多天线的发送分集系统中多用户分集的研究

研究了如何通过选择发送天线和天线组合来提高整个多用户多天线系统的性能。本文分别讨论了STOBC、选择式发送分集、相位加权等各种发送信号结构下系统的调度性能。和其它发送信号结构相比,STOBC对于调度性能有着很大危害。信道反馈信息越多,调度性能就越好。不同的发送天线选择和组合策略得到不同的性能。本文讨论了三种选择策略:max-max, max-sum和max-min。max-max的调度性能优于其它两种策略。因此,发送信号的结构和选择策略都严重影响着多用户分集。

Multiuser diversity in the multiple-antenna data networks over the fading channels

We address the problem of multiuser diversity in the multiple-antennna wireless systems. Several schemes such as space-time orthogonal block code(STOBC), antenna selection and phase weighting are investigated and it is shown the throughput of STOBC is lower than that of the single transmit antenna. When there are two receive antennas, antenna selection and combination is used to utilize the scheduling gain. We propose three strategies called max-max, max-sum and max-min to select the best combination. It is shown that the max-max strategy has the maximal throughput. In a word, transmit signal structures, receiver structures and selection strategies have great influences on the multiuser diversity.