Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.573146
Title: Study of the ultra-wideband (UWB) communication network co-existence with other wireless technologies
Author: Feng, Dong
Awarding Body: University of the West of England, Bristol
Current Institution: University of the West of England, Bristol
Date of Award: 2011
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Abstract:
This thesis presents the detailed investigation of the Ultra- Wideband (UWB) high speed short-range wireless communications. The research has thoroughly examined many unexplored sensitive issues such as waveform design, i.e., using high derivatives Gaussian functions to control the power spectral density (PSD) to avoid the interference, changeable pulse duration to meet the bandwidth requirements and anti-interference ability with both high Gaussian derivatives and M-band modulation of UWB systems. A general UWB channel model has been examined to analyze the sensitive parameters such as the signal synchronization, channel estimation and detection using simulation methods. This carried out a deep investigation of the correlation of the noise in the captured multi-path energy and then provided an improved maximal ratio (IMR) algorithm to evaluate the weights of the rake combiner in a dense multi-path indoor UWB channel. The simulation results shown IMR combine (when used with equalizer) may be considered better than others while using for UWB channel model (CM-l and CM-2), and has the similar performance as Minimum Mean Square Error (MMSE). MMSE is one of the well- performed algorithms but on the other hands it requires a complicated hardware design. In order to overcome the interference in multi-user UWB communication system, the multiple users UWB system model based-on the packets collision was tested using simulation of ad-hoc networks. It proved that the effects of varied users numbers and multiple user interference (MUI) processing are the key factors to overcome the system performance and suggested for use to guide the designers and planners of the UWB Ad-hoc networks. Also, the adverse effects of the synthesis interference of UWB devices on the other mobile and wireless communication systems and vice versa hav~~¥n explored while examining the existing UWB emission mask standards. The bit error ratio (BER) formula for the interfered UWB system was derived to demonstrate the relationship between the UWB anti-interference ability and its parameters. This examination revealed that adjusting the signal gain can improve the performance in terms of anti-interference capability. Finally, the results of all the above-mentioned investigations are presented and discussed to prove that emerging the high speed UWB Systems in the 4th G mobile systems and also their coexistence alongside the present and future wireless and mobile communication systems are possible in practice and also very advantageous.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.573146  DOI: Not available
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