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

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 perfo...

Full description

Saved in:
Bibliographic Details
Published in:Wireless personal communications 2014, Vol.74 (2), p.789-802
Main Authors: Kim, Kyunghoon, Yang, Hyunwook, Choi, Seungwon
Format: Article
Language:English
Subjects:
Algorithms
Antennas
Applied sciences
Blocking
Coding, codes
Communications Engineering
Complexity
Computer Communication Networks
Computer simulation
Engineering
Exact sciences and technology
Expenses
Information, signal and communications theory
Networks
Radiocommunications
Receiving
Searching
Signal and communications theory
Signal,Image and Speech Processing
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Teletraffic
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 ( 2 M ) times.
ISSN:0929-6212
1572-834X
DOI:10.1007/s11277-013-1321-7