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BACKWARD COMPATIBLE SIGNAL DESIGN FOR THROUGHPUT
IMPROVEMENT
by
Qiang Lin
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(ELECTRICAL ENGINEERING)
May 2008
Copyright 2008 Qiang Lin
Object Description
| Title | Backward compatible signal design for throughput improvement |
| Author | Lin, Qiang |
| Author email | q_lin@strongcycle.com |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Electrical Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2007-11-19 |
| Date submitted | 2008 |
| Restricted until | Unrestricted |
| Date published | 2008-01-29 |
| Advisor (committee chair) | Lindsey, William C. |
| Advisor (committee member) |
Weber, Charles L. Wang, Chuming |
| Abstract | We are living in a world that has constant demands for increasing communication channel throughput as new applications emerge every day. However, spectrum as a limited resource, cannot be allocated to new applications. On the other hand, existing applications are not utilizing the allocated bands to their maximum throughput. Naturally reusing the spectrum used by existing applications is considered. Since the existing applications cannot be disturbed in most of the cases, the reuse of the spectrum must be backward compatible with existing systems.; In this thesis, a backward compatible signal design technique for throughput improvement has been proposed. This technique exploits excessive Signal-to-Noise-Ratio in existing systems, and can improve system throughput at modest to high SNR. Signal model, potential improvement in throughput in terms of channel cutoff rate, and optimal receivers have been developed. It has been shown that in some cases, channel cutoff rate can be improved by 60%. |
| Keyword | cutoff rate; throughput; QPSK; modulation; coded modulation; MODEM; CODEC; signal constellation; error rate |
| 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 |
| Type | texts |
| Legacy record ID | usctheses-m1000 |
| Rights | Lin, Qiang |
| 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-Lin-20080129 |
| Archival file | uscthesesreloadpub_Volume32/etd-Lin-20080129.pdf |
Description
| Title | Page 1 |
| Full text | BACKWARD COMPATIBLE SIGNAL DESIGN FOR THROUGHPUT IMPROVEMENT by Qiang Lin A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (ELECTRICAL ENGINEERING) May 2008 Copyright 2008 Qiang Lin |
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