Joint Optimization of Cooperative Beamforming and Relay Assignment in Multi-User Wireless Relay Networks

This paper considers joint optimization of cooperative beamforming and relay assignment for multi-user multi-relay wireless networks to maximize the minimum of the received signal-to-interference-plus-noise ratios (SINR). Separated continuous optimization of beamforming and binary optimization of re...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on wireless communications Vol. 13; no. 10; pp. 5481 - 5495
Main Authors: Enlong Che, Hoang Duong Tuan, Nguyen, Ha H.
Format: Journal Article
Language:English
Published: New York IEEE 01.10.2014
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Array signal processing
Beamforming
Interference
Joints
Mathematical analysis
Mathematical models
Optimization
Optimization algorithms
Relay
Relay networks
Relays
Signal to noise ratio
Wireless communication
Wireless networks
power allocation
relay assignment
wireless relay networks
Cooperative beamforming
d.c. programming
relay selection
ISSN:1536-1276, 1558-2248
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This paper considers joint optimization of cooperative beamforming and relay assignment for multi-user multi-relay wireless networks to maximize the minimum of the received signal-to-interference-plus-noise ratios (SINR). Separated continuous optimization of beamforming and binary optimization of relay assignment already pose very challenging programs. Certainly, their joint optimization, which involves nonconvex objectives and coupled constraints in continuous and binary variables, is among the most challenging optimization problems. Even the conventional relaxation of binary constraints by continuous box constraints is still computationally intractable because the relaxed program is still highly nonconvex. However, it is shown in this paper that the joint programs fit well in the d.c. (difference of two convex functions/sets) optimization framework. Efficient optimization algorithms are then developed for both cases of orthogonal and nonorthogonal transmission by multiple users. Simulation results show that the jointly optimized beamforming and relay assignment not only save transmission bandwidth but can also maintain well the network SINRs.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 14
ObjectType-Article-1
ObjectType-Feature-2
content type line 23
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2014.2324588