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This paper considers on - off random access channels where users transmit either a one or a zero to a base station. Such channels represent an abstraction of control channels used for scheduling requests in third-generation cellular systems and uplinks in wireless sensor networks deployed for target detection. This paper introduces a novel convex-optimization-based scheme for MUltiuser Detection (MUD) in asynchronous on - off random access channels that does not require knowledge of the delays or the instantaneous received signal-to-noise ratios of the individual users at the base station.
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