Joint design of physical and MAC layer by applying the constellation rearrangement technique in cooperative multi-hop networks

Abstract

Cooperative diversity schemes can be seen as an extension of spatial diversity systems, where distributed antennas are placed in relay nodes distributed in space as compared to a single multi-antenna source or receiver in conventional spatial diversity systems. Such cooperative communication systems improve the diversity gain significantly. In this paper a cross layer optimization scheme, based on cooperative diversity along with constellation rearrangement, is proposed for minimizing energy toll and enhancing the network longevity. By utilizing a cross-layer cooperative strategy, distributive algorithms are proposed for the dependability restriction multi-hop networks. We demonstrate through simulations that the proposed cross-layer cooperative strategies along with constellation rearrangement achieve considerable energy savings and extend the network longevity significantly. Finally the proposed scheme is evaluated through NS2 simulations in terms of throughput and delay.