Comparison of Underlay and Overlay Spectrum Sharing Strategies in MISO Cognitive Channels

Provided by: ICST
Topic: Mobility
Format: PDF
The authors consider an extension of the cognitive radio channel model in which the secondary transmitter has to obtain ("Learn") the primary message in a first phase rather than having non-causal knowledge of it. They propose an achievable rate region that combines elements of decode-and-forward relaying with coding for the pure cognitive radio channel model. Moreover, they find the choice of parameters that maximize the secondary rate under a primary rate constraint. Finally, they compare numerically the performance of their system to that of an underlay scheme that combines beamforming, rate splitting, and successive decoding.

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