Design of DDF protocols for plug-and-play relays

Abstract : Relaying has been proposed as an efficient solution to increase transmission reliability by providing spatial diversity, and to increase transmission efficiency. Among the wide variety of existing relaying protocols proposed for the relay channel, we are interested in the Dynamic Decode and Forward (DDF) protocol as it outperforms all previously defined forwarding strategies in terms of Diversity Multiplexing Tradeoff. When using the DDF protocol, the relay assits the transmission only if it correctly decodes the sent message before the destination. We propose a practical implementation of this DDF protocol based on channel coding for hybrid automatic repeat request.Then, we define and study two relaying schemes for the relay channel that can be used when the source is relay-unaware: the Monostream scheme and the Distributed Alamouti scheme. The performance of these proposed relaying schemes for the DDF protocol are derived for open-loop and closed-loop transmissions. After defining the macro diversity order achieved by a transmission, we derived upper bounds on the achievable macro and micro diversity orders of these DDF protocols when the transmitting nodes use finite symbol alphabet. We proposed a so-called Patching technique in order to increase this achievable macro diversity order still guaranteeing that the source is relay-unaware. This Patching technique aims at increasing the number of bits transmitted by the relay up to the number of information bits in the message. This technique is also combined with Space Time Block Codes in order to improve both the achievable macro and micro diversity orders. This Patching technique has also been applied over the Interference Relay Channel where we introduce the use of a precoded DDF protocol at a relay shared by several source/destination pairs. We use the Patching technique in order to increase the achieved performance. The gain resulting from the use of these various derivations of the DDF protocol are finally observed at the system level for two scenarios: a macro cellular network over urban area and an indoor network, combined with two applications: a unicast transmission, e.g., web browsing, and a broadcasting transmission, e.g., video broadcasting. The results show that the Monostream relaying scheme for the DDF protocol provides good performance while allowing both the source and the destination to be relay-unaware. Consequently, the Monostream DDF is a promising protocol for the deployment of plug-and-play relays in wireless systems.
Keywords : Protocol relay
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Mélanie Plainchault. Design of DDF protocols for plug-and-play relays. Other. Télécom ParisTech, 2012. English. ⟨NNT : 2012ENST0023⟩. ⟨pastel-00958365⟩

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