NDLI: User Selection Method Adopting Cross-Entropy Method for a Downlink Multiuser MIMO System

Content Provider	Springer Nature Link
Author	Kim, Kyunghoon Yang, Hyunwook Choi, Seungwon
Copyright Year	2013
Abstract	This letter presents a novel method of user selection in a downlink multi-user multiple input multiple output (MU-MIMO) system employing the precoding procedures of zero forcing or block diagonalization (BD). The proposed technique utilizes the cross-entropy method (CEM) in order to maintain a performance level comparable to that of the full search (FS) method with reasonable complexity. With the CEM, the proposed system can select multiple users at once instead of selecting a single user at each step. From various computer simulations, it has been verified that the proposed method exhibits nearly 98 % of the sum-rate compared to the FS method, which implies that the proposed method far outperforms conventional methods such as semi-orthogonal user selection (SUS) or the capacity-based suboptimal user selection (CBSUS) algorithm. Compared to CBSUS, the proposed technique enhances the sum-rate by approximately 1.1 bps/Hz with about half the complexity when each user is equipped with two receiving antennas. In the case where each user is equipped with a single antenna, the proposed method outperforms the method of SUS by about 0.3 bps/Hz, at the expense of a complexity increase of $$O(2M)$$ times.
Starting Page	789
Ending Page	802
Page Count	14
File Format	PDF
ISSN	09296212
Journal	Wireless Personal Communications
Volume Number	74
Issue Number	2
e-ISSN	1572834X
Language	English
Publisher	Springer US
Publisher Date	2013-08-18
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	MU-MIMO User selection Cross entropy method Sum-rate Complexity Communications Engineering, Networks Signal, Image and Speech Processing Computer Communication Networks
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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