Xiuni Wang

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This paper is concerned with constructions of nonbinary low-density parity-check (LDPC) codes for adaptive coded modulations (ACM). A new class of efficiently encodable structured nonbinary LDPC codes are proposed. The defining parity-check matrices are composed of scalar circulant sub-matrices which greatly reduce the storage requirement when compared with(More)
In this paper, we propose a systematic form about a class of regular structured LDPC codes. This class of LDPC codes is quasi-cyclic code with variable node degree d<sub>v</sub> = 2 on the Tanner graph. The defining parity-check matrices are composed of circulant permutation matrices. By columns permutation, we can locate the information bits and parity(More)
  • Xiuni Wang
  • 9th International Conference on Communications…
  • 2014
A low-density parity-check (LDPC) code of column weight of 2 is known as an LDPC cycle code. In this paper, we study the encoding algorithm about a type of non-binary quasi-cyclic LDPC cycle codes. The position of parity check symbols is located firstly through parity check equations. Then, we show that these parity check symbols can be calculated linearly(More)
Multilevel coding with sigma-mapping is one simple way to obtain coding gain as well as shaping gain, while power-allocation, by allocating proper powers to different levels, can facilitate the iterative decoding/detection algorithms. In this paper, we utilize the EXIT chart to calculate the convergence threshold for each level by treating the signals from(More)
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