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- W2269136472 abstract "Automatic Repeat Request protocols (ARQ) are widely implemented in current mobile wireless standards such as HSDPA and LTE. In general, ARQ protocols are combined with channel coding to overcome errors caused by the lack of channel knowledge at the transmitter side. These protocols are called Hybrid ARQ protocols (HARQ). HARQ protocols ensure a good reliability (at least a small packet error rate) of the physical layer for the OSI upper layers. The purpose of this thesis is to provide tools for the analysis and the optimization of HARQ communication systems with an emphasis on cognitive systems. Cognitive Radio (CR) is an approach aiming to increase the spectral efficiency of wireless networks. In a CR context, unlicensed users are allowed to communicate within the same frequency bands and at the same time as licensed users. Secondary users must however limit the amount of interference generated on the primary users signals. In this thesis, we consider a scenario in which the secondary user interferes a primary user employing a HARQ protocol. When the secondary user knows the state of the primary HARQ protocol, we show that a joint power and rate allocation can be performed to limit the interference." @default.
- W2269136472 created "2016-06-24" @default.
- W2269136472 creator A5076453660 @default.
- W2269136472 date "2013-12-05" @default.
- W2269136472 modified "2023-09-28" @default.
- W2269136472 title "Hybrid-ARQ mechanisms in a radio-cognitive context." @default.
- W2269136472 hasPublicationYear "2013" @default.
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