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Feedback codes with uniformly bounded codeword lengths and zero-error capacities

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2 Author(s)
T. S. Han ; Dept. of Inf. Syst., Senshu Univ., Kawasaki, Japan ; H. Sato

A certain class of variable-length codes with feedback whose codeword lengths are uniformly upper bounded is considered. For this class of variable-length codes, it is shown that the zero-error capacity region for the, single-user and multiuser channels with feedback can be extended up to the ordinary average-error capacity under some conditions, if variable-length codes (semiblock codes) are used in place of fixed-length codes. This condition is different from that of M.V. Burnashev (1976) for variable-length codes with feedback but without any uniform bound on the codeword lengths. It is also shown that the capacity region for variable-length feedback codes coincides with that for fixed-length feedback codes.

Published in:

IEEE Transactions on Information Theory  (Volume:37 ,  Issue: 3 )