Doctoral Dissertations
Abstract
"At high data rates, bandwidth is more constraining than transmitting power. Twice the data can be transmitted in a given bandwidth by using quadrature phase-shift keyed (QPSK) modulation schemes as opposed to biphase phase-shift keyed (PSK) systems, with a corresponding factor of two increase in power required for identical bit-error-rate performance. At high data rates intersymbol interference due to media dispersion degrades receiver performance . Other degradation results from interchannel interference, co-channel interference and noise may also be present in typical situations.
Equalization is a technique by which the receiver performance in the presence of intersyrnbol interference can be improved. Filtering at the transmitter and/or at the receiver reduces the interchannel interference but enhances intersyrnbol interference. By combined use of transmitter and/or receiver filtering and equalization at the receiver, an improvement in the overall performance can be obtained.
In this thesis, a basis for the design of a receiver filter and an equalizer is provided. The Gauss-quadrature rule integration method is used to obtain upper and lower bounds on the probability of error for the receiver including the equalizer. The signal-to-noise ratio improvement for various parameter values is then obtained to provide a basis for receiver design.
The performance of an adaptive linear equalizer is compared with that of a maximum-likelihood sequence estimator with Viterbi algorithm. It is shown that maximum-likelihood sequence estimator is superior in performance to an adaptive linear equalizer when the received signal is subject to both intersymbol and interchannel interferences"- Abstract, pp. ii-iii
Advisor(s)
Ziemer, Rodger E.
Committee Member(s)
Tranter, William H.
Taylor, Javin M.
Cunningham, David R.
Engelhardt, Max
Department(s)
Electrical and Computer Engineering
Degree Name
Ph. D. in Electrical Engineering
Publisher
University of Missouri--Rolla
Publication Date
1975
Pagination
xi, 246 pages
Note about bibliography
Includes bibliographical references (pages 83-89)
Rights
© 1975 Srinivasa H. R. Raghavan, All rights reserved.
Document Type
Dissertation - Open Access
File Type
text
Language
English
Thesis Number
T 3057
Print OCLC #
6013488
Recommended Citation
Raghavan, Srinivasa H. R., "Use of adaptive linear equalization and maximum-likelihood sequence estimation in conjunction with filtering to improve QPSK communication in intersymbol and interchannel interference channels" (1975). Doctoral Dissertations. 264.
https://scholarsmine.mst.edu/doctoral_dissertations/264
