Since the outbreak of COVID-19 pandemic in 2020, a dramatic loss human life has occurred and this trend presents an unprecedented challenge to public health, economic systems social operations. Hence, it is urgent for us take some countermeasures restrain dispel epidemic diffusion uttermost. Data freshness plays inevitable role timely infestor determination during process. However, existing works pay little attention optimizing indicator health monitoring. To make up research gap, paper, we...

Wireless sensing systems have been employed in the field of healthcare, environment monitoring, and smart agriculture, etc. Since freshness accuracy indicators data are critical to wireless systems, it is great significance ensure their performances simultaneously, i.e., Age Information (AoI) information entropy should be jointly optimized. In this regard, we first establish system models, including AoI expressions. Next, from viewpoint, theoretically analyze an impact on accuracy. Then,...

Abstract Here, a multi‐user signal iterative detection and decoding scheme named LBEP based on block expectation propagation (BEP) is proposed for LDPC‐coded two‐phase unsourced random access (URA) scheme. In the process, approximation of matrix inversion used to facilitate (EP). addition, this idea also applied double EP (DEP) The simulation results show that, in URA scheme, performance similar BEP LDPC codes, but complexity receiver greatly reduced.

In the paper, performance of multiple-input-multiple-output (MIMO) systems using a zero forcing detector is studied over Rayleigh and Rice fading channels. Approximation to distribution non-central complex Wishart used derive post-detection signal-to-noise (SNR) ratio. A closed-form expression bit error rate obtained in terms hypergeometric Gamma functions. The MIMO under scenario that individual sub-channels are correlated also investigated. It shown that, for exponential correlation...

In spectrum pooling scenario, the spectral leakage of DFT-based OFDM signal can be divided into in-band-out-ofsubband (IBOSB) radiation and out-of-band (OOB) radiation. A precoding scheme is proposed to suppress IBOSB sidelobes. The design based on generalized eigenvalue problem. Simulation results demonstrate that sidelobes significantly in contrast uncoded schemes. At same time, Bit-Error-Rate (BER) performance precoded system over multipath fading channel improved due frequency diversity.

A joint radar‐communication (JRC) system with both radar sensing and communication abilities is proposed to improve spectrum utilisation efficiency. The transmitter of the JRC consists multiple antenna subarrays transmitting orthogonal waveforms. If receivers are in sidelobe directions, data symbols embedded magnitude ratio as well phase shift between transmit waveform pairs. In case main lobe direction, pairs only preserve optimum target detection performance. Novel symbol mapping...

Integrated radar-communication system based on multiple input and output (MIMO) shares the hardware resource spectrum to fulfill radar communication functions, simultaneously. The baseband signal models of MIMO integrated are set up. Then, mutual information channel capacity derived accordingly. Radar is used evaluate performance; one methods measure capability. influences signal-to-noise ratio number antennas, presented through simulations.

As one of the most important representatives for edge intelligence, Unmanned Aerial Vehicle (UAV) can be used to provide intelligent service, such as performing data collection, computation and transmission tasks in air-to-ground networks. In considered Sensed Data Collection Networks (SDCNs), UAV is charge collecting computing sensed from mobile ground nodes, multiple performance metrics need jointly optimized, including collected data's Age Information (AoI) Signal Interference plus Noise...

As a promising enabler for edge intelligence, Unmanned Aerial Vehicles (UAVs) are playing more and important role in Mobile Edge Computing Networks (MECN), such as ground sensor communication assistance, user data collection, computation offloading remote control services. In UAV-aided MECN, the timeliness of exchange is key factor that influences real-time data-driven decisions at server-side. Simultaneously, Age information (AoI) also an indicator reflects freshness terms destination...

As a promising enabler for sensing data collection manner, Mobile Crowdsensing (MCS) can play an important role due to its low implementation cost, flexible manner and controllable quality traits. To investigate the freshness metric as well ensure security, with help of stochastic geometry tool, this paper designs Non-Orthgonal Multiple Access (NOMA)-based Age Information (AoI) performance analysis privacy preservation-oriented MCS. be specific, privacy-preserving MCS system model is...

Mobile crowdsensing (MCS)-enabled data collection can be implemented in a cost-effective, scalable, and flexible manner. However, joint sensing freshness security assurance have not been fully investigated the current research. To address these two concerns, potential game homomorphic encryption-based Age of Information (AoI) optimization privacy-preservation scheme for MCS is put forward this paper. At first, AoI minimization privacy preservation-oriented system framework established. Then,...

Recently, due to the benefits of system extensibility, deployment cost, and implementation flexibility, mobile crowdsensing (MCS) is a popular method for sensing data collection. This paper aims at developing timely secure model MCS by realizing joint Age Information (AoI) performance optimization privacy preservation. First, based on queuing theory, AoI expression derived in closed form. Next, through mean field game (MFG)-based rate control policy, optimized. Meanwhile, adopting broadcast...

Efficient grant-free uplink transmission is critical in minimizing Age of Information (AoI) multichannel Internet Things (IoT) networks. But less attention has been paid to this topic especially when dynamic channel access attacks (DCAAs) exist. To bridge gap, article formulates the distributed problem AoI-oriented IoT networks, and then a reinforcement learning-based solution put forward based on theoretical results game theory. First, utility maximization formulated for each sensor node...

Millimeter wave (mmWave) unmanned aerial vehicle (UAV)-aided networks have enormous application potential due to their large bandwidth and ultra-high speed, being regarded as an effective technology for improving the reliability of military civilian fields. However, complex electromagnetic spectrum environment sensitivity mmWaves blocking effects, its performance analysis faces certain difficulties. This article investigates coverage network capacity mmWave UAV-aided under significant...

Using the frequency‐division duplex long‐term evolution (LTE)‐based multistatic passive radar system for unmanned aerial vehicle (UAV) detection is considered. The typical outdoor terrestrial LTE eNodeBs and broadband direct air‐to‐ground communications network are used to cover UAVs at low altitude medium‐high altitude, respectively. bistatic range measurements obtained from multiple eNodeBs, hyperbolic positioning technique target localisation. Since existing downlink signals more suitable...

As a promising communication paradigm in the 5G era, IEEE 802.11ad 60GHz mmWave has many desirable properties, including high bandwidth, narrow beam, transmission quality, and low mutual-interference. However, recently revealed Man-in-the-middle (MITM) attack can endanger security privacy of systems. Existing MITM detection solutions, established on ideal assumptions, neglect fact that attacker change its transmitting power make it hard to be detected. In this backdrop, cross-layer location...

In this paper, to provide the theoretical reference for semantic sensing performance, stochastic geometry tool is used make quantitative coverage performance analysis of keywords. This method can help understand network from macroscopic view rather than connection-oriented perspective. Firstly, through mapping operation, context space transformed into in process. Secondly, given text data with different statement styles, e.g., literary and scientific texts, two typical reflection models are...

Networking Radar-Communication Integrated System (RCIS) promises an improved performance of radar and communication system platform by expanding scanning range sharing information with each other. But equipping RCIS directional antennas, in return, will worsen network's connectivity. In this paper, we aim to address the problem neighbor discovery stage networking process. Then, are present a algorithm called scan based algorithm, or, SBA-RA. The difference between SBA-RA previous researches...

In this paper, we consider the problem of neighbor discover in three-dimensional wireless mobile ad hoc networks with directional antennas. A discovery algorithm named Limited Random Algorithm(LRA) is proposed paper. The difference between LRA and previous researches that assume no prior knowledge neighbors, takes advantage approximate location information neighbors obtained from global positioning system (GPS) or any other similar technologies, which not exact but fuzzy. applied to process...

Heterogeneous Internet of Things (HetIoT) has received widespread attention due to its provision various convenient services in fields such as smart cities, intelligent transportation, environmental monitoring and security systems. Due HetIoT inherently demands high data rates, bandwidth, low latency, the application millimeter-wave (mmWave) unmanned aerial vehicle (UAV) emergency base station (ABS) providing users become a low-cost efficient means. However, sensitivity mmWave obstacles...

This article investigates the problem of synchronous randomized neighbor discovery with directional antennas. Due to long tail effect, it will take time discover last few neighbors, which increases overall time. effect is due small proportion remaining undiscovered neighbors. Moreover, improper choices reception probabilities make even worse. In this article, a cognitive framework proposed minimize expectation We present scheme in are dynamically adjusted. consider an ideal scenario and...

OFDM is one of the best physical-layer candidates for cognitive radio (CR) systems, but rectangular pulse shaping gives rise to large spectrum sidelobes and interferes with licensed user on adjacent band. In this paper, an approach derived based signal continuity measure spectral decay rate OFDM. And a novel family pulses, power sech function, proposed suppress out-of-band radiation. Several functions are applied system compared through illustration.

Bit error rate (BER) performance of the OFDM system has been widely studied on multi-path fading channel with gain being modeled as various distributions. But statistical distribution signal receiver side neither well studied, nor given close- formed expression. In order to design optimum detection criteria, especially for hypothesis test symbol, probability density function (pdf) received is presented in this paper. At first, pdf frequency domain impulse response derived through...

In spectrum pooling applications, the spectral leakage of DFT-based OFDM systems should be divided into two parts, in-band-out-of-subband (IBOSB) and out-of- band (OOB) radiation. A scheme is proposed to suppress IBOSB redistribute OOB radiation through frequency domain correlative coding with appropriate weighting. It introduces correlation between adjacent subcarriers, reshaped mutually cancelation sidelobes. The optimum weighting factor given. Analysis simulation show that significantly...