In this letter, we investigate the outage performance of cooperative relaying transmissions in two-user non-orthogonal multiple access systems, wherein simultaneous wireless information and power transfer is employed at near users to their operations. To end, a best-near best-far (BNBF) user selection scheme proposed. Considering three protocols, i.e., decode-and-forward (DF), amplify-and-forward (AF), hybrid DF/AF tight closed-form approximate expressions for probability are derived...

In this paper, we study the statistical characterization and modeling of distributed multi-reconfigurable intelligent surface (RIS)-aided wireless systems. Specifically, consider a practical system model where RISs with different geometric sizes are distributively deployed, channels associated to assumed be independent but not identically (i.n.i.d.). We propose two purpose-oriented multi-RIS-aided schemes, namely, exhaustive RIS-aided (ERA) opportunistic (ORA) schemes. A mathematical...

In this paper, we study the performance improvement methods for a cell-edge user of two-user non-orthogonal multiple access (NOMA) systems in downlink scenarios. To end, propose two cooperative relaying schemes, namely ON/OFF-full-duplex (ON/OFF-FDR) and ON/OFF-half-duplex (ON/OFF-HDR) schemes. More specifically, order to improve user, consider cell-center as relay, where either FDR or HDR can be employed assist direct NOMA transmission from base station (BS) user. An ON/OFF mechanism is...

In this paper, we study the performance of a cell-edge user in two-user multiple-input single-output nonorthogonal multiple access (MISO-NOMA) system. Since outage and fairness data rate users are essential issues NOMA systems, focus on how to resolve such problems. To end, propose three cooperative downlink transmission schemes utilizing hybrid simultaneous wireless information power transfer (SWIPT) transmit antenna selection (TAS) protocols. Particularly, each scheme, cellcenter acts as...

We have fabricated and successfully tested an analog vector-by-matrix multiplier, based on redesigned 10×12 arrays of 55 nm commercial NOR flash memory cells. The modified enable high-precision individual tuning each cell, with sub-1% accuracy, while keeping the highly optimized cells, their long-term state retention, intact. array has area 0.33 μm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> per is at least one order magnitude more...

This paper studies the performance of multi-hop cognitive wireless powered device-to-device (D2D) communications in sensor networks (WSNs). In our analysis, each node harvests energy from multiple dedicated power beacons and shares spectrum resources with primary receivers (PRs) using underlay radio. Additionally, we consider a practical scenario D2D WSNs, where knowledge interference channels is assumed to be imperfect. To improve network performance, propose two user scheduling schemes,...

In this paper, we analyze the downlink outage performance of opportunistic scheduling in dual-hop cooperative networks consisting one source, multiple radio-frequency energy harvesting relays, and destinations. To end, two low-complexity, suboptimal, yet efficient, relay-destination selection schemes are proposed, namely direct links plus channel state information (CSI)-based (DOS) scheme partial CSI-based (DPS) scheme. Considering three relaying strategies, i.e., decode-and-forward (DF),...

Terahertz (THz) communication is envisioned as one of the candidate technologies for future wireless communications to enable achievable data rates up several terabits per second (Tbps). However, high pathloss and molecular absorption in THz band often limit transmission range. To overcome these limitations, this paper proposes intelligent reconfigurable surface (IRS)-aided networks with imperfect channel state information (CSI). Specifically, we present an angle-based trigonometric model...

This paper investigates the enhancement of physical layer security (PHY security) in Reconfigurable Intelligent Surfaces (RIS)-aided terrestrial and non-terrestrial networks (TN/NTN), focusing on challenges posed by node mobility. In context next-generation mobile networks, ensuring secure communication is critical, especially under varying channel conditions caused We explore different mobility models, including random walk, Gauss-Markov, reference point group mobility, to assess their...

We have modified a commercial NOR flash memory array to enable high-precision tuning of individual floating-gate cells for analog computing applications. The area per cell in 180 nm process is about 1.5 μm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . While this approximately twice the original size, it still at least an order magnitude smaller than state-of-the-art circuit implementations. new arrays been successfully tested,...

In this paper, we study relay selection in decode-and-forward wireless energy harvesting cooperative networks. contrast to conventional networks, the relays harvest from source’s radio-frequency radiation and then use that forward source information. Considering power splitting receiver architecture used at energy, are concerned with performance of two popular schemes, namely, partial (PRS) scheme optimal (ORS) scheme. particular, analyze system terms outage probability (OP) over independent...

In this article, we study the physical-layer security (PHY-security) improvement method for a downlink nonorthogonal multiple access (NOMA) system in presence of an active eavesdropper. To end, propose full-duplex (FD)-enabled NOMA and promising scheme, called minimal transmitter selection (MTS) to support secure transmission. Specifically, cell-center cell-edge users act simultaneously as both receivers jammers degrade eavesdropper channel condition. Additionally, proposed MTS scheme...

In this paper, we propose and investigate an aerial reconfigurable intelligent surface (aerial-RIS)-aided wireless communication system. Specifically, considering practical composite fading channels, characterize the air-to-ground (A2G) links by Namkagami-m small-scale inverse-Gamma large-scale shadowing. To delay-limited performance of proposed system, derive a tight approximate closed-form expression for end-to-end outage probability (OP). Next, mobile environment, where analysis is...

High-precision individual cell tuning was experimentally demonstrated, for the first time, in analog integrated circuits redesigned from a commercial NOR flash memory. The is fully automatic, and relies on write-verify algorithm, with optimal amplitude of each write pulse determined runtime measurements, using compact model cell's dynamics, fitted to experimental results. algorithm has allowed 100-cell array any desired state within 4-orders-of-magnitude dynamic range. With 10 pulses,...

In this paper we propose a soft-hard combination scheme, called SHC for cooperative spectrum sensing in cognitive radio networks. The scheme deploys cluster based network which Likelihood Ratio Test (LRT)-based soft is applied at each cluster, and weighted decision fusion rule-based hard utilized the center. novelties of are as follows: structure reduces complexity detection an inherent limitation schemes. By using LRT, can detect primary signals low signal-to-noise ratio regime (around...

In this paper, we consider a dual-hop decode-and-forward (DF) relaying network, where relays operate based on harvested energy from radio frequency (RF) radiation. Considering time switching-based mechanism, propose relay selection protocol, the having highest will forward received signal towards destination. We investigate system performance in terms of outage probability over Rayleigh fading channels. particular, derive analytical expression and closed-form its lower bound proposed...

This paper studies the performance analysis of wireless energy harvesting (EH) cluster-based multi-hop networks, where all communication nodes harvest from radiated signals transmitted by multiple power beacons (PBs) to support information transmission. To this end, we propose three relay selection schemes. The first scheme tries select largest forward information. second chooses relay, providing best data channel gain transmitter In third scheme, two relays in consecutive clusters will be...

In this paper, we investigate outage performance and diversity gain of transmit antenna selection (TAS) schemes in two-user multiple-input single-output non-orthogonal multiple access (MISO-NOMA) cooperative downlink transmissions. To end, two TAS criteria, namely Criterion I II, are proposed, which select an that experiences the best fading condition channel from source to far user near user, respectively. Additionally, considering as a relay help improve reliability hybrid simultaneous...

In this paper, we present a novel coexistence uplink-downlink stochastic mobile edge computing (MEC) system that considers the dynamic characteristics of both small cell base stations (SBSs) and user equipments (UEs). To devise an efficient radio resource management strategy encompassing association, channel allocation, power formulate optimization problem time, energy, achievable rate in utility function. The formulated is Mixed Integer Nonlinear Program (MINLP) has been proven to be...

In this paper, we investigate the sum-throughput of cell-center and cell-edge users in downlink scenarios cooperative simultaneous wireless information power transfer (SWIPT) non-orthogonal multiple access (NOMA) systems. Specifically, consider a two-user NOMA system, which user acts as power-splitting (PS)-based SWIPT relay aiming to improve performance user. order evaluate considered first derive closed-form expression for outage probability (OP) approximate OP Adopting gradient decent...

In this paper, we propose a federated learning (FL)-based jammer detection and waveform classification algorithm for distributed tactical wireless networks (TWNs). More specifically, consider TWN with multiple clusters various types of waveforms used in the presence mobile jammer. We analyze frequency domain received on local servers to extract unique cyclic from each waveform's spectral correlation function (SCF). The method is detect peak values frequency-cyclic plane. primary signal's SCF...