Joint Optimization of Source Power Allocation and Cooperative Beamforming for SC-FDMA Multi-User Multi-Relay Networks

• Published in: IEEE transactions on communications Vol. 61; no. 6; pp. 2248 - 2259
• Main Authors: Kha, H. H., Tuan, H. D., Nguyen, H. H.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.06.2013; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Access methods and protocols, osi model; Algorithms; Allocations; Applied sciences; Array signal processing; Beamforming; Computational efficiency; cooperative beamforming; d.c. programming; Detection, estimation, filtering, equalization, prediction; Exact sciences and technology; Frequency division multiple access; global optimization; Information, signal and communications theory; Interference; joint optimization; Joints; Mathematical models; max-min optimization; Networks; OFDM; Optimization; power allocation; Relay; Relays; Resource management; SC-FDMA; Signal and communications theory; Signal, noise; Studies; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Teleprocessing networks. Isdn; Transmission and modulation (techniques and equipments); Wireless relay networks; joint optimization; Relaying; Relay; Relay network; Noise reduction; Frequency division multiple access; Iterative method; Power allocation; Convex programming; Variable transformation; Beam forming; Optimization; Routing protocols; Convexity; Deterministic approach; Multiple access; Branch and bound method; d.c programming; Transmission protocol; Global optimum; Single carrier; Wireless relay networks; Algorithm; global optimization; Interference suppression; max-min optimization; Carrier frequency; cooperative beamforming; SC-FDMA; Signal to interference plus noise ratio
• ISSN: 0090-6778; 1558-0857
• DOI: 10.1109/TCOMM.2013.041113.120480

This paper is concerned with design problems of joint source power allocation and relay beamforming in multi-user multi-relay networks that use single-carrier frequency division multiple access (SC-FDMA) and amplify-and-forward relaying. Examined are the joint programs of (i) maximizing the minimum signal-to-interference-plus-noise ratio (SINR) under various transmitted power constraints, and (ii) minimizing the total transmitted power subject to prescribed SINR thresholds of users. Although these optimization problems are highly nonconvex and have large dimensions, by exploiting their partial convexities and making elegant nonlinear variable changes, they are recast as d.c. (difference of two convex) programs. Efficient d.c. iterative procedures are then developed to find the solutions. Simplified joint programs under the two cases of equal source power and equal relay beamforming weights, respectively, are also considered. Branch-and-bound algorithms of deterministic global optimization are then proposed for solving the simplified joint programs. Simulation results confirm the excellent performance and computational efficiency of all the proposed solutions.