The ubiquity, large bandwidth, and spatial diversity of the fifth generation (5G) cellular signal render it a promising candidate for accurate positioning in indoor environments where global navigation satellite system (GNSS) is absent. In this paper, joint angle delay estimation (JADE) scheme designed 5G picocell base stations (gNBs) which addresses two crucial issues to make both effective efficient realistic environments. Firstly, direction-dependence array modeling error gNB as well its...

Channel-state-information-based localization in 5G networks has been a promising way to obtain highly accurate positions compared previous communication networks. However, there is no unified and effective platform support the research on algorithms. This paper releases link-level simulator for localization, which can depict realistic physical behaviors of positioning signal transmission. Specifically, we first develop simulation architecture considering more elaborate parameter...

Owing to the ubiquity of cellular communication signals, positioning with fifth-generation (5G) signal has emerged as a promising solution in global navigation satellite system-denied areas. Unfortunately, although widely employed antenna arrays 5G remote radio units (RRUs) facilitate measurement direction arrival (DOA), DOA-based performance is severely degraded by array errors. This article proposes an situ calibration framework user terminal (UT) transmitting reference signals at several...

Line-of-sight (LOS)/Non-line-of-sight (NLOS) identification in wireless communication systems is crucial for positioning, mobile communication, and sensing. Conventional LOS/NLOS approaches generally employ channel features, such as the Rice factor, kurtosis of received power, etc. However, these have limited accuracy cannot function efficiently a dynamic environment. The deep learning approach can show better performance; however, it has high computational complexity issues. In this study,...

A method for estimating the 2-D direction- and time-of-arrival of orthogonal frequency division multiplexing (OFDM) signals that utilizes only three antennas is proposed. An array manifold matrix first constructed not based on symmetry circular geometry but also time diversity every OFDM subcarrier, so aperture can be greatly increased. virtual spatial smoothing then used to partition into structurally identical sub-array matrix, coherent multipaths correctly estimated by incorporating...

The two-step weighted least squares (TSWLS) estimator is a well-known linear approach for TDOA-base localisation. It has been applied to various applications and also widely used as benchmark in subsequent studies. In this reported work, it revealed that the approximation weighting matrix of second-step WLS crucial factor performance TSWLS, TSWLS improved simple computational attractive way through reference anchor selection co-ordinate rotation. enhanced method called turbo-TSWLS....

The multiple signal classification (MUSIC) algorithmis computationally expensive in the application to joint two-dimensional (2-D) direction-of-arrival (DOA) and time-of-arrival (TOA) estimation based on uniform circular array (UCA) using orthogonal frequency-division multiplexing (OFDM) signal. This letter proposed an efficient way compute 3-D spatial-temporal spectrum. We extended manifold separation technique, by which we obtained discrete Fourier transform (DFT) form of On this basis,...

An attractive and challenging problem in source localisation is to locate a target three‐dimensional (3D) space using single station. To satisfy the observability requirements achieve higher accuracy, authors draw on idea of inverse synthetic aperture radar for single‐station localisation, which leverages mobility time serial measurements angle arrival (AoA) difference (TDoA). A closed‐form pseudo‐linear estimator (PLE) developed estimate both 3D position velocity mobile through...

In most mobile-assisted localization schemes, mobile anchors follow predefined or random trajectories to send beacon messages around. Although working well in regular and uniform networks, lead wasted efforts irregular non-uniform deployment. We propose a novel scheme of trajectory design by utilizing the topology information network. Based on rigidity theory, original network is first partitioned into units as localizable subnets orphan nodes. The shortest path traversing all then chosen...

Full-duplex (FD) communication provides new opportunities for improving the throughputs of networks. However, this condition means that number senders increases from one to two within a certain range. We have arrange nodes send frames simultaneously in media access control (MAC) layer. For single-hop network model, using FD features and cut-through mechanism, we propose an MAC protocol. The protocol improves throughput following aspects. On hand, during transmission each node, based on...

The Radio Interferometric Positioning System (RIPS) is a phase-based localization scheme that achieves high accuracy with low-cost devices. Indoor RIPS is, however, challenge due to dense multipath. In this paper, we propose holographic radio interferometry (HRI) cope multipath effect. HRI builds hologram out of phase measurements in for the mobile target. It built on an important observation spatial diversity induced by resembles random noise. We implement GNU Radio/USRP N210 and test it...

The radio interferometric positioning system (RIPS) is a novel solution used in wireless sensor networks. This letter explores the ranging accuracy of RIPS two configurations. In linear step-frequency (LSF) configuration, we derive mean square error (MSE) maximum likelihood (ML) estimator. random (RSF) introduce average MSE to characterize performance ML simulation results fit well with theoretical analysis. It revealed that RSF superior LSF former more robust jamming environment similar accuracy.

The wireless full-duplex (FD) nodes can transmit and receive at the same time using frequency-band. Currently, latest FD media access control (MAC) protocols mainly focus on how to convert physical layer gains of throughput gain networks, but pay little attention energy consumptions nodes. In this paper, we propose an efficient MAC protocol. According values self-interference cancellation coefficients corresponding each pair signal propagation attenuation, proposed protocol adaptively select...

Received signal strength (RSS) ranging in multipath environments suffers from two major drawbacks: laborious training and poor accuracy. Based on the observation that frequency‐squared weighted RSS is periodic with respect to carrier frequency, cancellation by frequency diversity (MCFD) proposed, which a novel training‐free approach makes measurements at multiple frequencies combines them together cancel out effect. Simulations experimental results common scenarios for ground‐deployed...

A peak‐to‐peak (P‐to‐P) search‐based single source direction of arrival estimation is proposed. The P‐to‐P method aims to search only at each local minima a least square cost function, thus quickly acquiring the global optimal solution relative exhaustive grid search. Performance comparisons with existing methods verify that proposed achieves high accuracy, possesses low signal‐to‐noise ratio threshold and computational can be applicable any non‐uniform linear array.

The lack of sufficient spectral resources in many alternative positioning, navigation, and timing (APNT) systems for aviation has led to the problem mutual interferences. Building APNT system with cognitive radio frequency-hopping (FH) techniques can resolve above problem, however, main challenge is achieve a long high-precision range high-speed FH signals. In this paper, we propose novel ranging method called time–frequency matrix (TFMR), which based on Using TFMR method, built...

Time synchronization is a crucial mechanism for wireless sensor networks, so it natural target of the adversaries. Errors in data aggregation and failures other mechanisms will happen as result imprecise time synchronization. The well-known mu TESLA protocol can be employed to authenticate broadcast packets secure mechanisms. Unfortunately, nodes base station should loosely synchronized function. It appears dilemma that required achieve A separate some scheme just escape from such dilemma....

Multicarrier phase ranging (MCPR) technique has been widely used in radio navigation, telemetry, radar, and many other fields. In an MCPR system, unique range estimation can be obtained within only the so-called unambiguous distance (UD) because of ambiguity. As a metric gauging, measurable UD well studied under two common configurations: linearly spaced frequencies proportionally frequencies. this paper, we propose to apply frequency hopping (FH) waveform systems for enhanced antijamming...

In cognitive radio networks (CRNs), spectrum sensing is critical for guaranteeing that the opportunistic access by secondary users (SUs) will not interrupt legitimate primary (PUs). The application of full-duplex to enables SU carry out and transmission simultaneously, improving both awareness CRN throughput. However, issue with radios deployed in heterogeneous environments, where SUs may observe different activities, has been addressed. this paper, we give a first look into problem develop...

Channel-state-information-based localization using 5G systems has been a promising way to achieve high-accuracy positioning results compared previous communication systems. However, current simulation platforms neglect the impact of hardware impairments and RF environment on localization. Therefore, designing unified effective link-level platform is very important evaluate performance advanced algorithms. This paper releases simulator for localization, where all modules are closely...

PDF HTML阅读 XML下载 导出引用 引用提醒 一种能量有效的传感器监测网络成簇协议 DOI: 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: An Energy Efficient Clustering Protocol for Surveillance Sensor Networks Author: Affiliation: Fund Project: 摘要 | 图/表 访问统计 参考文献 相似文献 引证文献 资源附件 文章评论 摘要:提出了一种分布式能量有效的传感器监测网络成簇协议EECTS(energy-efficient clustering protocol target surveillance).在该协议中,节点根据邻居节点的分布情况以及自己的剩余能量来竞争簇首.为了降低簇首的能量消耗,簇首间形成一个以基站为根的最小生成树,将监测到的数据通过多跳方式直接发送到生成树的上游节点.由于监测网络的首要任务是能够对移动目标进行不间断的监测,此协议还提出了一种簇内调度方法EECTS-1,可监测到网络中的大部分区域,并在此基础上...

In this paper, we propose a novel approach to measuring ground surface displacement at high accuracy by radio interferometric ranging (RIR) with extremely low-cost devices. A major challenge RIR in accurate measurement is multipath mountainous environments. We scheme called Downslope Interferometric Phase (DIP) decouple the effect of reflective path from that line-of-sight path. With two-path channel model, find errors DIP fluctuate periodically respect frequencies. Based on such revelation,...

In recent years, secret key generation method based on the physical layer of wireless channel has been widely studied. Since Channel State Information (CSI) is a fine-grained characterization information, there are currently many studies using CSI for generation. However, existing extraction tools have problem that time interval between uplink and downlink interaction uncertain, which may result in insufficient reciprocity CSI. this paper, we propose measurement response mechanism IEEE...