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This paper studies the design of a decentralized multiuser multi-antenna(MIMO) system for spectrum sharing over a fixed narrow band, where thecoexisting users independently update their transmit covariance matrices forindividual transmit-rate maximization via an iterative manner. This designproblem was usually investigated in the literature by assuming that each usertreats the co-channel interference from all the other users as additional(colored) noise at the receiver, i.e., the conventional single-user decoder(SUD) is applied. This paper proposes a new decoding method for thedecentralized multiuser MIMO system, whereby each user opportunisticallycancels the co-channel interference from some or all of the other users viaapplying multiuser detection techniques, thus termed opportunistic multiuserdetection (OMD). This paper studies the optimal transmit covariance design forusers' iterative maximization of individual transmit rates with the proposedOMD, and demonstrates the resulting capacity gains in decentralized multiuserMIMO systems against the conventional SUD.

Exploiting Opportunistic Multiuser Detection in Decentralized Multiuser MIMO Systems