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UWB INDOOR DIFFUSION CHANNEL MODEL
AND ITS APPLICATION TO RECEIVER DESIGN
by
Majid Nemati Anaraki
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Ful¯llment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(ELECTRICAL ENGINEERING)
May 2007
Copyright 2007 Majid Nemati Anaraki
Object Description
| Title | UWB indoor diffusion channel model and its application to receiver design |
| Author | Anaraki, Majid Nemati |
| Author email | nematian@usc.edu |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Electrical Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2007-01-17 |
| Date submitted | 2007 |
| Restricted until | Unrestricted |
| Date published | 2007-03-06 |
| Advisor (committee chair) | Scholtz, Robert A. |
| Advisor (committee member) |
Mitra, Urbashi Lindsey, William C. Baxendale, Peter |
| Abstract | Many design efforts in Ultra-wideband (UWB) communication need information about the channel power profile and delay spread. For example, power profile provides important information for UWB ranging, transmitted reference (TR) and square-law detector designs. In this study an analytic diffusion model for UWB indoor channel is proposed. The channel model was analytically derived based on diffusion phenomenon and a set of stochastic differential equations (SDE). It was hypothesized that the multiple wave reflections in the rich scatter indoor environment cause a diffusion-like energy behavior. The resulted Markov process has the statistics of a geometric Wiener (geometric Brownian motion) process. The approach considers the channel in continuous-timespace with fewer parameters compared to characterizing thediscrete multipath components.; Some applications of the proposed channel model in UWB signal filtering and receiver design were considered. The results on filter design show increased Signal-to-noise ratio (SNR) and signal to interference plus noise ratio (SINR) at the presence of narrow band interference (NBI) without any information about the interference. For applications with inexpensive receiver requirement (e.g., IEEE802.15.4a), a modified energy detector (ED) receiver was proposed.; A challenging task in UWB ED and TR receivers is to determine the optimum integration length. The analysis of channel delay spread based on the diffusion model was used to determine the optimum integration interval in TR and ED receivers for impulse radio UWB. It was shown that the optimum stopping time (in terms of effective SNR of the decision variable) which minimizes the bit error probability can be obtained in a computationally inexpensive algorithm without precise information about the channel model parameters. The method can be effectively implemented even with analog components. The optimization is conducted in real time, based on a particular realization of the channel. As such, the new method offers performance superior to schemes based on optimizing on averaged statistics. The optimality of the estimated stopping time is preserved even in the presence of some synchronization errors. |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m309 |
| Rights | Anaraki, Majid Nemati |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-Anaraki-20070306 |
| Archival file | uscthesesreloadpub_Volume23/etd-Anaraki-20070306.pdf |
Description
| Title | Page 1 |
| Full text | UWB INDOOR DIFFUSION CHANNEL MODEL AND ITS APPLICATION TO RECEIVER DESIGN by Majid Nemati Anaraki A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Ful¯llment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (ELECTRICAL ENGINEERING) May 2007 Copyright 2007 Majid Nemati Anaraki |
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