Title :
A multiplicative weight perturbation scheme for distributed beamforming in wireless relay networks with 1-bit feedback
Author :
Fertl, Peter ; Hottinen, Ari ; Matz, Gerald
Author_Institution :
Inst. of Commun. & Radio-Freq. Eng., Vienna Univ. of Technol., Vienna
Abstract :
This paper focuses on perturbation-based distributed beamforming with 1-bit feedback for wireless amplify-and-forward relay networks. We propose to use multiplicative perturbations based on Givens rotations to adapt the beamforming weights while guaranteeing a sum power constraint for the relays. This perturbation scheme is shown to be computationally efficient and easy to design, thus allowing for low-complexity relay nodes. An adaptation of the Givens rotation angle allows to approach optimum performance arbitrarily close. Numerical simulations demonstrate noticeable performance gains over additive perturbation schemes that have been exclusively considered up to now.
Keywords :
array signal processing; perturbation techniques; radio access networks; relays; 1-bit feedback; additive perturbation; distributed beamforming; low complexity relay nodes; multiplicative weight perturbation; sum power constraint; wireless amplify-and-forward relay networks; Array signal processing; Communication system control; Fading; Feedback; Gaussian noise; Intelligent networks; Numerical simulation; Radio frequency; Relays; Statistical distributions; Givens rotation; amplify-and-forward; distributed beamforming; feedback; relay network;
Conference_Titel :
Acoustics, Speech and Signal Processing, 2009. ICASSP 2009. IEEE International Conference on
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-2353-8
Electronic_ISBN :
1520-6149
DOI :
10.1109/ICASSP.2009.4960161