摘要
本文将交织、信道输出软信息、信道特征软信息相结合 ,研究Rayleigh衰落信道下卷积码的Viterbi软判决译码 ,在利用和不利用信道状态信息 (CSI)两种情况下给出软判决的支路度量计算公式和性能仿真结果 ,计算了卷积码的性能上界 ;研究了解调器输出量化门限 (量化级数目、量化间距 )对译码性能的影响 .
The paper investigates the performance of soft decision Viterbi decoding for convolutional codes in Rayleigh fading channels by using a new scheme that combines interleaving technique, soft output of the channel and the information about the channel. The formulations for computing the soft decision metrics with or without Channel State Information (CSI) are presented and the performance gains are demonstrated. In addition, we discuss the influences of quantizer thresholds on the decoding performance. The results are compared with the corresponding conclusions in AWGN channels.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2001年第6期849-852,共4页
Acta Electronica Sinica
基金
国家自然科学基金!(No.6 9872 0 2 0
No .6 9882 0 0 2
No .6 0 0 730 49)
东南大学移动通信国家重点实验室开放基金!(No .W990 0 1)
关键词
软判决译码
卷积码
信息状态信息
衰落信道
Calculations
Communication channels (information theory)
Computer simulation
Convolutional codes
Decision theory
Decoding
Demodulators
Mathematical models
Rayleigh fading
