Energy harvesting (EH) is a promising technique to fulfill the long-term and self-sustainable operations for Internet of Things (IoT) systems. In this paper, we study joint access control battery prediction problems in small-cell IoT system including multiple EH user equipments (UEs) one base station (BS) with limited uplink channels. Each UE has rechargeable finite capacity. The modeled as Markov decision process without complete prior knowledge assumed at BS, which also deals large sizes...

In this paper, a novel indoor localization system with channel state information (CSI) fingerprints is proposed, which learns the spatial and frequency features of CSI in fifth-generation (5G) cellular network by Siamese convolution neural network. particular, considering that continuously collected moving target possesses implicit association, we locate successive data gathered within time interval can be regarded as an subspace fingerprint database. Therefore, modeled matching problem...

The WiFi-based fingerprint indoor-positioning system has attracted increasing interest from industry and academia, benefiting the widespread deployment of wireless local area network (WLAN) infrastructure. However, with expansion application scenarios, this suffers labor-intensive work for received signal strength (RSS) construction. In article, we propose a crowdsourcing-based radio map construction method trajectory matching algorithm to solve time-consuming preliminary data collection in...

We address the uniqueness problem in estimating directions-of-arrival (DOAs) of multiple narrowband and fully polarized signals impinging on a passive sensor array composed identical vector sensors. The data recorded such an present so-called "multiple invariances," which can be linked to CANDECOMP/PARAFAC (CP) model. CP refers family low-rank decompositions three-way or higher way (mutidimensional) arrays, where each dimension is termed as "mode." A sufficient condition derived for...

The Internet of Things (IoT) application has a crucial need for long-term and self-sustainable operations. Energy harvesting (EH) technique attracted great attention in IoT as it may significantly increase the network lifetime by using renewable energy sources. In this paper, we study simple system composed one base station (BS) multiple EH user equipments (UEs), where control is modeled Markov decision process without any prior knowledge assumed on dynamics. central controller, i.e., BS,...

A 3-D arbitrary-elevation two-cylinder reference model is proposed for multiple-input-multiple-output (MIMO) air-to-air communications in unmanned aerial vehicle (UAV) channels. This accounts not only the Line-of-Sight (LoS) but also single-bounced at transmitter (SBT) and receiver (SBR), as well double-bounced (DB) rays. Therefore, it endowed with a high adaptability to various UAV-to-UAV communication scenarios. From model, closed-form expression of space-time correlation function (ST-CF)...

Rapid and sensitive detection of 2-ethylhexanol vapor, a critical indicator overheating in electrical cables, is essential for the early warning potential fires. However, traditional chemiresistive gas sensors are inadequate real-time owing to its chemical stability. Herein, sensor based on mesoporous Nd-doped In2O3 designed rapid ppb-level vapor. The exhibits high response (22.8@1 ppm), excellent sensitivity (4.7 ppm–1), short time (29 s), low limit (760 ppb). After Nd doping, approximately...

In May 2023, the Chinese Stomatological Association promulgated group standard of "Clinical Practice Specifications for Permanent Tooth Extraction". These specifications were formulated after repeated discussions and revisions guided by relevant literature opinions well-known experts in field across country. However, content is not elaborated limited to its writing form requirements. As a consequence, medical workers might easily understand comprehend knowledge points, which also limits...

Air pollution is a serious global issue impacting public health and social economy. In particular, exposure to small particulate matter of 2.5 microns or less in diameter (PM2.5) can cause cardiovascular respiratory diseases, cancer. Fine-grained urban air quality monitoring crucial yet difficult achieve. this paper, we present the design, implementation, evaluation an ambient environment aware system, namely UbiAir, which support fine-grained through mobile crowdsensing on bike-sharing...

WiFi fingerprinting method is an attractive indoor positioning due to widely deployed access points (APs) and easily measured received signal strength (RSS). However, results are unstable because of the fluctuation RSS. Besides, pedestrian dead reckoning (PDR) relying on inertial sensors has been used in real-time tracking. Since PDR accumulated errors long distances tracking, this paper proposes a hybrid algorithm that integrates approach with further improve accuracy. There two key our...

In this paper, we propose a constructive interference (CI)-based block-level precoding (CI-BLP) approach for the downlink of multi-user multiple-input single-output (MU-MISO) communication system. Contrary to existing CI approaches which have be designed on symbol-by-symbol level, here constant matrix is applied collection symbols within given transmission block, thus significantly reducing computational costs over traditional CI-based symbol-level (CI-SLP) as CI-BLP optimization problem...

An arbitrary-elevation two-sphere reference model is utilized to mimic the unmanned aerial vehicle (UAV) air-to-air fading channels. The considers line-of-sight (LoS), single-bounced transmit (SBT), receive (SBR), and double-bounced (DB) rays. Based on this model, closed-form expression of space-time correlation function (ST-CF) obtained for first time under widely-used assumption von Mises-Fisher (vMF) distributed scatterers. To further improve model's adaptability realistic scattering...

In this paper, we develop a simple blind channel estimation algorithm for two-way relay network (TWRN) that consists of two terminal nodes and one node. We consider the frequency selective channels adopt orthogonal frequency-division multiplexing (OFDM) modulation to compensate inter-symbol interference (ISI). By applying non-redundant linear precoding at both terminals, propose an is effective estimating cascaded consistent with two-phase transmission protocols. The method remove inherent...

This paper studies the secure degree of freedom (SDOF) multiway relay wiretap system K-user MIMO Y channel, where each legitimate user equipped with M antennas intends to convey independent signals via an intermediate N antennas. There exists eavesdropper which is Ne close users. In order eliminate multiuser interference and keep security, alignment mainly utilized in proposed broadcast channel (BWC) multi-access BWC (MBWC), cooperative jamming adopted as a supplementary approach MBWC model....

MIMO transmission scheme equipped with cross linear polarization antennas has been widely used in mobile radio networks. However, some realistic measurement results show that circular polar also benefits live In this paper, the penetration capability for and is studied. Our theoretical analysis shows antenna higher than antenna. Moreover, campaign conducted to verify our analysis. It means application of will be a promising method outdoor indoor environments.

In this paper, we focus on the physical layer security for a $K$ -user multiple-input-single-output (MISO) wiretap channel in presence of malicious eavesdropper, where propose several interference exploitation (IE) precoding schemes different types eavesdropper. Specifically, case common eavesdropper decodes signal directly and Eve's full state information (CSI) is available at transmitter, show that required transmit power can be further reduced by re-designing `destructive region'...

For fingerprint-based localization, the time-consuming and labor-intensive construction of offline radio map is bottleneck which hinders its large-scale implementation. In this paper, we propose a extrapolation localization algorithm by exploiting angles delays specular multipath components. First, using concept virtual anchor nodes (VANs), calculate transmitter (VT) each component according to angle delay information measured at known point. By estimating positions reflector with these VTs,...

In this paper, the energy efficiency (EE) is focused and analyzed in device-to-device (D2D) communication underlaying cellular networks when resources are shared by D2D users three modes, namely, Non-Orthogonal Sharing mode (NOS), Orthogonal (OS), Cellular Mode (CM). addition, efficient power allocation schemes modes given under maximum transmission constraint. Numerical simulations performed a single-cell environment EE performance these simulated varying system parameters: a) distance...

In this paper, we study simultaneous wireless information and power transfer (SWIPT) in relay interference channels (ICs), where energy-constrained relays harvest energy from sources' radio-frequency signals use the harvested to forward destinations. We adopt splitting (PS) protocol alignment (IA) technique jointly realize management. propose two novel transmission schemes for SWIPT IC networks, namely, one-stage PS IA scheme two-stage scheme. For both schemes, investigate optimal ratios...