Title :
An Optimized Cooperative Beamforming Scheme in MIMO Relay Broadcast Channels
Author :
Zhou, Zhendong ; Vucetic, Branka
Author_Institution :
Sch. of Electr. & Inf. Eng., Univ. of Sydney, Sydney, NSW, Australia
Abstract :
We consider relay broadcast channels (RBCs) with multiple antennas at all nodes. A practical linear preceding, relaying and combining scheme is proposed. Under an overall power constraint, we derive the optimal power allocation solution in a closed form. A low complexity beamforming vector optimization algorithm is proposed to maximize the effective channel gains and improve the system performance. Simulation results are presented for various channel configurations, which show that the proposed optimized beamforming algorithm achieves performance very close to that of the exhaustive search algorithm but with a much lower complexity, and the maximum diversity gain is always attained.
Keywords :
MIMO communication; antenna arrays; array signal processing; broadcast channels; diversity reception; optimisation; MIMO relay broadcast channels; channel configurations; maximum diversity gain; multiple antennas; optimal power allocation; optimization algorithm; optimized cooperative beamforming scheme; power constraint; Antenna theory; Array signal processing; Broadcasting; Diversity methods; MIMO; Peer to peer computing; Power system relaying; Receiving antennas; Relays; Transmitting antennas;
Conference_Titel :
Global Telecommunications Conference, 2009. GLOBECOM 2009. IEEE
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-4244-4148-8
DOI :
10.1109/GLOCOM.2009.5426130