Comparison of Underlay and Overlay Spectrum Sharing Strategies in MISO Cognitive Channels
Ricardo Blasco-Serrano, Jing Lv, Ragnar Thobaben, Eduard Axel Jorswieck, Adrian Kliks, Mikael Skoglund · 2012
We 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. We propose an achievable rate region that combines elements of decode--and--forward relaying w