Wireless Data Transmission Reliability Improvement for LDPC-based Train-Ground Fault Supervisory Systems
Lan Chen, Jian Chen, Guochun Wan · International Conference on Electronics, Communications and Control · 2012
Along with the developments of high-speed railway, higher and higher technical requirements for the high-speed railway mobile communication system are raised. In order to solve wireless data transmission reliability problem at train-ground (TG) communication system, a kind of LDPC-based fault supervisory and control model is proposed in this paper. By introducing LLR-BP (log likelihood ratio - Belief Propagation) and their derivative reduced complexity 4-min decoding algorithms of low-density parity-check codes, Numerically accurate representations of check-node update computation used in LLR-BP decoding are described. Approximate representations of the decoding computations are shown to achieve a reduction in complexity by simplifying the check-node update, or symbol-node update, or both. Simulation results showed the significant effectiveness of the proposed technique in improving error correction performance and the throughput of the train-ground channel decoder. LDPC-based fault supervisory and control design platform has been developed to aid in vehicle fault analysis and performance evaluation.