Comparison of Underlay and Overlay Spectrum Sharing Strategies in MISO Cognitive Channels
2012 (English)In: 2012 7th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM), IEEE Computer Society, 2012, 224-229 p.Conference paper (Refereed)
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 with coding for the pure cognitive radio channel model. Moreover, we find the choice of parameters that maximize the secondary rate under a primary rate constraint. Finally, we compare numerically the performance of our system to that of an underlay scheme that combines beamforming, rate splitting, and successive decoding. We observe that although the overlay design provides higher rates, the losses due to the first phase are quite severe. In fact, for the considered scenarios, cleverly designed underlay schemes can provide comparable performance.
Place, publisher, year, edition, pages
IEEE Computer Society, 2012. 224-229 p.
Information-Theoretic Perspective, Interference Channels, Radio Networks, Capacity, Allocation
IdentifiersURN: urn:nbn:se:kth:diva-104532DOI: 10.4108/icst.crowncom.2012.248283ISI: 000310377900040ScopusID: 2-s2.0-84869397177ISBN: 978-1-936968-55-8OAI: oai:DiVA.org:kth-104532DiVA: diva2:564992
7th International Conference on Cognitive Radio Oriented Wireless Networks (CROWNCOM),18-20 June 2012, Stockholm, Sweden
FunderEU, FP7, Seventh Framework Programme, 257626ICT - The Next Generation
QC 201211142012-11-142012-11-052013-04-15Bibliographically approved