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Sullivan's recent extension of Gallager's time diversity encoding scheme for combating bursts when there are errors in the guard space is based on the concept of one convolutional code that is contained in another. This paper shows that Sullivan's necessary and sufficient conditions for containment imply a simple factorization of the contained code. Implications for code design, encoders, and decoders for burst- and random-error channels are noted.
Date of Publication: May 1972