This paper combines multi-hop networking with single-hop cooperative communications. The solution is built upon the standard IEEE 802.11 protocol operating in the ad hoc mode. A simulation based comparison is carried out in order to evaluate the performance gains and benefit of cooperative communications applied to multi-hop networking. Preliminary results indicate that network performance in t...

In recent times, for improving the performance of information transmission operating over the ever-challenging wireless medium, cooperative wireless communication has received tremendous interests as an untapped means. For multiple antenna systems, cooperative communication has emerged as a new dimension of diversity to emulate the strategies designed, due to dimension, expenditure, or hardware...

The IEEE 802.11 MAC protocol cannot support quality of service (QoS) requirements. In order to provide QoS in the IEEE 802.11 MAC protocol, the IEEE 802.11e has been standardized. These standards provide multiple transmission rates, which can be changed dynamically according to the channel condition. When using multiple transmission rates, the capacity of wireless LAN improves, but the performa...

3 Résumé long de la thése en français 5 Introduction 15 1 State of the Art and Mathematical Background 20 1.1 Cooperative Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 1.1.1 General Context . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 1.1.2 Cooperative Communications Protocols . . . . . . . . . . . . . . . . . . . . . . . ....

Cognitive Radio provides enhanced wireless communication performance through context-aware sensing and adaptation. Cooperative relay enhances network connection quality and improved system throughput. Applying cooperative relay communication technique on Cognitive Radio networks enables Cognitive Radio to opportunistically exploit cooperation between network nodes. This integrated design that b...

This paper considers a dual-hop cooperative satellite-unmanned aerial vehicle (UAV) communication system including satellite (S) and group of cluster headers (CHs) which are respectively with uniformly distributed UAVs. Specifically, the CHs serve as decode-and-forward relays to forward information transmitted by S Moreover, free-space optical (FSO) radio frequency (RF) technologies adopted ove...