摘要
建立了一个实际的非对称双向多中继系统模型,并采用机会中继策略,推导出了该模型在译码转发方式下采用网络编码时的中断概率表达式,Monte Carlo仿真和理论值吻合,充分验证了该表达式的正确性。分析了不同中继节点位置、不同中继节点个数和不同功率分配因子等情况下的系统中断性能,揭示了最优功率分配因子与中继节点个数和位置以及系统总功率的内在关系。仿真结果表明,在非对称双向多中继系统中同时采用网络编码和机会中继策略时,功率分配因子取值为0.6时可获得最佳的系统中断性能,并指出在研究系统中断概率问题时,中继节点位置是一个不可忽略的因素。
A practical asymmetrical bi-directional multi-relay system model is firstly constructed, and then an outage probability expression of the model is given based on opportunistic relay scheme and network coding, which is proved accurate by Monte Carlo simulations. Secondly, it analyzes the system average outage probability with different situations of power allocation coefficient, locations of the relay nodes and the number of relay nodes, indicating the inherent relationship between power allocation coefficient and total system power, as well as the number of relay nodes. Simulation results show that the optimal system outage performance of asymmetrical bi-directional multi-relay system based on opportunistic relay scheme and net- work coding is attained when power allocation coefficient is chosen at 0. 6 or about 0. 6. It can be known that the location of relay nodes is an important factor for the problem of system outage probability.
出处
《数据采集与处理》
CSCD
北大核心
2013年第1期28-33,共6页
Journal of Data Acquisition and Processing
基金
国家重大科技专项(2010ZX03003-003-01)资助项目
国家高技术研究发展计划("八六三"计划)(2009AA01Z249)资助项目
国家自然科学基金(60972050)资助项目
江苏省自然科学基金(BK2011002)资助项目
关键词
网络编码
机会中继
中断概率
功率分配因子
network coding
opportunistic relay
outage probability
power allocation coefficient
