Optimal type-B1 convolutional codes of rate 4/5

It is reported that two optimal type-B1 burst correcting convolutional codes of rate 4/5 were found by computer search. The B/sub 0/ matrices of these codes are given. In octal, the columns are written as (53,357,756,1555,1000) and (53,357,1555,1203,1000), respectively.<
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