This paper proposes a vision-based unmanned aerial vehicle (UAV) chasing system that can be embedded in pursuer UAV (pUAV) to protect the attack from an evader (eUAV). The proposed consists of two parts, i.e., tracking and control signal generation parts. Combining deep learning-based object detector, <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">you only look once</i> version three (YOLOv3), existing trackers, algorithm improve performance...

Integrated sensing and communication (ISAC) is one of the promising technologies for future wireless systems. The ISAC expected to mitigate interference between radar systems scarce frequency band resources problem. By integrating two heterogeneous systems, namely a system system, hardware cost can be reduced compared implementing individual In this study, are surveyed categorized by configurations: ISAC, target, users. With related work, each case discussed. Further recent work on then...

In this study, an intelligent reflecting surface (IRS)-aided space–time line code (STLC) system is examined to efficiently extend its coverage area. The IRS phase-shift values of each element can be designed using a semidefinite relaxation (SDR) method maximize the received signal-to-noise ratio IRS-STLC systems. A unit-modulus constraint (UCR) proposed reduce computational complexity SDR method. numerical results verify that UCR-based achieve comparable bit-error-rate performance SDR-based...

The intelligent reflecting surface (IRS) technology can be combined with the space-time line code (STLC) to reduce channel estimation overhead for adjusting IRS phase shifts. However, computational complexity design shift values of elements increase prohibitively increment elements. To IRS-aided STLC system, we propose a modified block coordinate descent (MBCD) algorithm that simply IRS. proposed MBCD dramatically no compromise performance compared various existing methods, such as...

In this study, the performance of intelligent reflecting surfaces (IRSs) with a discrete phase shift strategy is examined in multiple-antenna systems. Considering IRS network overhead, achievable rate model newly designed to evaluate practical system performance. Finding optimal resolution shifts and corresponding vector an NP-hard combinatorial problem extremely large search complexity. Recognizing trade-off between passive beamforming gain signaling overheads, incremental method proposed...

This paper demonstrates the implementation of a space–frequency line coded-orthogonal frequency-division multiplexing (SFLC-OFDM) system. The SFLC-OFDM system utilizes downlink channel state information at transmitter, which can be obtained from uplink estimation under reciprocity assumption between uplink-and-downlink channels. However, in practical implementations, is violated due to imperfect synchronization and radio frequency chain mismatch transceivers. To recover reciprocity,...

In this paper we treat rate-compatible punctured low-density parity-check (RCP-LDPC) codes. We show how a mother code can be efficiently to achieve good performance over wide range of rates and discuss the design code. While approach applied virtually any time-varying channel, apply it ultra band (UWB) e.g. 802.15.3a, that RCP-LDPC codes perform well as compared selection fixed rate unpunctured They reduce implementation complexity enable use retransmission protocols based on incremental...

This study proposes a novel transmit antenna selection (TAS) method for improving communications between the unmanned aerial vehicle (UAV) and ground station (GS). By selecting an appropriate UAV antenna, signal-to-noise ratio (SNR) at GS can be significantly enhanced. However, obtaining necessary channel state information is challenging due to UAV's movement resulting variations. To overcome this challenge, we propose innovative approach that leverages convolutional neural network predict...

This paper proposes a new control scheme of lithium polymer battery units, based on single phase multi-level converter. In the DC/AC converter applications using storage system, it is necessary to balancing voltage individual units for high efficiency utilization Using proposed scheme, applied system. To verify effectiveness computer simulation and experimental work are accomplished. simulation, lithium-polymer system modeled carried out Psim program. And also results will be presented...

In wideband communication systems, the Doppler shift of radio signal should be modeled as a frequency-varying quantity, not constant. Accordingly, we studied effect (FV-DS) on orthogonal time-frequency space (OTFS) systems. From analysis, it is shown that FV-DS generates bandwidth proportional interferences across delay domain. Furthermore, simulation results verified bit-error-rate performance OTFS systems degraded due to FV-DS-induced interferences. Based this study, concluded an...

This study proposes a transmit antenna selection (TAS) method. The proposed TAS selects based on the predicted channel quality by using convolutional neural network (CNN)-based multi-class classification. designed CNN directly determines index past signal-to-noise ratio (SNR), which is obtained through received signals before transmission. Since states vary over time, future SNRs are implicitly CNN, and predictive explicitly determined. Here, channels in receiving transmitting periods...

In this study, an intelligent reflecting surface (IRS)-aided space-time line coded system is considered. The IRS phase shift methods maximizing the instantaneous signal-to-noise ratio (SNR) can achieve near-optimal beamforming performance but require high signaling overhead to obtain every channel state information. average SNR reduce while gain degraded. Considering overheads and gain, weighted sum-rate modeled compare maximization methods. Simulation results show that as line-of-sight path...

A channel shuffling (CS) technique was recently proposed for double space–time line code (DSTLC) systems. The CS-DSTLC transmitter generates the DSTLC signals with optimally shuffled channels that maximize received signal-to-noise ratio (SNR). As a result, can dramatically improve existing bit-error-rate performance only slight additional computation at transceiver. This study explicitly derives average SNR lower bound of system.

Lattice reduction aided detection schemes have been proposed to enhance the performance of multiple-input multiple- output (MIMO) systems. We combine linear detections such as zero-forcing (ZF) and minimum mean square error (MMSE) with lattice improve little complexity increase. requires a quantization detect signals. The errors in this step degrade bit rate. In paper, we propose correction algorithm perform simulations verify our results.

테라헤르츠 통신 시스템이 갖는 경로 손실 문제를 개선하기 위해, 다수 수동소자로 구성된 지능형 반사 표면(IRS: intelligent reflecting surface) 연구가 활발히 이루어지고 있다. 한편, 최대 공간 다이버시티 이득을 제공하는 시공간 선 부호(STLC: space-time line code)에 IRS를 적용하여 수신기 채널 추정 부담을 줄이는 최근 제안되었다. 하지만 실시간 정보를 활용하는 기존 IRS 위상제어는 및 시그널링 오버헤드가 위상제어 소자 수에 비례하므로 매우 많은 수의 소자로 대규모 시스템에 적용이 어렵다. 본 연구에선 무관한 새로운 격자 기반 위상 할당 기법을 제안한다. 제안하는 기법은 주어진 커버리지를 균일 크기 격자로 나누고, 각 격자에 대해 최적인 벡터를 설계하여 제어기에 저장한다. 이때 제어기는 수신기로부터 정보만을 피드백 받아 저장된 할당하여, 수가 아닌 설계한 개수에 비례하는 오버헤드를 갖고, 커버리지 확보를 위한 최소 수를 줄일...

In this study, we examine eight different object trackers for UAV chasing. The chasing algorithm employs version three of you only look once (YOLOv3) and the considered tracker. Following an tracking benchmark, success rate, precision, complexity were compared. From numerical results, it was shown that proposed with a tracker achieves improved performance less computational complexity.

Wireless sensors are becoming essential in machine-type communications and Internet of Things. As the key performance metrics, spectral efficiency as well energy have been considered while determining effectiveness sensor networks. In this paper, we present several power-splitting solutions to maximize average harvested under a rate constraint when both information power transmitted through same wireless channel (i.e., receiver). More specifically, first designed optimal dynamic policy,...

본 연구는 공간 다이버시티 이득을 얻는 시공간 선 부호화 시스템을 위한 CFO·STO·SCO 추정 및 보상 기법을 제안한다. 송신단은 상향링크와 하향링크 채널 사이 대칭성을 가정하고 추정한 상향링크 정보로 인코딩을 수행한다. 하지만, CFO·STO·SCO로 인한 비대칭성 발생으로, STLC 한 경우, 통신에 있어 확보할 수 없다. 이에 연구에서는 CFO·STO를 효과적으로 보상하는 이중 기법과 SCO 잔여 위상 오차에 대한 추가 제시한다. 또한, 소프트웨어 모뎀 기반 SISO 시스템 테스트베드를 구축하여 제안하는 통해 대칭성이 확보됨을 실험적으로 검증한다.