| 摘要: |
| 远距离短波通信过程复杂，接收信号相位、幅度都发生剧烈变化。为提高远距离短波
通信性能，采用本土多台站构成宏分集，结合最大比合并方法性能最优和解码后合并方法实
现简单的优点，对两种方法进行折衷，提出了一种基于信道信息修正的解码后合并方法，并
对其性能进行理论分析和仿真实现。仿真结果表明，在误码率为10－4时，修
正后的解码后合并法比传统择多判决的方法提高了2 dB，当接收台站数大于5时，该修
正算法性能优于等增益法接近最大比法。该方法易于实现，为实际通信中合并方法的选择提
供了有效参考。 |
| 关键词: 短波通信 宏分集 分布式接收 信道信息 解码后合并 |
| DOI： |
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| 基金项目: |
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| A modified combining-after-decoding algorithm based on channel state information |
| XIE Si-jun,XU Yi-tao,CHEN Hao-nan |
| () |
| Abstract: |
| The process of long-distance HF communication is complex,and the received signa
l′s amplitude and phase change dramatically.To improve the performance of lo
ng-distance HF communication, the local stations are used to form macro diversi
ty.The method of maximum ratio combining has optimal performance and the method
of combining after decoding is simple.Compromising the advantages between the t
wo methods,the modified combining-after-decoding scheme based on chann
el state information(CSI) is proposed. Performance analysis and simulation show
that,
the modified method increases 2 dB while the PER is 10－4,and whe
n the numbers of the received station are larger than 5,the performance of modif
i
ed method is better than that of equal-gain scheme,and close to that of the maxi
mal
ratio scheme.This modified method is easy to implement and provides an effective
reference for choosing combining scheme in the actual communication. |
| Key words: HF communications macro diversity distributed receiving channel state informa
tion combining-after-decoding |
《电讯技术》编辑部 