摘要
分析了宽带 DS/ CDMA系统在多径瑞利信道中的性能 ,针对多径频率选择性信道对 Turbo码译码提出了修正算法——由 Rake接收输出经最大比例合并等处理后的信号 ,除以信道幅度参数αmi 的平方之和 ,以高斯分布计算 Turbo码译码的 γ函数 ,并进行 Turbo码译码 .系统仿真显示 ,该修正算法极大地提高了系统的误码性能 .
The performance of DS/CDMA systems on multipath fading Rayleigh channels is analyzed. And proposes a modified decoding algorithm of Turbo code on multipath frequency-selective fading channels,i.e. the signal with maximum ratio combiner divides by the all square of amplitudes of the channel, calculate the probability function γ for Turbo code, and then decode the signal as Turbo decoding. Computer simulations indicate that the modified algorithm improves greatly the performance of DS/CDMA systems on multipath frequency-selective fading channels and is a promising algorithm.
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
2001年第1期6-11,共6页
Journal of Beijing University of Posts and Telecommunications
基金
国家自然科学基金!资助项目 ( 698962 4 3 )
关键词
多径衰落
瑞利衰落
TURBO码
DS/CDMA
频率选择性信道
译码算法
Algorithms
Channel capacity
Code division multiple access
Computer simulation
Decoding
Mathematical models
Probability density function
Rayleigh fading
