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The distributed wireless communications system is a new architecture for wireless access with multiple distributed relay stations (RSs). Instead of the traditional cellular system, the multihop cellular network for executing their data transmission can potentially augment coverage, data rates, and quality of service (QoS) performance. However, in the multiuser environment the multihop cellular system...
Cooperative orthogonal frequency division multiplexing (OFDM) systems have been shown to be fertile in both spatial and frequency diversities and can provide high transmission throughputs. In this paper, we aim at developing a cooperative space-frequency block coded (SFBC) OFDM system by using Alamouti's coding scheme. With the selective decode-and-forward relaying strategy, we first derive the equivalent...
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...
Cooperative communication improves the QoE of source user by using relay user to retransmit its information to the destination. As a result, the improvement of QoE in source user is at the price of decaying the QoE in relay user. However, the QoE of relay user has been concerned little so far. In this paper, a new power control scheme to improve QoE of relay user in cooperative system has been proposed...
In this paper, we propose a novel relay selection scheme based on geographical information, aiming to minimize the symbol error probability (SEP) for wireless ad hoc relay networks. The proposed scheme utilizes only the source-relay and relay-destination distances as selection criteria to choose the best relay. In particular, such geographical information is often available during network initialization...
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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