DocumentCode :
345877
Title :
Adaptive beamforming for high bit rate services in the FDD mode of UTRA
Author :
Mestre, Xavier ; Nájar, Montse ; Antón, Carles ; Fonollosa, Javier R.
Author_Institution :
Dept. de Teoria del Senyal i Comunicacions, Univ. Politecnica de Catalunya, Barcelona, Spain
Volume :
4
fYear :
1999
fDate :
1999
Firstpage :
1951
Abstract :
Most time-reference beamforming algorithms suffer from severe beampattern distortion effects when applied to high bit rate services in WCDMA, causing serious performance degradation in terms of output BER, especially at high input SINR levels. These shortcomings are essentially caused by the uplink multiplexing of the traffic channel, which is seen by the base station as a powerful interfering source coming from the direction of arrival of the desired user. In this paper, a semi-blind beamforming technique is proposed as a valid solution to overcome this effect. The suggested scheme resorts to a conditional maximum likelihood approach to the underlying estimation problem and is designed to operate in an iterative fashion
Keywords :
array signal processing; cellular radio; error statistics; frequency division multiplexing; iterative methods; maximum likelihood estimation; radio access networks; telecommunication channels; telecommunication traffic; FDD mode; UMTS terrestrial radio access; UTRA; WCDMA; adaptive beamforming; base station; beampattern distortion effects; conditional maximum likelihood approach; frequency division duplex; high bit rate services; input SINR levels; iterative method; output BER; semi-blind beamforming technique; time-reference beamforming algorithms; traffic channel; uplink multiplexing; Array signal processing; Base stations; Bit error rate; Bit rate; Channel estimation; Degradation; Filtering; Multiaccess communication; Partial transmit sequences; Signal to noise ratio;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference, 1999. VTC 1999 - Fall. IEEE VTS 50th
Conference_Location :
Amsterdam
ISSN :
1090-3038
Print_ISBN :
0-7803-5435-4
Type :
conf
DOI :
10.1109/VETECF.1999.797278
Filename :
797278
Link To Document :
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