A novel compact ultrawideband (UWB) multiple-input-multiple-output (MIMO) antenna system with dual polarization and band-rejection capabilities is proposed. The proposed MIMO consists of two quasi-self-complementary (QSC) elements. elements are arranged orthogonally fed perpendicularly to obtain diversity. High isolation can be achieved without additional decoupling structure owing the inherent advantage self-complementary structure. Notched band at WLAN realized by etching a bent slit in...

Dynamic spectrum access has been a subject of extensive study in recent years.The increasing volume literature calls for deeper understanding the characteristics current utilization.In this paper we present detailed measurement study, with data collected 20MHz to 3GHz band and at four locations concurrently Guangdong province China.We examine first second order statistics data, including channel occupancy/vacancy statistics, utilization within each individual wireless service, temporal,...

Dynamic spectrum access has been a subject of extensive research activity in recent years. The increasing volume literature calls for deeper understanding the characteristics current utilization. In this paper we present detailed measurement study, with data collected 20MHz to 3GHz band and at four locations concurrently South China. We examine first second order statistics data, including channel occupancy/vacancy statistics, utilization within each individual wireless service, temporal,...

In recent years, the excessive energy consumption in wireless communication systems has been increasingly critical, and environmental financial considerations have motivated a trend technologies to resort renewable sources. Energy harvesting is considered as promising solution alleviate such issues received extensive attentions. this paper, we consider cognitive radio system with one primary user (PU) secondary (SU) both of their transmitters operate time-slotted mode. The SU, which harvests...

In this paper, we consider an energy harvesting cognitive radio (CR) system operating in slotted mode, where the secondary user (SU) has no wired power supplies and is powered exclusively by harvested from ambient environment. The SU can only perform either harvesting, spectrum sensing or data transmission at a time due to hardware limitation such that timeslot segmented into three non-overlapping fractions. Considering generalized multi-slot paradigm two types of fusion rules: decision...

In this correspondence paper, we focus on a cellular network aided an unmanned aerial vehicle (UAV) that serves as base station for multiple ground users. The UAV's trajectory design is investigated to maximize the expected uplink sum rate with inaccessibility user-side information, such locations and transmit power well channel parameters. problem formulated Markov decision process solved model-free reinforcement learning. Due continuous deterministic action space, policy gradient (DPG)...

In this paper, we focus on a downlink cellular network, where multiple UAVs serve as aerial basestations to provide wireless connectivity ground users through frequency division multi-access (FDMA) scheme. The are exclusively powered by charging station located the following save-then-transmit protocol. such UAV-assisted joint optimization for user association, resource allocation and basesation placement investigated maximize sum rate. problem is formulated mixed integer thus challenging...

A tri-polarized antenna with diverse radiation characteristics is proposed in this paper. This design mainly consists of two pairs loop radiating dipoles and an omnidirectional monopole element, which are used for the fifth generation (5G) vehicle to everything (V2X) communications, respectively. By adding eight inverted L-shaped patches unequal sizes around dipoles, wide beamwidths both E- H-planes can be obtained across desired lower upper frequency bands. Furthermore, by employing...

In this article, we focus on a downlink cellular network, where multiple unmanned aerial vehicles (UAVs) serve as base stations for ground users through frequency-division access (FDMA). With user locations and channel parameters inaccessible, the UAVs coordinate to make decision resource allocation trajectory design in decentralized way. Aiming at optimizing both overall fairness throughput, model partially observable Markov process (Dec-POMDP) propose multiagent reinforcement learning (RL)...

In this paper, we focus on a UAV-assisted cooperative communication system based simultaneous wireless information and power transfer (SWIPT), where the UAV serves as relay its transmission capability is partly powered by radio signal from source via time-sharing mechanism. We study end-to-end throughput maximization problem optimizing UAV's decision profile, profile trajectory for both amplify-and-forward (AF) decode-and-forward (DF) protocols. The decomposed into three optimization...

In this letter, we focus on a multiuser OFDM system with capability of simultaneous wireless information and power transfer (SWIPT), where are transferred separately different subcarriers. The optimal design for resource allocation (i.e., subcarrier assignment) is investigated to maximize the sum rate minimum constraint. problem formulated as mixed integer programming both suboptimal solutions well computational complexity investigated. By comparing proposed subcarrier-separation (SS) scheme...

In this paper, we focus on a typical cooperative communication system with one pair of source and destination, where unmanned aerial vehicle (UAV) serves as mobile relay while flying from start location to an end location. With simultaneous wireless information power transfer (SWIPT), the UAV's transmission capability is powered exclusively by radio signal transmitted via time-sharing mechanism. such system, study end-to-end throughput maximization problem for amplify-and-forward (AF)...

In this paper, we focus on a unmanned aerial vehicle (UAV)-assisted cooperative communication system with simultaneous wireless information and power transfer (SWIPT), where the UAV serves as mobile relay is powered by radio signal from source via power-splitting mechanism. We study end-to-end throughput maximization problem optimizing UAV's profile, ratio profile trajectory for both amplify-and-forward (AF) decode-and-forward (DF) protocols. The decomposed into two subproblems: 1)...

Power system state estimation is a critical task for ensuring stable grid operation and serves as the foundation of control analysis. Conventional approaches largely involve field measurements, network topology, manual anomaly detection, which present significant limitations, particularly while dealing with dynamic complex power systems. In recent years, deep learning techniques have been progressively applied in this to overcome shortcomings conventional approaches, are based on...

Recognizing defect patterns in semiconductor wafer bin maps (WBMs) poses a critical challenge the integrated circuit (IC) manufacturing industry. The accurate classification and segmentation of these are utmost significance as they key to tracing root causes defects, thereby reducing costs enhancing both product efficiency quality. As process grows complexity, WBM becomes intricate when multiple coexist on single wafer, making recognition task increasingly complicated. In addition,...

Cognitive radio (CR) for dynamic spectrum sensing and access has been a hot research topic in recent years. To avoid collision with the primary users, secondary users need to sense channels before transmitting on them, which is referred as time overhead. Our previous work shows that spectral correlations between within same service are sufficiently high accurate prediction, can further be used reduce time. With such motivation, this paper, we propose new definition, i.e., channel...

A novel dual-wideband complementary patch antenna with a dual-layer cross-magneto-electric (ME)-dipole structure is proposed for 2G/3G/LTE/WLAN applications. In order to provide and characteristics, an inverted U-shaped feeding introduced feed cross-ME-dipole patches. The upper-layer patches mainly serve the upper frequency band, while lower-layer ones chiefly work lower band. addition, hook-shaped are placed on corner of electric dipoles broaden impedance bandwidth Moreover, box-shaped...

In this correspondence, we focus on a UAV-assisted downlink cellular network, where UAV serves as an aerial basestation (BS) and is powered by wireless charging station located the ground, jointly optimize resource allocation BS placement to maximize common throughput for two sharing schemes: time division multiple access (TDMA) frequency (FDMA). Through alternate optimization, are separately optimized iteratively improve throughput. For allocation, derive closed-form solutions both TDMA...

In this letter, we focus on a downlink wireless network aided by an unmanned aerial vehicle (UAV), which has to be recharged periodically at fixed depot before providing communication service ground users (GUs), and aim maximizing the minimum average rate among all GUs over each cycle jointly optimizing UAV's time allocation between recharging service, flight trajectory transmit power allocation. Such problem is formulated considering 3-D design practical model for its mechanical energy...

In this letter, we consider a cooperative sharing model for cognitive wireless powered communication networks (CWPCNs), which leverages the notion of cooperation between primary and secondary systems in radio to accomplish transmission early vacate opportunity transmission. With proposed spectrum model, investigate optimal design such CWPCN with both amplify-and-forward (AF) decode-and-forward (DF) protocols maximize its uplink energy efficiency. The efficiency optimization problem is...

As an unlicensed wireless system, how to discover idle spectrum-bands efficiently and handover minimize interferences primary (licensed) users is the main focus for Cognitive Radio (CR). Therefore, prerequisite being "cognitive" lies in a deeper understanding of characteristics current spectrum behavior, such as better model behavior prediction, so design more efficient sensing access schemes secondary CR. A practical learning method based on Multilayer Perception (MLP) artificial neural...

In this paper, we introduce channel prediction to wireless communications aided by intelligent reflecting surface (IRS) in order reduce the overhead brought full estimation. Hopefully, fine-grained control of reflection coefficients on IRS can still be maintained with sufficiently accurate prediction. Innovatively, consider as an analogy image super-resolution computer vision since elements are normally two-dimensionally arranged, which makes popular deep learning techniques efficient...

Energy harvesting is considered as a promising solution to efficiently prolong the lifetime of energy-constrained wireless networks. In particular, energy harvesting, which scavenges from ambient radio signals, has recently received an increasing attention. this paper, we consider self-powered system with one transmitter and receiver, in no fixed power supplies extract only via signals. It assumed that follows save-then-transmit protocol, specifies fraction (referred save-ratio) time devoted...

In this paper, we consider a CR system operating in slotted mode, which the SU has no fixed power supplies and extract energy only via wireless harvesting from ambient radio signal. It is assumed that operates saving-sensing-transmitting (SST) fashion, partitions timeslot into non-overlapping fractions for three operations. Considering tradeoff between durations of saving, sensing transmitting, focus on optimal structure operations maximizes achievable throughput. By formulating throughput...