传统半双工与纯全双工无线通信系统容量分析及比较

Capacity Analyses and Comparisons of Pure-Full-Duplex and Half-Duplex Wireless Communication Systems

通将全双工技术应用到无线通信中,理论上能够比现有半双工技术提升一倍系统容量。首次给出一种纯全双工无线节点场景,并依据香农公式以各节点发射功率和带宽为自变量构造出系统容量闭合表达式。借助MATLAB工具利用最大化加权和速率算法仿真自干扰抵消水平及矢量幅度误差对系统性能的影响,同时给出相同条件下半双工系统的性能仿真作为比较。系统地分析全双工技术应用到无线通信中存在的优势,结果表明全双工无线系统只在一定条件下具有优于半双工系统的性能。

The application of full-duplex （FD） technology in wireless communications would theoretically double the system capacity in comparison with current half-duplex （HD） technology. In this paper, a pure-FD wireless scenario is presented and the close-form expression of system capacity with the independent variables of node transmission power and bandwidth according to Shannon formula is derived. By means of maximizing weighted sum rate algorithm on MATLAB software, the impact of self-inference cancelling and error vector magnitude （EVM） on system performance is simulated in comparison with the results of HD system in the same conditions. This paper in-depth analyzes the advantages of FD technology in wireless communications with the simulation results showing that FD wireless system outperforms HD system only in certain conditions.