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...

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Vydáno v:IEEE transactions on wireless communications Ročník 13; číslo 10; s. 5481 - 5495
Hlavní autoři: Enlong Che, Hoang Duong Tuan, Nguyen, Ha H.
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York IEEE 01.10.2014
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
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
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Shrnutí: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.
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ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2014.2324588