双向中继系统的中断概率及功率分配策略

研究了Nakagami-m衰落信道下双向中继系统的中断性能,首先推导了中断概率的下界,并将通过Monte Carlo仿真得到的中断概率与此理论中断概率的下界进行了对比,结果表明仿真值非常接近于理论值;其次,考虑在系统总功率受限的情况下,以最小化系统的中断概率为优化准则,提出一种基于信噪比平衡的功率分配方法,此方法使得2目的节点能根据已知瞬时信道状态的变化自适应地调整发射功率,仿真结果表明基于该方案的中断性能明显优于基于等功率分配方案的中断性能.

Outage probability and power allocation strategy in a two-way relay system

The performance of outage in a two-way relay system in Nakagami-m fading channels was studyed. First, a lower bound of outage probability was derived by Monte Carlo simulation and then the simulation result was compared with the lower bound in theory. Simulation results show that the simulated outage probability is very close to the value in theory. Furthermore, in considering a total power constraint, and according to the optimization criterion of minimizing the outage probability, an optimum power allocation method based on SNR balancing was proposed. This method makes it possible for two destination nodes to adaptively adjust the sending power based on the change of instantaneous channel conditions. Simulation results show that the proposed method notably improved the system outage performance, compared to the equal power allocation method.