Open Access

Employing Coordinated Transmit and Receive Beamforming in Clustering Double-Directional Radio Channel

EURASIP Journal on Wireless Communications and Networking20072007:057175

https://doi.org/10.1155/2007/57175

Received: 31 October 2006

Accepted: 1 August 2007

Published: 16 October 2007

Abstract

A novel beamforming (BF) system that employs two switched beam antennas (SBAs) at both ends of the wireless link in an indoor double-directional radio channel (DDRC) is proposed. The distributed directivity gain (DDG) and beam pattern correlation in DDRC are calculated. The channel capacity of the BF system is obtained from an analytical model. Using the channel capacity and outage capacity as performance measures, we show that the DDG of the BF system directly increases the average signal-to-noise ratio (SNR) of the wireless link, thus achieving a direct increase of the ergodic channel capacity. By jointly switching between different pairs of transmit (Tx) and receive (Rx) directional beam patterns towards different wave clusters, the system provides diversity gain to combat against multipath fading, thus reducing the outage probability of the random channel capacity. Furthermore, the performance of the BF system is compared with that of a multiple-input multiple-output (MIMO) system that is set up using linear antenna arrays. Results show that in a low-SNR environment, the BF system outperforms the MIMO system in the same clustering DDRC.

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Authors’ Affiliations

(1)
ATR Wave Engineering Laboratories
(2)
Department of Information and Computer Sciences, Toyohashi University of Technology

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Copyright

© Chen Sun et al. 2007

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.