摘要
LDPC码作为纠错能力最强的信道编码,在深空通信中具有广泛的应用前景。研究了LDPC码的BP译码算法,并对该算法进行了仿真,分析了LDPC码的误码率随BP译码迭代次数的演化情况,提出了一种改进的BP译码算法。经过仿真验证,改进的BP译码算法,在信噪比低于译码阈值时能够大幅地减少译码迭代次数,降低运算复杂度,而性能却几乎没有降低。这种改进的BP译码算法对LDPC码在深空通信中的应用具有重要的意义。
With the best error-correcting performance, LDPC codes can be widely used in deep space communication. Based on the study of BP decoding algorithm, LDPC codes were stimulated and the BER performance transforming with the decoding iteration number was analyzed. Then an improved BP decoding algorithm, which significantly reduced the iteration number when SNR was lower than the decoding threshold, but, hardly degraded the decoding performance, was proposed. The performance of the improved BP decoding algorithm was validated by stimulation. This improved BP decoding algorithm is valuable to deep space com- munication where small-scale equipment is required.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2009年第1期240-243,共4页
Journal of Astronautics
