated after RS decoding, the error is taken as in-correctable error and directly sent to a subsequent link, and when the error is serious, the display of the CMMB receiver produces mosaic phenomenon to influence the audio / video play quality. The method determines the position of error information based on cascade of internal codes and external codes, decodes the external code output by repeatedly using the cascade of the internal codes and the external codes, corrects the error by using an information constraint relationship defined by the internal codes and the external codes on different dimensions, fully plays the advantage of error correction and decoding of the internal codes and the external codes, corrects the error at a channel decoding stage as much as possible, and improves the receiving performance of the CMMB receiver. Compared with the traditional method, the method of the invention can further improve the receiving performance nearby a receiving threshold so as to correct the error at the channel decoding stage as much as possible and realize normal display and play of the CMMB receiver.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a decoding method for a CMMB receiver. Background technique [0002] The China Mobile Multimedia Broadcasting (CMMB) transmission system adopts the technical system of cascading inner code and outer code. The inner code adopts low-density redundancy check code (LDPC code), and the outer code adopts Reed-Solomon code (RS code). . Byte block deinterleaving is used between the inner code and the outer code to break up channel errors and enhance the error correction capability of the receiver. After LDPC decoding of the inner code, the errors falling within the range of the LDPC error correction capability will be corrected, and the errors beyond the error correction capability range will be sent to the subsequent outer code to be corrected by the outer code. The information constraint relationship of the codeword encoded by LDPC is based on the vertical dimension in t...
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IPC IPC(8): H04L1/00H03M13/11
Inventor 邢新景张迎杨晖
Owner HANGZHOU NATCHIP SCI & TECH