In this paper, performance of a device-to-device (D2D) communication system is analyzed over double-generalized Gamma (dGG) fading channels. The dGG is a generic distribution for modeling double-scattering fading conditions. Co-channel interference (CCI) caused by various wireless devices in the system is also considered. The CCI fading channel is assumed to be Nakagami distributed. Analytical expressions for important statistical metrics, i.e. probability density function (PDF) and cumulative distribution function (CDF) of signal-to-interference ratio (SIR), are presented. Based on these statistical parameters, expressions for the outage probability, channel capacity and symbol error rate (SER) of the D2D communication system are presented. The performance of D2D system is then discussed and analyzed with the help of numerical results with arbitrary channel fading, path-loss and interference conditions.

In this paper, two cases of Device-to-Device (D2D) communication over a recently introduced extended η-μ fading channel are analyzed. Case A considers a direct D2D communication. While in case B, amplify-and-forward relay-assisted D2D communication is discussed. The effects of cochannel interference at the relay and D2D destination are also included. To combat fading, selection combining- and maximal ratio combining-based diversity schemes are also incorporated at the receiver. Power harvesting based on power splitting technique is also engulfed. Expressions of success and outage probabilities are derived with the help of characteristic function approach. Success and outage probability expressions are functions of path loss, distance between various devices and channel parameters. Based on these expressions, numerical results are presented and discussed.

Outage Analysis of Device-to-Device Communication System

This paper discusses amplify‐and‐forward relay‐assisted air‐to‐ground unmanned aerial vehicle communication over a recently proposed single‐shadowing‐based composite fading scenario. Included are the results derived from the Fluctuating Beckmann faded co‐channel interference at the receiver node and relay. Maximal ratio combining based diversity scheme is considered. The power splitting at the receiver for energy harvesting has been assimilated. The utilization of characteristic function leads to the derivation of outage, success probabilities, and capacity with outage expressions. These expressions represent the impact of path‐loss, aerial vehicle‐relay, relay‐receiver distances, and channel characteristics of desired and interference signals. Utilizing these expressions, numerical outcomes are presented and evaluated.

In this paper, a decode‐and‐forward relay‐assisted device‐to‐device (D2D) network is examined over novel multi‐cluster fluctuating two‐ray (MFTR) fading channels. All communication links are functioning in terahertz (THz) conditions. Co‐channel interference (CCI) is considered as well. We assume an eavesdropper is also present near the receiver and overhears the relay's signal. With the help of characteristic functions, expressions of outage, success probability, capacity with outage, secrecy outage, probability of strictly positive secrecy capacity and intercept probability are presented. These expressions are functions of MFTR fading conditions, THz channel parameters and distances between various nodes in the system. Numerical results based on the derived expressions are discussed under various scenarios.