An Adaptive Transmission Scheme for Amplify-and-Forward Relaying Networks

Abstract-In this work, an adaptive scheme for amplify-andforward relaying networks is proposed, which selects a certain transmission mode for each communication process. Depending on the instantaneous channel conditions, one of the following modes is selected: direct transmission with no cooperation, cooperative transmission with half-duplex relaying and maximalratio combining at the destination, or cooperative transmission with full-duplex relaying and maximal-ratio combining at the destination. A three-node network is considered, containing a singleantenna source, a two-antenna relay that is able to implement full-duplex communication, and a single-antenna destination. Energy normalization per block is assumed, so that in those modes using cooperation the system's transmission power is shared between source and relay. The performance analysis is provided in terms of outage probability and energy efficiency. We derive a tight approximate expression in closed form for the outage probability and an approximate expression in integral form for the mean energy consumption. The results show that our scheme outperforms all of transmission modes separately in terms of outage probability, while being more energy efficient than the cooperative transmission modes. Additionally, the asymptotic analysis proves that the proposed scheme achieves full diversity order equal to 2, thus outperforming those schemes with direct transmission or full-duplex cooperation only. Index Terms-Amplify-and-forward, direct link, half duplex, full duplex, adaptive transmission mode, outage probability, relaying networks, energy efficiency

Outage, throughput and energy efficiency analysis of some half and full duplex cooperative relaying schemes

In this paper, we compare cooperative full‐duplex (FD) and incremental cooperative half‐duplex (HD) relaying, in terms of outage probability, throughput and energy efficiency. We consider a practical model for the FD relay, where self‐interference between transmitted and received signals is taken into account. The FD transmission is based on the well‐known block Markov encoding scheme. For the HD transmission, incremental space–time cooperation and selection combining based on the cooperative decode‐and‐forward protocol are considered. Our results show that incremental cooperative HD relaying can outperform cooperative FD relaying, specially if the self‐interference is non‐negligible, achieving a better trade‐off between throughput and energy consumption251111141125CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESnão temnão te