Comparison of Underlay and Overlay Spectrum Sharing Strategies in MISO Cognitive Channels
| Autor: | Jing Lv, Ragnar Thobaben, Eduard A. Jorswieck, Ricardo Blasco-Serrano, Mikael Skoglund, Adrian Kliks |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Beamforming
Engineering Information-Theoretic Perspective Allocation 02 engineering and technology Overlay 0203 mechanical engineering 0202 electrical engineering electronic engineering information engineering Electronic engineering Underlay Computer Science::Information Theory Interference Channels Capacity business.industry ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS Transmitter Co-channel interference 020302 automobile design & engineering 020206 networking & telecommunications Radio Networks Telekommunikation Cognitive radio Telecommunications business Algorithm Decoding methods Coding (social sciences) |
| Zdroj: | CrownCom |
| Popis: | 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. QC 20121114 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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