Efficient User Identification and Semi-Blind Channel Estimation for MU-MIMO Systems

被引：9
|
作者：
Missaoui, Nejah [1 ]
Kammoun, Ines [1 ]
Siala, Mohamed [2 ]
机构：
[1] Univ Sfax, LETI, ENIS, BPW 3038, Sfax, Tunisia
[2] Univ Carthage, MEDIATRON, SupCom, Tunis 2083, Tunisia
来源：
IEEE WIRELESS COMMUNICATIONS LETTERS | 2017年 / 6卷 / 02期
关键词：
Blind user identification; multi-user MIMO systems; pilot contamination; slotted ALOHA; semi-blind channel estimation;
D O I：
10.1109/LWC.2016.2643666
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
In this letter, we consider an uncoordinated access to the uplink of MU-MIMO cellular networks. Based on randomly rotated modulation constellations, we propose an efficient approach to blind identification of active users and estimation of all involved channels, up to a discrete phase ambiguity. To eliminate this ambiguity, we use short orthogonal pilot sequences. To improve the obtained channel estimates, we also rely on a combination of pilot-based and blind channel estimates. Moreover, since no coordination is assumed with the base station the problem of pilot contamination can occur when some active users use the same pilot sequence. As a solution for this problem, we propose an efficient semi-blind recovery of all contaminated channel estimates.
引用
收藏
页码：150 / 153
页数：4
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