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Accumulated low density parity check (LDPCA) codec is proposed for DISCOVER project in distributed video coding (DVC), which offers flexible coding rate. Although it can use feedback channel to adapt the rate to the correlation of the video, but in real applications, using feedback channel can not always be possible. To solve this problem, some researchers proposed estimating the code rate at the...
A parity check matrix construction method for constructing a low-density parity-check (LDPC) codes over GF(q) (q>2) based on the modified progressive edge growth (PEG) algorithm is introduced. First, the nonzero locations of the parity check matrix are selected using the PEG algorithm. Then the nonzero elements are defined by avoiding the definition of subcode. A proof is given to show the good...
In this paper, a joint source-channel coding (JSCC) scheme for unequal error protection (UEP) based SPIHT-coded image transmission over wireless channels is proposed. SPIHT-coded image information is divided into different substreams according to their different importance. Each substream is transmitted differentially over MIMO system based on MIMO adaptive channel assignment policy (ACAP) to achieve...
In this paper, a joint source-channel coding (JSCC) scheme for unequal error protection (UEP) based H.264 over wireless channels is proposed. H.264 coded information is divided into different parts according to their different importance, each part is transmitted differentially based on MIMO-OFDM system by applying unequal number of information bits in channel error- correction code to achieve unequal...
Q-ary low-density parity-check (Q-LDPC) codes have a better performance than those of the binary low-density parity-check (B-LDPC) codes, at short and medium block lengths, but the decoder of Q-LDPC has more complexity. In this article, a new stop criterion is proposed. By analyzing the changes of the maximum posteriori probability of the variable node, the criterion decides whether the iteration...
Based on decoding performance, complexity and latency of finite-geometry low-density parity-check (LDPC) codes, an efficient decoding algorithm is proposed. The algorithm is a hybrid bit-flipping (BF)/majority-logic (MLG) algorithm. In the algorithm, there are two stages. At the first stage, a code is decoded with bit-flipping (BF) with a small fixed number of iterations. Then the output from bit-flipping...
In this article, a spatio-temporal post-processing error concealment algorithm designed initially for a H.264 video-streaming scheme over packet-lossy networks has been presented. It aims at optimizing subjective quality of restored video and the conventional objective metric, peak signal-to-noise ratio (PSNR), as well, under the constraints of low delay and computational complexity, which are critical...
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