采用最优放大因子的全双工中继选择方案

在多中继协作通信系统中，提出一种基于放大转发协议的全双工中继选择算法并进行了相应的理论分析。由于全双工中继中自干扰的存在，为保证通信的质量，首先利用传统的最大化边界信干噪比算法选择一个中继，然后利用中继的最优功率放大因子来减小自干扰对系统的不利影响。基于最优放大因子的全双工中继选择方案在系统中断概率、中继节点功率消耗、目的节点接收信干噪比方面都优于采用最大化边界信干噪比的系统。最后，我们利用蒙特卡洛仿真结果证明了该选择算法的优势。 

Full-Duplex Relay Selection Scheme Applying the Optimal Amplify Factor

We propose a full-duplex relay selection algorithm based on amplify-and-forward protocol and conduct the theoretical analysis in the cooperative communication system with multiple relays. Because of the existence of the loop interference in duplex relay, to guarantee the quality of communications, we select a relay based on maximizing the marginal signal to interference and noise ratio first, and then alleviate the impact of loop interference on the system by using the optimal amplify factor of relay. The relay selection algorithm based on the optimal amplify factor can provide a better performance than the traditional algorithm maximizing the marginal signal to interference and noise ratio in terms of outage probability, power consumption of relay, and received signal to interference and noise ratio at the destination. Finally，we demonstrate the advantages of the proposed algorithm with Monte Carlo simulations.