On the reversibility of Iwadare-type-B1 recurrent codes (Corresp.)
Harry T. Hsu · IEEE Transactions on Information Theory · 1971
This correspondence will show that Iwadare-type-B1recurrent codes [1] are reversible. They are capable of correcting the same set of burst error patterns in both directions--forwards and backwards. IfS(D)is the syndrome polynomial of Iwadare code sequences in the forward direction, thenD^L S^* (D)[where(L + 1)is the decoding delay andS^* (D), the reversed polynomial ofS (D)] is the syndrome polynomial of Iwadare code sequences in the backward direction. The circuit for the generation ofS(D)can be easily modified to generateD^L S^* (D). The decoders for both directions are essentially the same.