Low Complexity Adaptive Antenna Selection for Cognitive Radio MIMO Broadcast Channels

A multi-antenna cognitive radio network, with a single pair of primary users and a secondary broadcast channel, is considered. Under perfect Channel State Information (CSI), the rate-optimal strategy for the primary link is waterfilling, resulting in possibly unused dimensions. The secondary base station, supplied with perfect and global CSI, employs block diagonalization for interference-free message precoding and opportunistic interference alignment to avoid disturbing primary communication. In the absence of sufficient resources to serve all secondary users, a low complexity adaptive antenna selection strategy is proposed. This scheme constructs, in each timeslot, the set of active antennas by opportunistically reusing information and resources from the preceding selection round.

Provided by: KTH - Royal Institute of Technology Topic: Mobility Date Added: Nov 2012 Format: PDF

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