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Universal Communication—Part I: Modulo Additive Channels

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2 Author(s)
Yuval Lomnitz ; Department of Electrical Engineering-Systems, Tel-Aviv University, Ramat-Aviv, Israel ; Meir Feder

Which communication rates can be attained over a channel whose output is an unknown (possibly stochastic) function of the input that may vary arbitrarily in time with no a priori model? Following the spirit of the finite-state compressibility of a sequence, defined by Lempel and Ziv, a “capacity” is defined for such a channel as the highest rate achievable by a designer knowing the particular relation that indeed exists between the input and output for all times, yet is constrained to use a fixed finite-length block communication scheme without feedback, i.e., use the same encoder and decoder over each block. In the case of the modulo additive channel, where the output sequence is obtained by modulo addition of an unknown individual sequence to the input sequence, this capacity is upper bounded by a function of the finite state compressibility of the noise sequence. A universal communication scheme with feedback that attains this capacity universally, without prior knowledge of the noise sequence, is presented.

Published in:

IEEE Transactions on Information Theory  (Volume:59 ,  Issue: 9 )