Sequential decoding of time-varying convolutional codes.

Download
Author
Lerich, Barry Harold
Date
1971-12Advisor
Geist, John M.
Metadata
Show full item recordAbstract
A discussion of convolutional encoding and sequential
decoding is given as background for the experimental phase
of this research. A modified stack algorithm is programmed
to simulate a sequential decoder for use in the study of
time-varying convolutional codes.
The decoder simulator is used to analyze the structure
of codes with the aim of finding a systematic method by
which to construct time-varying convolutional codes with
good decoding properties. Some difficulties in construction
techniques are discussed.
Extensive computer simulation comparing decoding performance
of time-varying codes to that of fixed codes Is
reported. The conclusion of these comparisons is that the
time-varying codes studied thus far are of theoretical
interest only.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
Related items
Showing items related by title, author, creator and subject.
-
Application of the computer for real time encoding and decoding of cyclic block codes
Cetinilmaz, Nizamettin (1975-12);This thesis is concerned with cyclic block codes which can "be used for the detection and correction of errors in a transmitted message which are produced "by various types of noise. Computer programs were developed and ... -
Performance analysis of variable code rate signals transmitted over frequency-nonselective, slowly fading channels in a pulse-interference environment
Shih, Wan-Chun (Monterey California. Naval Postgraduate School, 2005-09);Wireless systems, including wireless local area networks (WLAN) and cellular networks, are increasingly being used for both commercial and military applications. For military applications, it is important to analyze the ... -
Hybrid hard and soft decision decoding of Reed-Solomon codes for M-ARY frequency-shift keying
Spyridis, Konstantinos (Monterey, California. Naval Postgraduate School, 2010-06);All modern communication systems use some form of forward error correction coding. Generally, coding gain is improved when soft decision decoding is used instead of hard decision decoding. While soft decision decoding is ...