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We propose efficient coding schemes for two communication settings: 1) asymmetric channels and 2) channels with an informed encoder. These settings are important in non-volatile memories, as well as optical and broadcast communication. The schemes are based on non-linear polar codes, and they build on and improve recent work on these settings. In asymmetric channels, we tackle the exponential storage...
We introduce a family of binary prefix condition codes in which each codeword is required to have a Hamming weight which is a multiple of w for some integer w ?? 2. Such codes have intrinsic error resilience and are a special case of codes with codewords constrained to belong to a language accepted by a deterministic finite automaton. For a given source over n symbols and parameter w we offer an algorithm...
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