Multiple Access of MIMO OFDMA: TDMA, FDMA/TDMA, or SDMA/FDMA/TDMA
Multiple Input and Multiple Output (MIMO) can greatly enhance the performance of wireless system. However, the limited battery life and terminal size of the User Equipment (UE) in a cellular system put a constraint on the performance enhancment by MIMO. Especially when the tranmitter has more antenna than the receiver in downlink, the conventional MIMO schemes can only exploit partial multiplexing gain and diversity gain. For a multiuser system, multiuser diversity gain can be achieved by exploiting the independent frequency and spatial selective fading one another.In this paper, different multiuser multiple access schemes wih greedy scheduling of MIMO OFDMA are invstigated, e.g. TDMA, FDMA/TDMA and SDMA/FDMA/TDMA. For full spatial-frequency multiuser diversity gain and spatial multiplexing gain can be achieved, SDMA/FDMA/TDMA obtains highest spectrum efficiency. Its gain exceeds that of TDMA and FDMA/TDMA at least 80% and 40% respectively. The more antennas configured, the more gain can be observed from SDMA/FDMA/TDMA.
Guangyi LIU Feng JIANG Bei ZHOU Ying Wang Ping ZHANG Hongyan CUI
WTI Institute, Beijing University of Posts & Telecoms, 100876
国际会议
2006 International Conference on Communications,Circuits and Systems(第四届国际通信、电路与系统学术会议)
广西桂林
英文
1367-1371
2006-06-25(万方平台首次上网日期,不代表论文的发表时间)