Shengtian Yang

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The average weight distribution of a regular low-density parity-check (LDPC) code ensemble over a finite field is thoroughly analyzed. In particular, a precise asymptotic approximation of the average weight distribution is derived for the small-weight case, and a series of fundamental qualitative properties of the asymptotic growth rate of the average(More)
We derive an upper bound on the average MAP decoding error probability of random linear SW codes for arbitrary correlated stationary memoryless sources defined on Galois fields. By using this tool, we analyze the performance of SW codes based on LDPC codes and random permutations, and show that under some conditions, all but a diminishingly small proportion(More)
In the authors' former work, it was proved by the code-spectrum approach that linear codes with good joint spectra serve as good candidates for lossless joint source channel coding (JSCC). However, it is still unknown how to construct such codes in practice. This paper aims to present some methods for constructing linear codes with good joint spectra, and(More)
A general lossless joint source-channel coding scheme based on linear codes is proposed and then analyzed in this paper. It is shown that a linear code with good joint spectrum can be used to establish limit-approaching joint source-channel coding schemes for arbitrary sources and channels, where the joint spectrum of the code is a generalization of the(More)
Linear codes with good joint spectra are good candidates for lossless joint source-channel coding (JSCC). However, in spite of their existence, it is still unknown how to construct them in practice. This paper is devoted to the construction of such codes. In particular, two families of linear codes are presented and proved to have good joint spectra. The(More)
The problem of finding good linear codes for joint source-channel coding (JSCC) is investigated in this paper. By the code-spectrum approach, it has been proved in the authors' previous paper that a good linear code for the authors' JSCC scheme is a code with a good joint spectrum, so the main task in this paper is to construct linear codes with good joint(More)
A general lossless joint source-channel coding scheme based on linear codes and random interleavers for multiple-access channels is presented and then analyzed in this paper. By the information-spectrum approach and the code-spectrum approach, it is shown that a linear code with good joint spectrum can be used to establish limit-approaching joint(More)
An information-spectrum approach is applied to solve the multiterminal source coding problem for correlated general sources, where sources may be nonstationary and/or nonergodic, and the distortion measure is arbitrary and may be nonadditive. A general formula for the rate-distortion region of the multiterminal source coding problem with the maximum(More)