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A STUDY OF THE RECEPTION OF CO-DIRECTIONAL USERS USING BEAMFORMING, SWITCHED BEAMS AND MULTIUSER DETECTION STATEGIES

by RADHAKRISHNAN, RAJESH

Abstract (Summary)
Spatial filtering and space-time processing algorithms have been proposed for implementation in wideband code division multiple access (WCDMA) systems, as a means of increasing both the capacity of the cellular system and the quality of service. Spatial filtering is achieved using smart antennas, which can be classified into the following two genres: adaptive antenna arrays and the switched beam concept. When faced with the scenario of co-directional users, using beamforming or switched beams alone is not the best strategy, in terms of the performance measure - the received bit error rate. The signals from the co-directional users are accepted by the main lobe of the desired user’s antenna pattern and is seen as interference when demodulating the desired user’s signal. Selective multiuser detection, applied after the above reception strategies, can be used to mitigate against these interferers and provide a significant performance enhancement. A ‘Smart Antenna Simulation Environment’, a graphical user interface, was designed using Matlab, to carry out the simulation analysis. Simulation studies done in this thesis show that switched beams with the decorrelating detector performs just as well and in some cases better than recursive least squares (RLS) beamforming with the decorrelating detector, when receiving co-directional users at the base station.
Bibliographical Information:

Advisor:

School:University of Cincinnati

School Location:USA - Ohio

Source Type:Master's Thesis

Keywords:smart antennas beamforming switched beams decorrelator multiuser detection

ISBN:

Date of Publication:01/01/2002

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