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The coexistence of a single-input single-output (SISO) primary link and a multiple-input single-output (MISO) secondary link is considered in an extended cognitive radio channel setup, where the secondary transmitter has to obtain (“learn”) the primary message in a first phase rather than having non-causal knowledge of it. An achievable rate region is derived that combines decode-and-forward relaying...
This work considers the coexistence of a cognitive multiple-input multiple-output (MIMO)multiple access channel (MAC) system with a single-antenna legacy link which has a rate requirement. The legacy rate constraint is transformed into an interference constraint profile with individual interference temperature constraints (ITC) for the cognitive users. By spatial shaping (transmit covariance matrix...
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