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This paper presents a multi-antenna cognitive radio (CR) system that is capable of operating concurrently with the primary radio (PR) link. The operation of the CR system consists of three stages: environmental learning, CR channel training and CR data transmission. In environmental learning stage, partial channel information between PR and CR are obtained blindly, based on which the transmit beamforming...
This paper studies the information-theoretic limits of a cognitive radio (CR) network under spectrum sharing with an existing primary radio (PR) network for wireless communications. In particular, the fading cognitive multiple-access channel (C-MAC) is studied, where multiple CR users transmit to the base station (BS) of the CR network under both individual transmit power constraints and a set of...
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