Sequential Decoding of Time-Varying Convolutional Codes.
NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
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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