Title :
Robust distributed beamforming for two-way wireless relay systems
Author :
Li, Chunguo ; Yang, Luxi ; Zhu, Wei-Ping
Author_Institution :
Sch. of Inf. Sci. & Eng., Southeast Univ., Nanjing, China
fDate :
May 30 2010-June 2 2010
Abstract :
In this paper, a robust optimal distributed relay beamforming scheme is presented for two-way wireless relay systems with two sources (one base station and one mobile terminal) and multiple relays, each having a single antenna. Considering that the perfect channel state information (CSI) between the mobile terminal and the relays is usually not available, the new beamforming problem, based on the minimization of the sum MSE (mean squared error) subject to a total relay power, is formulated such that only the CSI between the base station and the relays is required. The constrained beamforming optimization problem is then solved by the Lagrangian multiplier method, leading to a closed-form solution for the distributed relay beamforming. Monte Carlo simulations show that the proposed scheme performs better than the conventional relaying method in terms of both sum rate and the bit-error-rate (BER).
Keywords :
Monte Carlo methods; array signal processing; error statistics; mean square error methods; mobile antennas; optimisation; radio networks; wireless channels; Lagrangian multiplier method; Monte Carlo simulations; bit-error-rate; channel state information; constrained beamforming optimization problem; mean squared error; robust optimal distributed relay beamforming scheme; single antenna; sum MSE; sum rate; two-way wireless relay systems; Array signal processing; Base stations; Channel state information; Closed-form solution; Constraint optimization; Lagrangian functions; Mobile antennas; Power system relaying; Relays; Robustness;
Conference_Titel :
Circuits and Systems (ISCAS), Proceedings of 2010 IEEE International Symposium on
Conference_Location :
Paris
Print_ISBN :
978-1-4244-5308-5
Electronic_ISBN :
978-1-4244-5309-2
DOI :
10.1109/ISCAS.2010.5537974