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Diversity and MIMO for body-centric wireless communication channels

Khan, Imdad (2009)
Ph.D. thesis, University of Birmingham.

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Abstract

Due to its increasing applications in personal communications systems, body-centric wireless communications has become a major field of interest for researchers. Fading and interference are the two concerns that affect the reliability and quality of service of wireless links. Diversity has been used to overcome these two problems. This thesis looks into the use of receive diversity for on-body channels. Space, pattern, and polarization diversity performance is analyzed and quantified by actual measurements in real environments. Significant diversity gains of up to 10 dB are achieved for most of the on-body channels. The on-body diversity channels have also been characterized by performing the statistical and spectral analyses. The fast fading envelope best fits the Rician distribution, with moderate K-factor values, and the slow fading envelope best fits the Log-normal distribution. Diversity has been found effective in the BAN-BAN interference rejection and significant rejection gain values are achieved. A new algorithm for BAN-BAN interference rejection has been proposed and compared with the conventional adaptive algorithms. The use of multiple antennas at both the transmitter and receiver end, i.e., MIMO has been investigated for on-body applications. It has been noticed that MIMO provides significant capacity increase for these channels despite the line-of-sight.

Type of Work:Ph.D. thesis.
Supervisor(s):Hall, Peter S.
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Electronics, Electrical & Computer Engineering
Keywords:On-body communications, diversity antennas, fading channels, propagation channels, MIMO systems
Subjects:TK Electrical engineering. Electronics Nuclear engineering
Institution:University of Birmingham
ID Code:433
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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