Title :
An Optimal Multiuser Beamforming Scheme Based on the Worst SNR in Cellular Systems
Author :
Wang, Da ; Bai, Lin ; Chen, Chen ; Guan, Wenyang ; Jin, Ye ; Choi, Jinho
Author_Institution :
Sch. of Electron. Eng. & Comput. Sci., Peking Univ., Beijing, China
Abstract :
In the future cellular communication systems, multiple relay nodes can be used for distributed virtual multiple-input multiple-output (MIMO) beamforming to improve the performance of downlink transmissions. In this paper, we study a distributed relay scheme in cellular systems which consists of a base station (BS), multiple amplify-and-forward (AF) relay nodes, and multiple users. We propose an optimal distributed relay beamforming scheme that maximizes the worst-case received signal-to-noise ratio (SNR) under two different types of power constraints, which are the total relay transmit power constraint and individual relay transmit power constraints. We show that the distributed relay beamforming solution for multiusers can be obtained optimally by solving second-order cone programming (SOCP) problems. Numerical results validate our theoretical analysis and demonstrate an effective gain of the proposed scheme over other conventional schemes.
Keywords :
MIMO communication; amplify and forward communication; array signal processing; cellular radio; base station; cellular systems; distributed virtual multiple-input multiple-output beamforming; downlink transmissions; future cellular communication systems; individual relay transmit power constraints; multiple amplify-and-forward relay nodes; multiple relay nodes; optimal distributed relay beamforming scheme; optimal multiuser beamforming scheme; second-order cone programming problems; total relay transmit power constraint; worst SNR; worst-case received signal-to-noise ratio; Array signal processing; Educational institutions; MIMO; Optimization; Relays; Resource management; Signal to noise ratio;
Conference_Titel :
Vehicular Technology Conference (VTC Spring), 2012 IEEE 75th
Conference_Location :
Yokohama
Print_ISBN :
978-1-4673-0989-9
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2012.6239900