摘要
针对双向中继信道,文章研究采用放大转发协议的物理层网络编码的性能。在考虑直传链路下,给出了3时隙网络编码的可达速率。在高信噪比条件下,推导了3时隙物理层网络编码方案和2时隙物理层网络编码方案的中断概率近似表达式。通过仿真,验证了理论分析结果。同时,对3时隙物理层网络编码方案中继节点的功率分配因子进行了优化,在中继节点处于不同位置下分节点等功率和不同功率对不同方案进行了最大和速率的仿真,结果表明3时隙物理层网络编码可以利用网络的非对称性提高性能。
This paper investigates the performance of physical-layer network coding（PNC） using amplify and forward（AF） protocol for two-way relay channels.Taking direct link between two source nodes into account,achievable rate for three time slot PNC scheme is computed.We also derive high-SNR approximations of outage probabilities for two and three slot PNC schemes.Simulation results verify our theoretical asymptotic derivations.Moreover,power allocation factors of three time slot PNC is optimized.Numerical results show maximum sum-rate of different schemes for variable relay positions with equal and variable node powers.Simulation results demonstrate that three time slot PNC can exploit the asymmetries to improve performance.
出处
《信号处理》
CSCD
北大核心
2011年第3期334-339,共6页
Journal of Signal Processing
基金
国家自然科学基金资助项目(60972051
61001 107)
国家科技重大专项项目(2010ZX03006-002-04)
江苏省自然科学基金资助项目(BK2010101)
关键词
物理层网络编码
协同通信
中断概率
放大转发
physical-layer network coding
cooperative communication
outage probability
amplify and forward
