分布式天线无线通信系统性能分析

Performance analysis of distributed antenna wireless communication systems

提出一种针对于CDMA系统设计的分布式天线无线通信系统.系统中的分布式天线把接收到的无线信号通过光纤传送到中央处理单元,在中央处理单元进行RAKE接收,同时可以得到宏分集效果。由于分布式天线相隔足够远,阴影衰落效果也必然统计独立,包络服从Rice Lognormal分布。给出了Rice Lognormal复合信道情况下RAKE接收机中断概率和平均误码率的表达式,同时通过仿真给出了不同衰落信道情况下的性能曲线。仿真结果表明,采用CDMA分布式天线无线系统,可以提高中断概率和降低误码率,是为未来移动通信系统设计的一种有效方案。

Distributed antenna wireless communication system is proposed for a code-division multiple access (CDMA) system. The proposed system separated each component of independent signals passing through the multipath in radio and optical links, which are gathered at the central control unit, by using RAKE reception. The macrodiversity effect was obtained. Distributed antennas were located far enough, so independent shadowing effort was obtained. The envelope of the received signal was subjected to Rice-Lognormal distribution. The expression of outage and average bit error ratio (BER) of RAKE receiver was given under the Rice-Lognormal composite fading channel. Simulations show the performance under different fading channels. Simulation results show that a distributed antenna wireless communication system can improve outage probability and BER performance, and it is a promising technology for future wireless communication systems.