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Contention-based geographic relay selection for cooperative networks has been proposed as a state-free distributed scheme to efficiently select the best relay within a geographic area. The a priori choices for the relaying area cause different effects on the overall network performance. In this paper, we focus on the fundamental problem of predefining the relaying area and investigate its impact on...
Most of geographic routing approaches in wireless ad hoc and sensor networks do not take into consideration the medium access control (MAC) and physical layers when designing a routing protocol. In this paper, we focus on a cross-layer framework design that exploits the synergies between network, MAC, and physical layers. In the proposed CoopGeo, we use a beaconless forwarding scheme where the next...
This paper presents an improved version of the opportunistic multipath (OM) proposed by Ribeiro et al. for cooperative communications. First, we generalize the OM scheme by using two groups of relays instead of using two relays for a source, so that inter-relay diversity can be achieved during the transmission between the two groups. Then, we propose a signal retransmission scheme for the relays based...
In this paper, we propose a novel and efficient relay selection protocol based on geographical information for cluster-based cooperative wireless sensor networks (WSNs). Multihop transmission is realized by concatenation of single cluster-to-cluster hops, where each cluster-to-cluster scheme forms the simplified cooperative network that consists of a single source- destination pair and a set of available...
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