摘要
针对瑞利衰落信道下双向多中继协作通信系统,为了降低中断概率,提出了一种基于最小化中断概率的中继选择策略和功率分配方案。首先联合考虑两条链路的中继节点处信噪比和信道增益实现双链路中继选择,然后推导出一种新的最优中继下双向放大转发协作中断概率的近似表达式上界,并利用凸优化求解得到使中断概率最小的最优功率分配解。仿真结果表明,与现有策略相比,提出的策略能够明显降低系统中断概率和误码率,显著提高系统性能。
A strategy of joint relay selection and power allocation for two-way relay networks over Rayleigh fading channels to minimizing the outage probability is investigated. Firstly, double link relay selection with the joint of the SNR and the channel gain are achieved. Then a new tight upper bound of two-way amplify-and-forward outage probability with best relay is derived, Furthermore, the convex optimization problem with Lagrange multipliers to get the optimum power allocation is solved. Then SNR and channel gain are jointed to achieve optimal relay option. Simulation results show that, com- pared with the strategies exist, the proposed power allocation and relay selection strategy can significantly reduce the system outage probability and bit er- ror rate, and improve the system performance significantly.
出处
《电视技术》
北大核心
2014年第9期160-164,共5页
Video Engineering
基金
江苏省普通高校研究生科研创新计划项目(CXZZ11_0398)
关键词
双向中继协作
中断概率上界
优化功率分配
双链路中继选择
two-way relay cooperative
upper bound of outage probability
optimal power allocation
double link relay selection
