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• W2891505783 abstract "Adder MAC is a simple noiseless multiple-access channel (MAC), where if users send messages $X_1,ldots,X_hin {0,1}^n$, then the receiver receives $Y = X_1+cdots+X_h$ with addition over $mathbb{Z}$. Communication over the noiseless adder MAC has been studied for more than fifty years. There are two models of particular interest: uniquely decodable code tuples, and $B_h$-codes. In spite of the similarities between these two models, lower bounds and upper bounds of the optimal sum rate of uniquely decodable code tuple asymptotically match as number of users goes to infinity, while there is a gap of factor two between lower bounds and upper bounds of the optimal rate of $B_h$-codes. The best currently known $B_h$-codes for $hge 3$ are constructed using random coding. In this work, we study variants of the random coding method and related problems, in hope of achieving $B_h$-codes with better rate. Our contribution include the following. (1) We prove that changing the underlying distribution used in random coding cannot improve the rate. (2) We determine the rate of a list-decoding version of $B_h$-codes achieved by the random coding method. (3) We study several related problems about Renyi entropy." @default.
• W2891505783 created "2018-09-27" @default.
• W2891505783 creator A5062979441 @default.
• W2891505783 date "2018-09-19" @default.
• W2891505783 modified "2023-09-27" @default.
• W2891505783 title "Zero-error communication over adder MAC" @default.
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