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Consider a static wireless network that has two tiers with different priorities: a primary tier vs. a secondary tier. The primary tier consists of randomly distributed legacy nodes of density n, which have an absolute priority to access the spectrum. The secondary tier consists of randomly distributed cognitive nodes of density m = nbeta with beta ges 2, which can only access the spectrum opportunistically...
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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