摘要
为了降低协作通信系统中的通信中断概率,研究了放大转发-分布式空时编码(AF-DSTC)协作通信协议,分析了各协作节点间的功率分配问题,并提出了一种在已知信道平均增益时,以降低系统中断概率为目标的功率分配方案.各协作节点根据其收到的源信号功率以及到目标节点的信道平均功率增益,计算其选取决定系数(SDP),其中SDP高于选取门限的协作节点将平均分配发射功率.研究结果表明,该方案计算复杂度低,仅需知道信道的平均增益,较大地降低了通信中断概率,在B3G/4G移动通信系统中具有一定的实用价值.
In order to reduce the outage probability in cooperative communication system, this paper studied the cooperative communication protocol based on amplify-and-forward distributed space-time code （AFDSTC）, analyzed the power allocation problem among the cooperation nodes, and proposed a power allocation scheme aiming to reduce the system＇s outage probability based on mean channel gain information. The cooperation nodes compute their selection decision parameter （SDP） by combining the information of their received source signal power and the mean channel gains to the destination node, and then the transmitting power will be equally allocated to the nodes whose SDP are larger than a certain threshold. The simulation results demonstrate that with a low computing complexity, this scheme only needs the mean channel gain information and greatly reduces the outage probability, which is very promising in the future B3G/4G mobile communication systems.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2009年第3期377-380,共4页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金资助项目(60572157)
关键词
分布式空时编码
功率分配
中断概率
选取决定系数
distributed space-time code （DSTC）
power allocate
outage probability
selection decision parameter
