Opportunistic Spatial Multiuser Diversity When Transmitter has More Antennas in Downlink
MIMO can enhance the performance of wireless system greatly. However, the limited battery life and terminal size of the UE in a cellular system put a constraint on the performance enhancment from MIMO. Especially when the tranmitter has more antenna than the receiver in downlink, the conventional MIMO schemes can only exploit partial spatial multiplexing gain and diversity gain. For different users’ independent locations lead to independent spatial fading one another, adapative spatial and temporal scheduling can be developed to exploit the spatial multiuser diversity and achieve the tradeoff between multiplexing gain and spatial diversity gain available. In this paper, the enhanced MIMO schemes with greedy multiuser diversity are compared when Node B has more antenna than UE, e.g. Zero Forcing Beamforming (ZFB), Dual Space Time Block Coding (DSTBC), Singular Value Decomposition (SVD) and Vertical Bell labs Layered Spatial Time code plus Antenna Selection (VBLAST-AS). From the simulation results, the ZFB has achieved the best spectrum efficiency, and the gain exceeds VBLATS-AS and DSTBC more than 50％.
Guangyi LIU Jianhua ZHANG
Beijing University of Posts & Telecoms,100876
国际会议
武汉
英文
2006-09-01（万方平台首次上网日期，不代表论文的发表时间）