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Title: Realistic physical layer performance evaluations for indoor and outdoor wireless communication systems
Author: Kong, Di
ISNI:       0000 0004 5994 9237
Awarding Body: University of Bristol
Current Institution: University of Bristol
Date of Award: 2016
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Radio system parameters, antennas, the propagation are of fundamental importance in order to ensure good wireless communication performance. It is important to analyse the performance of wireless systems in realistic environments and under realistic assumptions. Over-simplifying these assumptions can lead to inaccurate conclusions. This thesis presents a comprehensive PHY layer performance analysis for a range of wireless communication systems in realistic indoor and outdoor environments. A method is developed to evaluate and ultimately optimise wireless communication systems by combining measured and modelled antenna characteristics, state-of-the-art propagation models for indoor and outdoor environments, and sophisticated PHY layer simulators. This combined simulator is capable of analysing millions of radio links and packet transmissions. A number of questions for designing reliable and high data rate wireless networks are then addressed utilising this new method. An end-to-end solution to evaluate and optimise the design of indoor WLAN systems is proposed. Theoretical studies show that directional antennas increase link sensitivity to orientation; however for 835"0 of locations and orientations throughput enhancement is still observed. It is shown that with optimum antenna selection the performance of 2x2 beamforming is competitive, especially when directional antennas are used at low signal to noise ratios. It is also shown that mesh networks improve in-home coverage better than 3x3 MIMO systems when the same number of radio chains are assumed. A antenna selection is shown to provide better coverage than power-restricted beamforming, resulting in approximately 50% higher throughput in the most difficult channels. An outdoor interference study was performed by considering the impact of high repetition rate low-frequency airborne radar systems on the performance of Digital Video Broadcasting - Terrestrial (DVB-T/T2). It is shown the degree of interference is significantly affected by the polarisation and direction of the antennas. It is also shown that radar interference on a DVB-TfT2 system can be reduced by flattening the perceived radar spectrum. This can be achieved by increasing the radar repetition rate or by increasing the FFT size of the OFDM system.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available