Optimal Beamforming in MISO Cognitive Channels With Degraded Message Sets

Provided by: Institute of Electrical & Electronic Engineers
Topic: Mobility
Format: PDF
In this paper, the authors consider the coexistence of a Single-Input Single-Output (SISO) primary link with a Multiple-Input Single-Output (MISO) secondary user pair that has non-causal knowledge of the primary message. They study an achievable rate region that exploits this knowledge by combining selfless relaying to maintain the rate supported by the primary link with dirty paper coding to pre-cancel the interference at the secondary receiver. They find the optimal choice of power allocation between these operating modes at the secondary transmitter as well as the optimal beam-forming vectors.

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