This paper demonstrates a prototype of selfsustained body area networks (BAN) sensor, which consists the electrically small triple-band rectenna, direct current (dc) energy management and storage module, microcontroller, sensing communication module. The proposed antenna is composed corrugated metal-insulator-metal plasmonic structures, covers triple frequency bands, including GSM-900, UTMS2100, TD-LTE bands. Its electrical size only 0.21 λ × 0.2 at 900 MHz. gains reach 1 dBi, 2.64 -0.19 dBi...

We propose a novel configuration of the finite-impulse-response (FIR) filter adapted by phase-dependent decision-directed least-mean-square (DD-LMS) algorithm in digital coherent optical receivers. Since fast carrier-phase fluctuations are removed from error signal which updates tap coefficients FIR filter, we can achieve stable adaptation filter-tap for higher-order quadrature-amplitude modulation (QAM) signals. Computer simulations show that our proposed scheme is much more tolerant to...

Delay tolerant networks (DTNs) recently have drawn much attention from researchers due to their wide applications in various challenging environments. Previous DTN research mainly concentrates on information propagation and packet delivery. However, with possible participation of a large number mobile devices, how maintain efficient dynamic topology becomes crucial. In this paper, we study the design problem predictable where time-evolving is known priori or can be predicted. We model such...

An ideal multimodal agent should be aware of the quality its input modalities. Recent advances have enabled large language models (LLMs) to incorporate auditory systems for handling various speech-related tasks. However, most audio LLMs remain unaware speech they process. This limitation arises because evaluation is typically excluded from multi-task training due lack suitable datasets. To address this, we introduce first natural language-based corpus, generated authentic human ratings. In...

How to assess the importance of predictors in systematic reviews (SR) prediction models remains largely unknown. The commonly used indicators for individual include parameter estimates, information entropy, etc., but they cannot be quantitatively synthesized through meta-analysis. We explored synthesis method a simulation study, which mainly solved following four methodological issues: (1) whether synthesize original values or ranks; (2) normalize ranks same dimension; (3) and how impute...

High Speed Railway(HSR) scenario was currently agreed as the main in 3GPP Rel.11 study item, Mobile Relay for E-UTRA. Usually, communications of high-speed railway systems suffer from problems such Doppler spread, radio condition abrupt change and handover failure. relay is a promising scheme to solve these problems, but quantitative performance improvement HSR has not been fully evaluated analyzed. In this paper, high speed with mobile integrated presented analyze issues LTE Advanced...

Correlations and mutual couplings in antenna arrays lead to performance deterioration of multiple-input-multiple-output (MIMO) systems. The relation between coupling correlation is complex, especially non-isotropic multipath environments. Reducing does not guarantee an eventual reduction the overall vice versa. In general, it a trivial task reduce simultaneously arbitrary this correspondence, planar metamaterial structure (PMS) array-antenna decoupling surface (ADS) are applied array for...

IoT systems typically involve separate data collection and processing, face the scalability issue when number of nodes increases. For some tasks, only result fusion is needed. Then, whole process can be realized in an efficient way, integrating one step by over-the-air computation (AirComp). Its shortcoming, however, signal distortion channel gains are different, which cannot well solved transmission power control alone times deep fading. To address this issue, paper, we propose a multi-slot...

Recent advances in Delay Tolerant Networks (DTNs) allow delivering packets among mobile devices via opportunistic communications during intermittent contacts. However, the lack of rich contact opportunities still causes poor delivery ratio and long delay DTN routing, especially for large-scale networks. Deployment additional stationary throwboxes can create a greater number opportunities, thus improve performance routing. locations deployed are critical to such improvement. In this paper, we...

In this paper, wireless power transfer (WPT) strategies to maximize information throughput are studied for cooperative relay systems, where the has harvest energy from radio frequency signals in order help source transmit destination. First, performances of three basic WPT schemes, WPT, destination and joint is analyzed. Then, a given transmission duration, optimal parameters system these schemes provided. With distances relay, we propose an strategy two suboptimal strategies. Finally,...

In this letter, a recently conducted measurement campaign in two suburban scenarios for investigating the low-height air-to-ground channels is presented. A universal-software-radio-peripheral-based channel sounder on-board an unmanned aerial vehicle (UAV) was exploited to record real-time downlink signals of live Long Term Evolution networks. Several horizontal flights at different heights were campaign. Channel impulse responses (CIRs) links from UAV cells extracted by exploiting...

To enhance the preparedness of federal and state agencies to effectively manage or recovery efforts in response a broad spectrum emergencies, we propose hybrid adaptive network that will adopt currently available off-the-shelf wireless devices integrate them quickly into scalable, reliable, secure with minimum human intervention for configuration management. This model serve as framework various rescue missions securing distributing critical resources. We investigate different technologies...

In typical sensor networks, data collection and processing are separated. A sink collects from all nodes sequentially, which is very time consuming. Over-the-air computation, as a new diagram of integrates in one slot: transmit their signals simultaneously the analog wave done air. This method, although efficient, requires that arrive at sink, aligned signal magnitude so to enable an unbiased estimation. For far away with low channel gain, misalignment unavoidable. To solve this problem,...

In this paper, the impact of imperfect beam alignment (IBA) on millimeter wave (mmWave) wireless power transfer (WPT) is investigated. We consider a mmWave WPT network, where location energy transmitters follows Poisson point process. Instead mostly used flat-top antenna model, we adopt Gaussian model suggested by 3 rd Generation Partnership Project (3GPP) for better accuracy. Two error (BAE) models, i.e., truncated and uniform are introduced to represent different BAE sources. derive...

With the rapid development of tunnel construction, more and long tunnels are being designed built. In contrast to ordinary tunnels, characterized by large construction distances difficult ventilation. this study, gallery ventilation systems in were studied. Combined with CFD software FLUENT, a three-dimensional model double was established, numerical simulation analysis flow field carried out optimized We found that main circulation air formed jet fan, which installed near flow-in tunnel....

In modern energy harvesting sensor nodes, nonvolatile SRAM (nvSRAM) has been widely investigated as a promising on-chip memory architecture because of its zero standby power, resilience to power failures, and fast read/write operations. However, conventional approaches transfer all data from into NVM during the backup process. Thus, large storage capacitors are normally required. addition, high peak inrush current is generated instantaneously, which negative impact on efficiency circuit...

To reduce strong mutual interference between unmanned aerial vehicles (UAVs) and ground base stations (GBSs) to balance the quality of service (QoS) cell-center cell-edge users, in UAV-assisted millimeter wave (mmWave) cellular networks we let UAVs serving as (ABSs) keep a certain distance from GBSs. It is assumed that GBSs are distributed by Poisson point process (PPP) on ground, location modeled hole (PHP) at altitude. Based preserving neighbor approximation method, nearest distribution...

The time-varying feature of wireless channels usually makes the hard delay bound for data transmissions unrealistic to guarantee. In contrast, statistically-bounded with a small violation probability has been widely used quality-of-service (QoS) characterization and evaluation. While existing research on statistical-delay control mainly focused single-hop links, in this paper we propose QoS-driven power-allocation scheme over two-hop relay links statistically upper-bound end-to-end...

Harvesting energy from the radio-frequency (RF) signal is an exciting solution to replenish in energy-constrained wireless networks. In this paper, amplify-and-forward (AF) based relay network considered, where nodes need harvest source's RF forward information destination. To improve performance of transmission, we propose two distributed selection protocols, Maximum Harvested Energy (MHE) protocol and Signal-to-Noise Ratio (MSNR) protocol. Then, derive outage probabilities system with our...

Over-the-air computation is a promising technique for efficiently aggregating data in sensor networks. This method requires that signals from all nodes arrive at the sink aligned signal magnitude, which faces reliability issue, especially times of channel fading. To solve this problem, letter, we propose an amplify-and-forward based relay, <underline xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Coherent</u>...