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• W2964124428 abstract "We establish a multiuser extrinsic information transfer (EXIT) chart area theorem for the interleave-division multiple access (IDMA) scheme, a special form of superposition coding, in multiple access channels (MACs). A low-cost multi-user detection (MUD) based on the Gaussian approximation (GA) is assumed. The evolution of mean-square errors (MSE) of the GA-based MUD during iterative processing is studied. We show that the K-dimensional tuples formed by the MSEs of K users constitute a conservative vector field. The achievable rate is a potential function of this conservative field, so it is the integral along any path in the field with value of the integral solely determined by the two path terminals. Optimized codes can be found given the integration paths in the MSE fields by matching EXIT type functions. The above findings imply that i) low-cost GA detection can provide near capacity performance, ii) the sum-rate capacity can be achieved independently of the integration path in the MSE fields; and iii) the integration path can be an extra degree of freedom for code design." @default.
• W2964124428 created "2019-07-30" @default.
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• W2964124428 date "2019-07-25" @default.
• W2964124428 modified "2023-09-24" @default.
• W2964124428 title "Achievable Rate Region for Iterative Multi-User Detection via Low-cost Gaussian Approximation" @default.
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• W2964124428 doi "https://doi.org/10.48550/arxiv.1907.11518" @default.
• W2964124428 hasPublicationYear "2019" @default.
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