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Complementary Beamforming Method Increasing Throughput in ECMA UWB AAS Systems  

Kim, Seok-Hyeon (인하대학교 전자공학과)
Ji, Young-Gun (인하대학교 전자공학과)
Lee, Hong-Won (인하대학교 전자공학과)
Chung, Jae-Hak (인하대학교 전자공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.32, no.8A, 2007 , pp. 827-835 More about this Journal
Abstract
In this paper, the extension method of data transmission range as adapting AAS(Adaptive Antenna Systems) in ECMA(European Computer Manufacturers Association) standard MB-OFDM(MultiBand-Orthogonal Frequency Division Multiplexing) UWB systems is proposed, and the complementary beamforming method which can solve hidden beam problem when we adapt AAS in CSMA/CA(Carrier Sense Multiple Access with Collision Avoidance) systems is proposed. To design the complementary beamforming, Gram-Schmidt orthogonalization is utilized, whose beam pattern exhibits perfect nulling at the main beam angles and provides uniform power for detection of channel utilization out of main beam. The proposed method can be utilized with any arbitrary beamforming when we make main beamforming. Through computer simulation, it can be shown that proposed AAS and complementary beamforming increase data transmission range from 2m to 3.95m in 480Mbps data transmission system and increase throughput about 20% as compared with general UWB AAS systems.
Keywords
Complementary beamforming(CBF); UWB; AAS; CSMA/CA; MB-OFDM;
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