标题：Fairness-based pilot allocation in multi-cell massive MIMO systems
作者：Han, Xiting ;Zhang, Haixia ;Wu, Dalei ;Yuan, Dongfeng
作者机构：[Han, Xiting ;Zhang, Haixia ;Yuan, Dongfeng ] Shandong Provincial Key Lab of Wireless Communication Technologies, Shandong University, China;[Wu, Dale 更多
会议名称：International Conference on Wireless Communications and Signal Processing, WCSP 2015
会议日期：15 October 2015 through 17 October 2015
来源：2015 International Conference on Wireless Communications and Signal Processing, WCSP 2015
摘要：This paper addresses the fairness-based pilot allocation (PA) problem in multi-cell time-division duplex (TDD) massive MIMO systems. In such systems, the pilot contamination constitutes a major bottleneck, making the signal-to-interference ratio (SIR) saturated. In this work, we first derive the relation between asymptotic uplink SIR and PA. Based on the derived SIR, a fairness-based PA problem is formulated as a 0-1 integer programming problem to guarantee the fairness among users. Since the formulated problem is NP-hard, a centralized PA solution is proposed through reformulating the fairness-based PA problem as a mixed integer linear programming problem (MILP). In addition, to further decrease the computational complexity, a greedy PA solution is proposed based on the criterion that the user suffering the severest interference has the highest priority in PA. Simulation results show that the proposed two PA schemes are approximately optimal with much lower computational complexity than existing PA schemes. © 2015 IEEE.