摘要
将散射信道建模为低莱斯因子衰落信道,并基于高斯近似和快速傅里叶变换推导了LDPC码在该信道中的误码率。针对差分进化中码字度分布值可能无效的问题,对算法进行修改并得到了优化的LDPC码。仿真结果表明推导的理论误码率与实际码字性能非常接近,且优化后的不规则码相对规则码有0.5~0.7 d B的性能增益。
The channel of scatter communications is modelled as a Rician channel with low K-factors,over which the bit-error-rate（ BER） of LDPC code is derived based on Gaussian approximation and fast Fourier transform.The differential evolution algorithm is modified to avoid the value ineffectivity of degree distribution,and then the LDPC code is optimized.The simulation shows that the BER is in good agreement with the performance of practical code,and the designed irregular code has an improvement of 0.5-0.7 d B relative to regular code.
作者
戴精科
林开亮
DAI Jingke;LIN Kailiang(Rocket Force University of Engineering,Xi＇an 710025,China;Northwest A＆F University,Xi＇an 712100,China)
出处
《无线电通信技术》
2018年第5期440-443,共4页
Radio Communications Technology
基金
国家自然科学基金项目(61501469)
中国博士后科学基金资助项目(2015M572782)
关键词
散射通信
LDPC码
误码率
度优化
scatter communications
LDPC code
bit-error-rate
optimization of degree
