空时编码OFDM/SDMA系统的性能分析

Performance Analysis of Space-Time Coded OFDM/SDMA Systems

分析了每用户双发送天线的空时编码OFDM/SDMA系统上行链路的性能.对采用空时分组码和空时格码的OFDM/SDMA系统分别给出了不同的多用户检测算法.仿真结果表明,采用相同数目的接收天线时,空时分组编码的系统性能优于无编码的系统;而空时格码编码的系统性能在采用双倍接收天线时才优于无编码的系统.在抑制多用户干扰方面,空时分组码优于空时格码.

This paper analyzed the performance of the uplink of space-time coded orthogonal frequency division multiplexing/space division multiple access OFDM/SDMA systems which they assume each user is equipped with two transmit antennas. Different multiuser detection algorithms for space-time block coded (STBC) system and space-time trellis coded (STTC) system were proposed. The simulation results show that the performance of STBC system is better than that of the system without transmit diversity when using the same number of receive antennas, whereas those performance can be obtained by using double transmit antennas for STTC system. So STBC system outperforms the STTC system as viewed from the ability of restraining the interference between users.