Relay selection region and system performance analysis for interfered cooperative ad-hoc networks

有扰环境协作自组织网络的中继区域选择及系统性能分析(英文)

The performance of interfered cooperative ad-hoc networks is analyzed by stochastic geometry analysis and a selection region of relay is presented. First, assuming that the distribution of nodes in the random network follows the Poisson point process （PPP）, a closed-form expression of the outage probability is derived for the best relay selection （BRS） scheme. Secondly, the capacity of the network is presented for this scheme. Finally, a performance factor is defined to evaluate the performance gain obtained from the BRS. By using this factor, a relay selection region is found to guarantee the performance gain from the BRS. The analysis and simulation results show that the performance of the BRS not only depends on the densities of source nodes and relay nodes but also on the factors of networks such as the path loss factor and the decoding threshold. And the BRS has a greater advantage than direct transmission （DT） in hush environments such as the long transmission distances, much interference and the high decoding thresholds.

采用随机几何方法,分析了有扰的协作自组织网络的性能并给出中继的选择区域. 首先,假设随机网络中的节点服从泊松分布,得到最佳中继选择算法中断概率的闭式解; 其次,给出了此算法的网络容量; 最后,定义性能参数来衡量采用最佳中继选择算法带来的性能增益,并根据此参数得到中继选择区域以保证采用最佳中继选择算法时可以得到的性能增益. 分析和仿真结果表明: 最佳中继选择算法的性能不仅取决于源节点和中继节点的密度,还与路径损耗参数和解码门限等网络参数有关,在传输距离较远、干扰较多、解码门限较高等情况下比直接传输具有更大的优势.