Successful transmission probability of cognitive device-to-device communications underlaying cellular networks in the presence of hardware impairments

Abstract

This paper studies the cognitive wireless powered device-to-device (D2D) communication underlaying a cellular network, where there are two types of communications, including peer-to-peer (P2P) communication and a multi-hop D2D communication, which are assumed to be affected by hardware impairments (HWIs). We investigate the one-hop P2P communication and the multi-hop D2D communication, where the relay node helps other two user equipments (UEs) exchange information with a two-time-slot physical-layer network coding scheme. To examine the system performance, we derive closed-form expressions for the average energy efficiency (EE) and spectral efficiency (SE). Besides that, we also obtain the successful transmission probability (STP) for the two considered communications, and the optimal values of time switching (TS) and power splitting (PS) ratios are achieved with the help of a genetic algorithm (GA)-based optimization algorithm in our proposed energy harvesting (EH) protocol so-called Hybrid TS-PS (HTPS) relaying protocol. Comparisons between amplify-and-forward (AF) and decode-and-forward (DF) transmission schemes are provided. The simulation results give evidence that the STP is significantly improved regardless of the presence of HWIs thanks to the derived parameters, i.e., average EE, SE, and the optimal TS and PS ratios.

On the Transmission Probabilities in Quantum Key Distribution Systems Over FSO Links

“…is always less than zero for any θ V . From the second equal sign in (37), for Θ E < −α 2 4 , the TPRE becomes TPRE = Pr…”

“…However, the authors in [36] still did not investigate the transmission probabilities depending on a variety practical conditions, which is also important for the FSO QKD system evaluation. Similar to [37]- [39], the transmission probability in this paper is defined as the probability that the received power is satisfied one or more pre-set thresholds in the FSO QKD system, which is obviously a natural variant of the outage probability in traditional communications [35].…”

Pairwise Error Probability Analysis of Low Density Parity Check Coded Asynchronous Distributed Space Time Block Codes

“…In many wireless scenarios there is a limitation on power, size, and hardware complexity and propagation environment which limit the deployment of multiple antennas as in MIMO. Cooperative communication [3][4][5] is a technique to overcome these drawbacks and form a virtual MIMO antenna array by utilizing relays which assist the direct communication with high diversity gain. Linear dispersion (LD) codes [6] act as an umbrella codes yielding both diversity and capacity gains for synchronous as well as the asynchronous environments.…”

Outage and Bit Error Probability Analysis in Energy Harvesting Wireless Cooperative Networks

“…As for systems with relays, power splitting-based relaying (PSR) and time switching-based relaying (TSR) are the two most frequently used protocols for signal processing and EH at a specific relay node [9]. Moreover, a special TS-PS protocol, namely hybrid TS-PS relaying (HTPS) protocol, is studied in [10].…”