多天线系统中的多用户分集方案的性能分析及比较

在多天线多用户无线通信系统中，可以利用用户之间彼此独立的随机衰落信道的特点，结合随机波束成型技术，或者空间分集技术，或者天线选择技术，获得多用户分集增益。然而不同多用户分集方案的系统性能不尽相同。该文分析了在多输入单输出(MISO)信道中目前几种典型的多用户分集方案的性能，给出系统吞吐率的定量表达式，并综合比较了不同用户数和不同天线数对各种多用户分集方案性能的影响，为实际多天线多用户系统设计提供了有益的参考。

Performance Analysis and Comparison of Multiuser Diversity Schemes in Multiple Antenna System

In a multiuser wireless system with multiple antennas, the independence of different users' random fading characteristic can be exploited to obtain great gain of multiuser diversity by combining different techniques, such as random beamforming, spatial diversity, antenna selection. The performance of these different multiuser diversity schemes is not the same. This paper gives out the formula of the average throughput and analyzes the performance of some typical multiuser diversity schemes. This paper also compares the effect of number of users and antennas on throughput performance of different multiuser diversity schemes. It will present beneficial reference for the design of practical multiuser system with multiple antennas.