分布式天线小区协作通信系统下行链路频谱效率的研究

Spectrum efficiency of coordinating distributed antenna cellular systems

针对多小区分布式天线系统中下行链路的干扰问题,提出将基站协作通信和分布式天线技术相结合,通过最大化最小的用户频谱效率,保证用户频谱效率的公平性.同时提出一种用户天线选择关闭算法,改进了传统的基站协作迫零波束成形技术在用户数接近最大值时频谱效率急剧下降的缺陷.仿真结果表明,采用分布式基站天线和用户天线选择技术的小区协作通信,可以获得更高的用户频谱效率.

To mitigate the interference in distributed antenna cellular downlink systems, the base station coordination is combined with distributed antenna technology. The minimum spectrum efficiency among users is maximized to keep the fairness. In order to combat the deficiency in traditional base station coordination systems adopting zero-forcing beamforming, in which the user＇s spectrum efficiency drops rapidly when the user number reaches the maximum, a user antenna off-selection method is further proposed. It is shown in the simulation that the user antenna selection cellular coordinating system equipped with distributed antennas can achieve higher equal spectrum efficiency.