Initial efforts on wireless power transfer (WPT) have concentrated toward long-distance transmission and high applications. Nonetheless, the lower achievable efficiency potential health concerns arising due to applications, caused limitations in their further developments. Due tremendous energy consumption growth with ever-increasing connected devices, alternative information techniques been important not only for theoretical research but also operational costs saving sustainable of...

Covert communications hide the transmission of a message from watchful adversary while ensuring certain decoding performance at receiver. In this paper, wireless communication system under fading channels is considered where covertness achieved by using full-duplex More precisely, receiver covert information generates artificial noise with varying power causing uncertainty adversary, Willie, regarding statistics received signals. Given that Willie's optimal detector threshold test on power,...

A large-scale fully digital receive antenna array can provide very high-resolution direction of arrival (DOA) estimation, but resulting in a significantly high RF-chain circuit cost. Thus, hybrid analog and (HAD) structure is preferred. Two phase alignment (PA) methods, HAD PA (HADPA) (HDAPA), are proposed to estimate DOA based on the parametric method. Compared (APA), they reduce complexity phases. Subsequently, fast root multiple signal classification HDAPA (root-MUSIC-HDAPA) method...

In this paper, a practical wireless transmission scheme is proposed to transmit confidential messages the desired user securely and precisely by joint use of multiple techniques, including artificial noise (AN) projection, phase alignment/beamforming, random subcarrier selection (RSCS) based on orthogonal frequency division multiplexing (OFDM), directional modulation (DM), namely RSCS-OFDM-DM. This RSCS-OFDM-DM provides an extremely low-complexity structure for receiver makes secure precise...

Radio frequency based device-free passive localization has been proposed as an alternative to indoor because it does not require subjects wear a radio device. This technique observes how people disturb the pattern of waves in space and derives their positions accordingly. The well-known multipath effect makes this problem very challenging, complex environment is impractical have enough knowledge be able accurately model effects subject on surrounding links. In addition, even minor changes...

Small-cell caching utilizes the embedded storage of small-cell base stations (SBSs) to store popular contents for sake reducing duplicated content transmissions in networks and offloading data traffic from macrocell SBSs. In this paper, we study a probabilistic strategy, where each SBS caches subset with specific probability. We consider two kinds network architectures: 1) The SBSs are always active, which is referred as always-on architecture; 2) activated on demand by mobile users (MUs),...

This paper investigates the joint transmitter and receiver optimization for energy efficiency (EE) in orthogonal frequency-division multiple-access (OFDMA) systems. We first establish a holistic power dissipation model OFDMA systems, including transmission power, signal processing circuit from both sides, while existing works only consider one side consumption also fail to capture impact of subcarriers users on system EE. The EE maximization problem is formulated as combinatorial fractional...

In this paper, we consider wireless powered communication networks (WPCNs) where multiple users harvest energy from a dedicated power station and then communicate with an information receiving in time-division manner. Thereby, our goal is to maximize the weighted sum of user efficiencies (WSUEEs). contrast existing system-centric approaches, choice weights provides flexibility for balancing individual EEs via joint time allocation control. We first investigate WSUEE maximization problem...

Modern fog network architectures, empowered by IoT applications and 5G communications technologies, are characterized the presence of a huge number mobile nodes, which undergo frequent handovers, introducing significant load on involved entities. Considering distributed flat nature these DMM can be only viable option for efficiently managing handovers in scenarios. The existing solutions capable providing smooth but lack robustness from security point view. Indeed, depends external...

In this work, we propose a covert communication scheme where the transmitter attempts to hide its transmission full-duplex receiver, from warden that is detect using radiometer.Specifically, first derive detection error rate at warden, based on which optimal threshold for radiometer analytically determined and expected over wireless fading channels achieved in closed-form expression.Our analysis indicates artificial noise deliberately produced by receiver with random transmit power, although...

Federated learning is a privacy-preserving approach to train global model at central server by collaborating with wireless devices, each its own local training data set. In this paper, we present compressive sensing for federated over massive multiple-input multiple-output communication systems in which the equipped antenna array communicates devices. One major challenge system design reconstruct gradient vectors accurately server, are computed-and-sent from To overcome challenge, first...

In this paper, we make an investigation of robust beamforming for secure directional modulation in the multiuser multiple-input and multiple-output systems presence direction angle measurement errors. When statistical knowledge errors is unavailable, a novel scheme combining main-lobe-integration leakage proposed to simultaneously transmit multiple different independent parallel confidential message streams associated distinct desired users. The includes two steps: designing vectors useful...

The fifth generation and beyond wireless communication will support vastly heterogeneous services user demands such as massive connection, low latency high transmission rate. Network slicing has been envisaged an efficient technology to meet these diverse demands. In this paper, we propose a dynamic virtual resources allocation scheme based on the radio access network (RAN) for uplink communications ensure quality-of-service (QoS). To maximum weighted-sum rate performance under delay...

Due to robustness against multipath effect, frequency domain CSI (Channel State Information) of OFDM (Orthogonal Frequency Division Multiplexing) systems is supposed provide good ranging measurement for indoor localization. Since lower bound positioning error CSI-based localization has been rarely reported, this paper proposes a Cramer-Rao (CRLB) This CRLB derived based on wireless propagation model integrating both shadowing effect and effect. The main factors that can influence the are...

In this paper, the problem of content caching in 5G cellular networks relying on social-aware device-to-device communications (DTD) is investigated. Our focus how to efficiently select important users (IUs) and allocate files storage these selected IUs form a distributed system. We aim at proposing novel approach for minimizing downloading latency maximizing social welfare simultaneously. particular, we first model as many-to-one matching game based property mobile users. study by exploiting...

The hybrid wireless and power line communication (HWPLC) networks address the problem that mobile sensors (PLC) cannot communicate with each other within an Internet of Things (IoT) network. In this paper, we design a relay equipped dual PLC interface, which connects both into IoT Furthermore, dual-interface forwards messages by adaptively selecting interface according to channel state. A general mathematical probability model relaying system is presented. density function output...

Evidence indicates that demands from mobile users (MU) on popular cloud content, e.g., video clips, account for a dramatic increase in data traffic over cellular networks. The repetitive downloading of hot content servers will inevitably bring vast quantity redundant transmissions to A strategy distributively pre-storing the memories small-cell base stations (SBS), namely, caching, is an efficient technology reducing communication latency whilst mitigating streaming substantially. In this...

Recent years have seen rapid deployment of mobile computing and Internet Things (IoT) networks, which can be mostly attributed to the increasing communication sensing capabilities wireless systems. Big data analysis, pervasive computing, eventually artificial intelligence (AI) are envisaged deployed on top IoT create a new world featured by data-driven AI. In this context, novel paradigm merging AI communications, called Wireless that pushes frontiers network edge, is widely regarded as key...

Recently, acoustic-based indoor localization has attracted much attention due to its affordable infrastructure costs and high accuracy. However, previous work is infeasible in mobile target tracking for long latency obtaining sufficient beacon messages. In addition, the performance can further deteriorate device diversity, varying channel gains, background noises. To this end, we propose an asynchronous acoustic system (AALTS), which utilizes distributed anchor nodes locate passive...

With the emergence of concepts such as Metaverse and Web 3.0, digital identity plays a very important role one its infrastructures. The traditional model is no longer suitable for requirements economy to some extent at this stage. centralized management system has many drawbacks. For example, owner does not actually control his own identity, there risk easy disclosure theft information. Blockchain technology characteristics decentralization, tamper-proof, traceability, etc., which can...

In heterogeneous networks (HetNets), the load between macrocell base stations (MBSs) and small-cell (SBSs) is imbalanced due to their different transmission powers locations. This imbalance significantly impacts system performance affects experience of mobile users (MUs) with priorities. this paper, we aim distributively optimize user association in HetNets various priorities solve balancing problem. Since a binary matching problem, which NP-hard, propose distributed belief propagation (BP)...

Wireless sensor networks (WSNs) have been widely used in a plenty of applications. To achieve higher efficiency for data collection, WSNs are often partitioned into several disjointed clusters, each with representative cluster head charge the gathering and routing process. Such partition is balanced effective, if distance between node its can be bounded within constant number hops, any two heads connected. Finding such minimum clusters connectors defined as connected d-hop dominating set...

A compact circularly polarized rectenna with harmonic suppression for wireless power transmission at 5.8 GHz is proposed in this letter. The substrate integrated waveguide structure adopted enhanced gain, unidirectional patterns, and surface wave suppression. rectifier, which consists of a matching network, diode, dc-pass filter, the antenna back side. fabricated measured. It features 6.9 dB 0.67 axial ratio, 30 return loss. conversion efficiency 65.87% 700 Ω load. array also built an...

Optimal power allocation (PA) strategies can make a significant rate improvement in secure spatial modulation (SM). Due to the lack of secrecy (SR) closed-form expression SM networks, it is hard optimize PA factor. In this paper, two are proposed: gradient descent (GD), and maximum product signal-to-interference-plus-noise ratio (SINR) artificial-noise-to-signal-plus-noise (ANSNR) (Max-P-SINR-ANSNR). The former an iterative method latter solution. Compared former, low-complexity. Simulation...