Abstract:

The parity matrix of low density parity check (LDPC) codes with short length has strong column dependence. As a result, it performs poorly in restraining bursterrors. In order to improve the capability of correcting bursterrors, we propose a method to construct irregular LDPC codes, and it can be achieved by randomly distributing edges of variable nodes in each layer. The feature of the construction reduces the column dependence of the parity check matrix. As a consequence, the proposed method performs well in restraining bursterrors. By calculating the minimum hamming distance and column dependence, the proposed method is proved effective. Simulation results demonstrate that the performance of the shortlength LDPC codes constructed by the proposed method is better than PEG, CCSDS standard and IEEE 802.16e LDPC codes in low signaltonoise ratio.

Key words: low density parity check (LDPC) codes;random distribution in each layer;column dependence;error floor;bursterrors