Convolutional Codes with Optimum Bidirectional Distance Profile
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In this paper we present tables of convolutional codes with an optimum bidirectional distance profile (OBDP), defined as the minimum of the distance profiles of the code and its corresponding "reverse" code. Such codes minimize the average complexity of bidirectional sequential decoding algorithms. The computer search is accelerated by the facts that optimum distance profile (ODP) codes of larger memory must have ODP codes of smaller memory as their "prefixes", and that OBDP codes can be obtained by "concatenating" ODP and reverse ODP codes of smaller memory.
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