Accession Number : AD0741146

Title :   Sequential Decoding of Time-Varying Convolutional Codes.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Lerich,Barry Harold

Report Date : DEC 1971

Pagination or Media Count : 72

Abstract : A discussion of convolutional encoding and sequential decoding is given as background for the experimental phase of the 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. (Author)

Descriptors :   (*CODING, DATA TRANSMISSION SYSTEMS), DECODING, SEQUENTIAL ANALYSIS, POWER SERIES, SHIFT REGISTERS, MATRICES(MATHEMATICS), PROBABILITY DENSITY FUNCTIONS, FEEDBACK, WHITE NOISE, COMPUTER PROGRAMMING, ERRORS, CURVE FITTING, THESES

Subject Categories : Cybernetics

Distribution Statement : APPROVED FOR PUBLIC RELEASE