Title :
Hybrid diversity-beamforming technique for outage probability minimization in spatially correlated channels
Author :
Hojoong Kwon ; Byeong Gi Lee
Author_Institution :
Sch. of Electr. Eng. & INMC, Seoul Nat. Univ., Seoul, South Korea
Abstract :
In this paper, we present a hybrid multi-antenna technique that can minimize the outage probability by combining the diversity and beamforming techniques. The hybrid technique clusters the transmission antennas into multiple groups and exploit diversity among different groups and beamforming within each group. We analyze the performance of the resulting hybrid technique for an arbitrary correlation among the transmission antennas. Through the performance analysis, we derive a closed-form expression of the outage probability for the hybrid technique. This enables to optimize the antenna grouping for the given spatial correlation. We show through numerical results that the hybrid technique can balance the trade-offs between diversity and beamforming according to the spatial correlation and that the optimally designed hybrid technique yields a much lower outage probability than the diversity or beamforming technique does in partially correlated fading channels.
Keywords :
array signal processing; correlation methods; diversity reception; fading channels; minimisation; probability; transmitting antennas; antenna grouping optimization; closed-form expression; hybrid diversity-beamforming technique; hybrid multiantenna technique; outage probability minimization; performance analysis; spatially correlated channels; transmission antennas; Array signal processing; Correlation; Diversity reception; Receiving antennas; Signal to noise ratio; Transmitting antennas; Beamforming; diversity; hybrid technique; outage probability; spatial correlation;
Journal_Title :
Communications and Networks, Journal of
DOI :
10.1109/JCN.2007.6182855