移动WiMAX网络频谱效率和能量效率研究

摘要

基于IEEE802.16e协议,给出了全球微波互联接入(WiMAX)多小区/多用户情况下信干噪比(SINR)的近似计算方法,据此计算出了WiMAX的7小区模型的频谱效率和能量效率,分析了频谱效率和能量效率同小区半径、发射功率等网络参数的关系.仿真结果显示:链路的频谱效率受用户和基站之间距离的影响较大,受发射功率影响几乎可以忽略；整个小区的频谱效率在小区半径较大时,主要受噪声影响,半径较小时,主要受干扰影响；小区的能量效率随着发射功率的增大会出现一个最大值；小区能量效率随带宽的增大而增大.这些都为移动WiMAX网络的能量优化提供了依据.%Based on the IEEE802.16e protocol,the method for approximate calculation of the signal to interference plus noise ratio (SINR) of a world wide interoperability for microwave access (WiMAX) cell in the case of multi-cell/ multi-user was deduced.By using the SINR,the spectrum efficiency and the energy efficiency of a central cell were calculated for a WiMAX 7-cell model.The relationships between the spectrum efficiency,the energy efficiency and the network parameters such as cell radius and transmitted power were analyzed to provide the theory basis for network energy consumption optimization.The simulation results show that the spectrum efficiency of the link is mainly affected by the distance between a user' s location and the base station (BS),and the transmitted power has little effect on it ; the spectrum efficiency of a cell is mainly affected by interference when its radius is small and by noise when the radius is large; the energy efficiency reaches a maximum value for a specific transmitted power; the energy efficiency grows with the transmission bandwidth increasing.The results can help to make decisions about cell radius or transmitted power so as to reduce the energy consumption of networks.