DocumentCode :
1303573
Title :
Achievable Rate Region under Joint Distributed Beamforming and Power Allocation for Two-Way Relay Networks
Author :
ShahbazPanahi, Shahram ; Dong, Min
Author_Institution :
Dept. of Electr. Comput. & Software Eng., Univ. of Ontario Inst. of Technol., Oshawa, ON, Canada
Volume :
11
Issue :
11
fYear :
2012
fDate :
11/1/2012 12:00:00 AM
Firstpage :
4026
Lastpage :
4037
Abstract :
We obtain the achievable beamforming rate region for a two-way cooperative network consisting of two transceivers and multiple relays, all single-antenna nodes. Assuming that the relay beamforming weights as well as the transceiver transmit powers are the design parameters, this region is characterized under a constraint on the total (network) transmit power consumption. Using the shape of the rate region, we then use a sum-rate maximization approach to obtain the jointly optimal relay beamforming weights and transceiver transmit powers. Interestingly, we show that the sum-rate maximization approach yields the same solution as the max-min fair design approach does. Using this relationship, we further present a semi-closed-form solution to the underlying distributed beamforming problem. We then prove that the transmit power of any of the two transceivers can be obtained as the solution to a one-dimensional optimization problem using a simple bisection method which enjoys a low computational complexity. Furthermore, we extend these results to obtain the relay beamforming weights and transceiver transmit powers corresponding to any point on the boundary of the rate region, through a weighted sum-rate maximization approach.
Keywords :
antennas; array signal processing; communication complexity; cooperative communication; minimax techniques; power consumption; radio transceivers; beamforming rate region; bisection method; computational complexity; design parameter; distributed beamforming; max-min fair design; one-dimensional optimization problem; optimal relay beamforming; power allocation; power consumption; single-antenna node; sum-rate maximization approach; transceiver transmit power; two-way cooperative network; two-way relay network; Array signal processing; Linear programming; Optimization; Relays; Signal to noise ratio; Transceivers; Vectors; SNR balancing; Two-way relaying; cooperative network; distributed beamforming; power control;
fLanguage :
English
Journal_Title :
Wireless Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
1536-1276
Type :
jour
DOI :
10.1109/TWC.2012.092112.112072
Filename :
6317113
Link To Document :
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