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Adaptive Hybrid Beamformer Suitable for Fast Fading  

Ahn Jang Hwan (School of Electronic & Electrical Engineering, Kyugpook National University)
Han Dong Seog (School of Electronic & Electrical Engineering, Kyugpook National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.42, no.2, 2005 , pp. 49-59 More about this Journal
Abstract
An adaptive hybrid beamformer is proposed to improve the reception performance of the advanced television system committee (ATSC) digital television (DTV) in a mobile environment. Dynamic multipaths and Doppler shifts severely degrade the reception performance of the ATSC DTV receiver. Accordingly, a hybrid beamformer, called a Capon and least mean square (CLMS) beamformer, is presented that uses direction of arrival (DOA) information and the least mean square (LMS) beamforming algorithm. The proposed CLMS algerian efficiently removes dynamic multipaths and compensates for the phase distortion caused by Doppler shifts in mobile receivers. After the CLMS beamformer is operated, the subsequent use of an equalizer removes any residual multipath effects, thereby significantly improving the performance of DTV receivers. The performances of the proposed CLMS, Capon, and LMS beamformersare compared based on computer simulations. In addition, the overall performance of the CLMS beamformer followed by an equalizer is also considered.
Keywords
digital television; adaptive beamforming; equalization;
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