This paper considers wireless communication protocols implementing both cooperation and Hybrid Automatic Repeat reQuest (HARQ). Based on a simple example (one Source, one Relay and one Destination), we propose the use of probabilistic protocols as an alternative to classical, deterministic ones. Starting initially with the Finite State Markov Chain (FSMC) analysis of a deterministic protocol, the idea of probabilistic protocol comes as an association with the simplified FSMC of the deterministic protocol. This FSMC contains two parameters that can be optimized for finding the best performance. So far, probabilistic protocols have been proposed at higher layers of communication systems, while we consider here the physical and MAC layers. In our analysis, the Relay works in Demodulate-and-Forward (DMF) mode, and we demonstrate that (i) the FSMC analysis predicts accurately the performance of the actual system, and (ii) the performance of probabilistic protocol (when the two parameters are carefully tuned) outperforms the performance of a reference deterministic protocol. Analysis is checked upon Monte Carlo simulations.
Relaying protocols are usually deterministic, i.e. they commute from one action to the next one in a predefined manner, depending on the success of the transmission. This paper demonstrates the advantages that probabilistic protocols (i.e. the next action to be undertaken depends on some probability) may have in this context. The whole study is performed on a simple sourcerelay-destination network, the relay working in demodulate and forward mode, in order to obtain insights on the interaction between relaying and HARQ. So far, probabilistic protocols have been mainly proposed for higher layers of communication systems, but are applied here to physical and MAC layers. Since it contains only two parameters, we demonstrate that our probabilistic protocol can easily be tuned for best performance using a Finite State Markov Chain (FSMC), and that it brings improvement over deterministic protocols in the same scenario.
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