摘要
将高斯估计方法运用到IRA码在具有加性白色高斯噪声和删除干扰的混合信道上的性能分析中,导出了IRA码在该信道上概率密度进化的递归等式和误码率的解析表达式.根据所得的解析结果,对IRA码在混合信道上的渐进性能进行了预测并提出了IRA码的优化设计方法.
Gaussian approximation models the message density in message passing decoders as Gaussian distribution. In this paper, irregular repeat accumulate （IRA） codes over the mixed white Gaussian noise/erasure channels are designed using Gaussian approximation. Recursive equations of density evolution and analytic expressions of bit error rate are derived. The analytic results not only provide a way to predict asymptotic performance of IRA codes but also help us design good IRA codes over the mixed channel. Comparison between simulation results and thresholds computed from analytic results shows that predication from the theoretical results is accurate enough. The optimized IRA codes designed for the mixed channels have better performance than that of IRA codes designed for AWGN channels when the designed erasure probability is close to the actual probability.
出处
《应用科学学报》
CAS
CSCD
北大核心
2006年第2期176-180,共5页
Journal of Applied Sciences
关键词
不规则重复累积码
高斯估计
高斯噪声
随机删除
irregular repeat-accumulate codes
Gaussian approximation
Gaussian noise
random erasure
