无线通信系统中的下行多用户MIMO传输策略比较

A Comparison of the Downlink Multi-user Multiple Input Multiple Output Schemes in Wireless Systems

多天线处理技术是下一代无线通信系统中的一种重要技术,通过在发送端和接收端配置多根天线可以有效的改善系统容量.目前存在多种下行多用户多天线传输方案,如ZF-DPC,BD和ZFBF.从复杂度和系统性能角度考虑,对多用户MIMO传输方案进行了分析和比较.分析了不同发射方案的和速率和功率分配.通过仿真,验证和比较了不同方案的和速率性能、多用户分集特性及可支持的最优用户数特性.

Multiple input multiple output （MIMO） processing techniques are important for the next generation wireless communication systems due to their potential ability to improve dramatically the system capacity. There have been existed several multi-user MIMO （MU-MIMO） transmit schemes such as zero-forcing dirty paper coding （ZF-DPC）, block diagonalization （BD）, and zero-forcing beam-forming （ZFBF）. These schemes are analyzed and compared by taking into account the system performance and complexity. The power allocation and sum data rate are investigated. The sum data rate, multi-user diversity, and the optimal user number that can be supported are evaluated by computer simulations.