Linear precoding in MISO cognitive channels with causal primary message
| Autor: | Ragnar Thobaben, Ricardo Blasco-Serrano, Jing Lv, Eduard A. Jorswieck |
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| Rok vydání: | 2012 |
| Předmět: |
Computer science
Cognitive radio 0207 environmental engineering Data_CODINGANDINFORMATIONTHEORY 02 engineering and technology Topology Radio transmitters Receivers Precoding 0202 electrical engineering electronic engineering information engineering Underlay 020701 environmental engineering Channel code Signal to noise ratio Cognitive radio channel business.industry Complexity theory Transmitter 020206 networking & telecommunications Cognition Telekommunikation Telecommunications Interference business Coding (social sciences) |
| Zdroj: | ISWCS |
| DOI: | 10.1109/iswcs.2012.6328399 |
| Popis: | The coexistence of a single-input single-output (SISO) primary link and a multiple-input single-output (MISO) secondary link is considered in an extended cognitive radio channel setup, where the secondary transmitter has to obtain (“learn”) the primary message in a first phase rather than having non-causal knowledge of it. An achievable rate region is derived that combines decode-and-forward relaying with linear precoding in the second phase. The optimal transmission strategy is found that maximizes the secondary rate with the primary rate requirement. The performance of the proposed strategy is compared with that in [1], where dirty-paper coding (DPC) is deployed in the second phase, in terms of average secondary rate. The performance degradation is negligible at certain SNR and primary link load, and the implementation is of lower complexity. The comparison with the underlay strategy in [2] is also performed, where the secondary transmitter has no knowledge of the primary message. QC 20121114 |
| Databáze: | OpenAIRE |
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