Implementation of burst-correcting convolutional codes

A general procedure is formulated for decoding any convolutional code with decoding delay
N
blocks that corrects all bursts confined to
r
or fewer consecutive blocks followed by a guard space of at least
N-1
consecutive error-free blocks. It is shown that all such codes can be converted to a form called "doubly systematic" which simplifies the decoding circuitry. The decoding procedure can then be implemented with a circuit of the same order of complexity as a parity-checking circuit for a block-linear code. A block diagram of a complete decoder is given for an optimal burst-correcting code. It is further shown that error propagation after a decoding mistake is always terminated by the occurrence of a double guard space of error-free blocks.