In this paper, we study a hybrid satellite-terrestrial spectrum sharing system (HSTSSS) in which multiple terrestrial secondary networks cooperate with primary satellite network for dynamic access. For complexity-aware HSTSSS design, propose an amplify-and-forward-based overlay protocol using partial and opportunistic selection schemes. The aims to minimize the outage probability of and, thereby, explore opportunities. With approach, selected allocates part its power relay signal utilizes...

We consider a hybrid satellite-terrestrial relay system that employs multiantenna satellite to communicate with multiple users via amplify-and-forward relays. employ max-max user-relay selection scheme minimize the outage probability of system. Considering both variable and fixed gain relaying protocols, we derive exact closed-form expressions their asymptotic behavior over independent identically distributed fading channels for each hop. Numerical simulation results validate our analysis...

In this paper, we study the physical layer security of a downlink hybrid satellite-terrestrial relay network (HSTRN), where multi-antenna satellite communicates with multiple terrestrial destinations via cooperative relays in presence eavesdroppers. We investigate secrecy performance considered HSTRN by employing two classic protocols, namely, amplify-and-forward and decode-and-forward for intercepting scenarios at eavesdroppers, i.e., non-colluding colluding For both these present...

Non-orthogonal multiple access (NOMA) has been recognized as a key driving technology for the fifth generation (5G) and beyond 5G cellular networks. For practical downlink NOMA system with imperfect successive interference cancellation (SIC), we derive bounds on power allocation factors formulate minimum signal-to-interference-plus-noise ratio (SINR) difference criterion pair formation. Through extensive simulations, show effect of SIC rate performance trade-off its OMA (orthogonal access)...

In this letter, we investigate the performance of an overlay cognitive satellite-terrestrial network comprising a primary satellite source with its multiple terrestrial receivers and secondary transmitter-receiver pair on ground. Herein, employs non-orthogonal access (NOMA) scheme to simultaneously serve all users, while transmitter assists communication through cooperative relaying technique in exchange for spectrum access. For overall set-up, obtain closed-form expressions outage...

Satellite communication systems need to be integrated with emerging cooperative relaying techniques provide seamless connectivity and high-speed broadband access for mobile users in future wireless networks. In this paper, we study a multi-antenna multiuser hybrid satellite-terrestrial relay network (HSTRN) employing opportunistic user scheduling outdated channel state information (CSI) amplify-and-forward co-channel interference (CCI). By adopting Shadowed-Rician fading satellite links...

In this paper, we evaluate the performance of an outage-optimal two-way opportunistic relaying (TWOR) scheme with analog network coding (ANC) over independent but not necessarily identically distributed (i.ni.d.) Nakagami- <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</i> fading channels. Considering arbitrary integer-valued parameters two hops, derive exact outage expression that is applicable for entire range signal-to-noise ratio (SNR). For...

In this letter, we analyze the performance of cognitive amplify-and-forward multirelay networks with active direct link in presence relay transceiver hardware impairments. Considering distortion noises on both interference and main data links, derive tight closed-form outage probability expressions their asymptotic behavior for partial selection (PRS) opportunistic (ORS) schemes over Rayleigh fading channels. Both PRS ORS are found to attain full diversity low target rates only, otherwise a...

Important statistical properties of the double-generalized Gamma (dGG) distribution are studied in this paper. The dGG is suitable for modeling non-homogeneous double-scattering radio propagation fading conditions, which can be frequently observed vehicle-to-vehicle (V2V) communications. In context, important metrics bivariate distribution, such as joint probability density function, cumulative and moments, derived first time, while simplified expressions corresponding marginal presented....

In this paper, we investigate the ergodic capacity (EC) of a downlink multiuser hybrid satellite-terrestrial amplify-and-forward relay network (HSTAFRN) using fixed-gain relaying protocol in presence co-channel interference. Herein, employ opportunistic scheduling terrestrial users by considering outdated channel state information over Nakagami- <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</i> fading channels pertinent links. By...

In this paper, we investigate the performance of energy harvesting two-way relay systems in presence transceiver hardware impairments (HIs). order to improve reliability communication links, employ a three-phase hybrid decode-amplify-forward (HDAF) based relaying scheme. considered system, battery-enabled node harvests from ambient radio-frequency (RF) signals using time switching approach. We demonstrate that HIs pose detrimental impact on system by invoking ceiling effects, primarily when...

Energy harvesting with cognitive radio and nonorthogonal multiple access (NOMA) techniques offer a promising solution to enhance the spectral energy efficiency in Internet of Things (IoT) networks. This article investigates performance an overlay NOMA (OCNOMA) system tailored for IoT applications. Herein, primary network includes transmitter-receiver pair, whereas secondary comprises energy-constrained full-duplex (FD) relaying-based transmitter (ST) its intended receivers. Accordingly, ST...

This paper investigates the performance of an underlay cognitive hybrid satellite-terrestrial network comprising a primary satellite source with its multiple terrestrial receivers and secondary transmitter pre-paired users that are deployed on ground based cooperative non-orthogonal access (C-NOMA) scheme. Herein, nearby NOMA user works in full-duplex (FD) mode while employing decode-and-forward relaying strategy for improving far-away user. Importantly, we consider realistic assumptions...

In this letter, we evaluate the outage performance of analog network coding (ANC) protocol for a two-way half-duplex relaying system with asymmetric traffic requirements at end terminals. We derive simple and generalized expression overall probability in Rayleigh flat-fading environment. also deduce optimal relay location power allocation order to minimize outage. Numerical simulation results highlight effect positioning under various requirements.

In this paper, we investigate the performance of an analog network coding (ANC)-based two-way relay system that employs beamforming at multi-antenna sources. Specifically, analyze overall by deriving exact expression for symbol error rate (OSER) and upper bound ergodic sum-rate (ESR) over independent non-identically distributed Nakagami- m fading channels. We also derive closed-form representations these expressions in asymptotic high signal-to-noise ratio (SNR) regime to provide useful...

In this paper, we propose and investigate an estimate-and-forward (EF) relaying scheme with half-duplex transmission protocol in a two-hop diffusion-based molecular communication (DMC) system under the influence of both residual counting noises. The proposed forwards estimate transmitted number molecules, which is derived using maximum likelihood principle. Based on estimate, assess performance EF terms throughput end-to-end error probability. Further, calculate energy consumption...

In this article, we investigate the performance of a piece-wise linear model energy harvesting-based multiuser overlay spectrum sharing system. Herein, an energy-constrained secondary node acts as cooperative relay to assist information transmission between primary transmitter and multiple receivers. return for cooperation, enjoys access user's its own transfer. Specifically, by employing time-switching based receiver, harvests from received radio-frequency signal during dedicated harvesting...

The application of Non-Orthogonal Multiple Access (NOMA) technology into satellite-aerial-ground integrated networks can meet the requirements ultra-high rate and massive connectivity for Sixth-Generation (6G) communication systems. We consider an uplink NOMA scenario such a network where multiple users communicate with satellite under help Unmanned Aerial Vehicle (UAV) as aerial relay equipped phased array. Supposing that buffer-aided decode-and-forward protocol is adopted at UAV relay, we...

In this paper, we analyze the performance of an energy harvesting (EH)-assisted overlay cognitive non-orthogonal multiple access (NOMA) system. The underlying system consists a primary transmitter-receiver pair accompanied by energy-constrained secondary transmitter (ST) with its intended receiver. Accordingly, ST employs time switching (TS) based receiver architecture to harvest from radio-frequency signals transmissions, and thereby uses relay information transmit own simultaneously using...

Energy and spectral efficiency of Internet Things (IoT) networks can be improved by integrating energy harvesting (EH), cognitive radio, nonorthogonal multiple access (NOMA) techniques, while unmanned aerial vehicles (UAVs), on the other hand, are a quick adaptable entity for improving coverage performance. In this article, we assess performance UAV-assisted overlay NOMA (OC-NOMA) system employing an EH-based IoT-inspired cooperative spectrum sharing transmission (I-CSST) scheme. Herein,...

In this paper, we examine the performance of simultaneous wireless information and power transfer (SWIPT) in two-way relay networks under Nakagami-m fading. We consider a three-node communications system, where two source nodes communicate to each other via half-duplex battery-enabled node. A hybrid decode-amplify-forward (HDAF) based relaying scheme is proposed make communication links more reliable. With scheme, node can harvest energy from radio-frequency (RF) signals, destination exploit...