Trellis coded modulation applied to orthogonal signals.
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Authors
Stevens, Janet Emerson
Subjects
trellis coded modulation
orthogonal signals
M-ary frequency shift keying
Viterbi algorithm
orthogonal signals
M-ary frequency shift keying
Viterbi algorithm
Advisors
Ha, Tri T.
Date of Issue
1993-03
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
A method for the design of trellis codes for coherent detection of orthogonal signals in additive white Gaussian noise (AWGN) channels is presented. This method utilizes the landmark works of Ungerboeck in trellis coded modulation (TCM) . After examining the channel capacity, it is shown that a coding method requiring the same bandwidth efficiency for the orthogonal signal space and maximum likelihood (ML) soft decoding using the Viterbi algorithm can achieve large asymptotic coding gains. Several codes are analyzed using Ungerboeck' s technique of set-partitioning and mapping, then applying the analytic code description method of Calderbank and Mazo to M-ary frequency shift keying (M-FSK) . The general finding of this paper is that relative to uncoded modulation, asymptotic coding gains of 3-4 dB can be achieved.
Type
Thesis
Description
Series/Report No
Department
Electrical Engineering
Organization
Identifiers
NPS Report Number
Sponsors
Funding
Format
55 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.