TITLE:
User Fairness Scheme with Proportional Fair Scheduling in Multi-user MIMO Limited Feedback System
AUTHORS:
Hongyu Wang, Weixiao Meng, Trungtan Nguyen
KEYWORDS:
User Fairness Scheme with Proportional Fair Scheduling in Multi-user MIMO Limited Feedback System
JOURNAL NAME:
Communications and Network,
Vol.5 No.3C,
November
7,
2013
ABSTRACT: In Multi-user MIMO (MU-MIMO) downlink system, suitable user selection schemes can improve spatial diversity gain. In most of previous studies, it is always assumed that the base station (BS) knows full channel state information (CSI) of each user, which does not consider the reality. However, there are only limited feedback bits in real system. Besides, user fairness is often ignored in most of current user selection schemes. To discuss the user fairness and limited feedback, in this paper, the user selection scheme with limited feedback bits is proposed. The BS utilizes codebook precoding transmitting strategy with LTE codebook. Furthermore, this paper analyzes the influence of the number of feedback bits and the number of users on user fairness and system sum capacity. Simulation results show that in order to achieve better user fairness, we can use fewer bits for feedback CSI when the number of user is small, and more feedback bits when the number of users is large.