Nonorthogonal multiple access (NOMA) exhibits superiority in spectrum efficiency and device connections comparison with the traditional orthogonal technologies. However, nonorthogonality of NOMA also introduces intracell interference that has become bottleneck limiting performance to be further improved. To coordinate interference, we investigate dynamic user scheduling power allocation problem this paper. Specifically, formulate as a stochastic optimization objective minimize total...

This letter investigates the relay selection problem for air-to-ground vehicular ad hoc networks (A2G VANETs). Specifically, we use unmanned aerial vehicle (UAV) to enhance VANETs communications and network performance. For considered network, calculate state transition probability (STP) of communication interruption transmission consumption (TC) including energy delay consumption. Afterward, formulate as a multi-objective optimization by jointly considering STP TC. tackling this hard...

In air-to-ground unmanned aerial vehicle (UAV) communications, an accurate channel propagation model is very important for the evaluation and design of communication systems. For this purpose, we have conducted several measurement campaigns in airport area at UHF- L-band (around 433 MHz 1.518 GHz). line-of-sight (LoS) case, give distance-dependent pathloss models both frequenciy bands. Meanwhile, it found that measured LoS scenario has a good agreement with two-ray short link distances. This...

A reader must be able to identify tags as quickly possible, so tag anti-collision is a significant issue for the RFID system. In this paper, we propose novel protocol (ACQT), which suitable large mobile environment. Based on 3-ary tree, it has optimal capacity tree-based protocols. Using combination query can solve problem of not being generate tree when length tag's ID multiple 3. The joining and leaving strategies efficiently applied mobility. simulation results show that present achieve...

The stiffened plate is one type of representative thin-walled structure consisting plates reinforced by varying stiffeners to strengthen its resistance buckling deformation. However, the mechanism which could efficiently improve such structures has not been well reported. Therefore, investigate and predict behavior accurately, a refined Reddy-type global-local model (RGLS) established firstly, can fulfill continuous condition in-plane displacement transverse shear stress among adjacent...

Coverage and connectivity are two of the most critical research subjects in WSNs, while regular deterministic deployment is an important strategy results some pattern-based lattice WSNs. Some studies optimal for generic values rc/rs were shown recently. However, these deployments subject to a disk sensing model, cannot take advantage data fusion. Meanwhile other adapt detection techniques fusion coverage enhance scheme. In this paper, we provide on patterns achieve information as variety...

With the upcoming commercialization of fifth generation (5G) mobile communication system, more and base stations (BSs) will be deployed in urban areas consume a large amount energy. Hence, order to study how reduce BS energy consumption provide larger connectivity range, we present measurement modeling campaign macro-cellular (UMa) scenario this paper. The channels were sounded at 3.5 28 GHz with maximun horizontal distance 240 meters, modern residential area. transmitter (TX) was equipped...

The unmanned aerial vehicle (UAV) channel models are very important and useful for the design evaluation of UAV communications. In existing works, terrestrial scatterers widely stationary or moving all time, is assumed to move at a constant speed. However, these modeling assumptions may not be appropriate in realistic scenarios. this work, we propose new 3-dimensional (3-D) dynamic non-wide-sense (non-WSS) cluster-based geometric model multiple-input multiple-output (MIMO) channels. We...

Aim to improve upper limb rehabilitation effect, we design and develop an Image-projective Desktop Arm Trainer (IDAT). Compared with conventional therapy, IDAT provides a more effective interesting training method. IDAT's goal is maintain patients' function by their eye-hand coordination. We select step-on interface (SOI) as the input system which makes trainees can operate hand directly. Trainees make customized setting. It provide motivation accomplishment enthusiasm interest. So much...

With the recent developments in RFID systems, many readers are needed to apply same work place, which easily leads reader collision. When communication with tags of a is disturbed by operation other readers, collision will occur, achieved less attention than tag previous studies. To solve several types collisions, we propose an efficient multi-channel avoidance (EMRCA) protocol, suitable for multiple system. After analyzing relationship between distance two and give solutions present...

The unmanned aerial vehicle (UAV) communication with the multiple-input–multiple-output (MIMO) system has attracted lots of attention to improve spectral efficiency and channel capacity. large antenna spacing is often required reduce spatial correlation between subchannels. However, this requirement cannot be well satisfied in practical scenarios due limited dimension UAV platforms. Therefore, polarization diversity a promising approach for MIMO systems. In work, we propose three-dimensional...

In the radio channels of cellular networks, signals generally propagate through multiple paths in scattering environments. Multipath Components (MPCs) are shown to be distributed different groups, known as clusters, Channel Impulse Responses (CIRs). Clustering MPCs is a critical step channel measurement and modeling. Many clustering algorithms have been proposed but few them able handle noise effectively. this paper, we propose de-noising MPC-clustering framework based on new...

Image-projective Desktop Arm Trainer IDAT is designed to improve the upper limb therapy effect. This paper focused on its design concept. The most important structural feature of that it non-invasive and unconstrained. Setting desk apart from trainee sitting makes no body contact. It works based trainee's voluntary movement, although has neither physical assist nor tactile feedback conventional systems. developed concept direct interaction critical in terms motivation increase. Instead a...

Network coding offers a promising platform for multicast transmission to improve the throughput. However, users may not collect full set of encoded packets recover useful information because its block processing property, leading low throughput under wireless fading channel. While schemes that using feedback from all receivers cover problem above always causes huge overhead in large network. Accordingly, this paper we proposed an adaptive sliding window random network coding(ASWRNC)...

Random network coding (RNC) is an efficient scheme at the layer to improve performance of wireless multicast networks. However, full set encoded packets may not be collected correctly decode original information in fading channels, leading low throughput. This issue will more severe multimedia transmission. On other hand, cooperative transmission that fully utilizes space diversity can effectively mitigate channel impairments. Accordingly, we proposed all-user cooperation scheduling based on...

With the integrated development of Internet, wireless sensor technology, cloud computing, and mobile there has been a lot attention given to research about applications Internet Things. A Wireless Sensor Network (WSN) is one important information technologies in Things; it integrates multi-technology detect gather network environment by mutual cooperation, using variety methods process analyze data, implement awareness, perform tests. This paper mainly researches localization algorithm nodes...

In recent years, Internet of Things (IoT) has experienced unprecedented development, and is widely applied in logistics, automatic scheduling other domains. various IoT applications, radio frequency identification (RFID) the center attention past few years. Similar to wireless devices, RFID tags are confronted with acute problem collision, which will fact affects system efficiency IoT. this paper, we propose a novel anti-collision algorithm for IoT, named UAV-based multiple protocol (UMTAP)....

The DC circuit breaker is the key equipment in power transmission and distribution system. IGCT devices have important application prospects breaking, providing advantages of large surge current capability low conduction losses. Aiming at on-off electrical characteristics IGCT, this paper provides optimized design method for improving turn-off reducing on-state voltage drop which GCT longitudinal optimization structure breaking conditions obtained. Meanwhile, compact modular application,...

Low-altitude communication has attracted lots of attention in recent years, and it is very important to obtain an accurate clutter loss model for evaluating designing such a system. For this purpose, we have conducted channel measurement campaign at 5.8 GHz suburban low-altitude scenario. Based on the measured pathloss, extract analyze different link distances elevation angles between transceiver. The validated by ITU with respect distance. Moreover, inspired unavailability low-frequency...

The mechanisms to maintain redundancy are essential distributed data storage in Unattended Wireless Sensor Networks (UWSNs). To address this challenge, we proposed a novel hybrid scheme, which takes the advantages of both Erasure Codes (EC) and Self-repairing (SRC) guarantee better security on maintenance, adapt an enhanced location-based pair-wise keys establishment based bivariate polynomials. Detailed analysis shows superiority scheme comparison with EC original SRC schemes, maintenance....

Signal coverage in the outdoor-to-indoor (O2I) scenario using sub-6 GHz (sub-6G) frequency band is an important research topic and network deployment issue for fifth generation (5G) mobile communication system. In this paper, we present a field measurement campaign typical urban microcell (UMi) O2I scenario. The base station (BS) was installed on top of five-story building user equipment (UE) located at 38 positions room four corridors seventh floor modern apartment building. By two ±45°...

Vehicle-to-infrastructure (V2I) access has been considered as an important scenario in the emerging heterogeneous networks. To improve link quality, V2I channel characteristics should be investigated carefully. In this paper, we conduct a measurement campaign for channels rural macrocell (RMa) at 3.5 GHz. We measured spatial propagation of multipath components (MPCs) up from roadside base station (BS) to vehicle. particular, have obtained azimuth and elevation angle arrival (AoA/EoA) by...

For the purposes of information security and privacy between readers tags, identity authentication is a significant issue for radio frequency identification (RFID) systems. In this study, authors propose novel group-based key array protocol, which suitable large scale RFID environment. Based on array, protocol can generate an each pair reader tag with lower storage. Adding identifier update phase, they design process passing formal analysis from GNY. The performance results show that present...

In This paper we proposed an improved routing metrics for wireless sensor networks (WSNs) based on Hybrid Energy Storage System (HESS) which merges Super capacitor (SC) and a Rechargeable Battery (RB). The scheme assigns different considering not only residual energy, harvesting rates expected path length of next hop, but also the potential future hops. Simulations results show that can obtain better delivery data packets while maintain low latency in some situation.