摘要
介绍了一种不用改变编译码器的基本结构就能实现较宽范围内码率变化的码———收缩码;Ka波段移动卫星通信系统雨衰信道的统计特性为莱斯分布,可以表示成一个3状态的马尔可夫链模型;在此模型的3个状态中分别采用了不同码率的收缩码进行纠错编码,克服Ka波段移动卫星通信信道的雨衰,以满足信道模型中传输误码率的要求。通过对DWMT与DMT进行性能上的比较,说明DWMT性能优于DMT,有望用于宽带接入网技术。
: This paper presents the punctured convolutional code that is a kind of codes varying in wide range of the code rates without changing the primary structures of encoders and decoders. The rain fading channel statistical characteristics of ka-band satellite mobile communication system is of Rician distribution which can be described by 3-state Markov chain model; and three kinds of punctured convolutional codes with various code rates are adopted respectively in the model states for the purpose of overcoming the rain attenuations, and achieving the required BER of transmission in the channel model.
出处
《空军工程大学学报（自然科学版）》
CSCD
2003年第1期34-37,共4页
Journal of Air Force Engineering University(Natural Science Edition)
关键词
移动卫星通信系统
抗雨衰对策
自适应纠错编码
收缩码
雨衰信道
维特比译码
rain attenuation
rain fade countermeasures
adaptive error correction coding
quasistationary-channel
punctured convolutional code
Viterbi decoding
