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Asynchronous and cyclostationary impulsive noise can severely impact the bit-error-rate (BER) of OFDM-based powerline communication systems. In this paper, we analyze an adaptive nonlinear analog front end filter that mitigates various types of impulsive noise without detrimental effects such as self-interference and out-of-band power leakage caused by other nonlinear approaches like clipping and...
In through-the-wall target localization area, wall effect including absorption and refraction will arise, wall effect needs to be compensated. If wall parameters including thickness and dielectric constant are exactly known, the target can be compensated to its correct position. In this paper, based on the transmitting model of through-the-wall radar, we deduced the Cramer-Rao lower bound (CRLB) of...
Silicon PhotonMultipliers (SiPM) have recently been proposed for Time-of-Flight ranging applications thanks to their high gain and excellent performances in terms of timing resolution. This work reports on the preliminary evaluation of a SiPM-based receiver for a Time-of-Flight (ToF) range meter at different ambient light intensities. A low-power 10-MHz picosecond pulsed laser was used as a light...
Aiming at the demand for precise positioning of underwater device in marine controllable source electromagnetic (CSEM) exploration system, an underwater acoustic positioning method with one shipborne interrogator and two GPS buoys is proposed. Using numerical simulation method, the influence of ranging deviation and attitude angle deviation on the system positioning accuracy is studied. The simulation...
A proof-of-principle demonstrator based on ultra-sonic technology capable of identifying the beacon node within 450 μs is discussed. Time difference of arrival is measured by means of a microcontroller-based board Nucleo STM32 L152RE combined with a custom receiving circuit. The position is computed using a personal computer after the demonstrator acquisition. The demonstrator is validated by static...
In this contribution, an opto-acoustic system for distance measurement between a transmitter and a receiver is presented. This distance measurement is part of an indoor localization system which uses multilateration to obtain the position and orientation of rigid bodies. The novelty of the presented distance measurement is the efficiency in the sense that high accuracy is obtained with the use of...
Node mobility, as one of the most important features of Wireless Sensor Networks (WSNs), may affect the reliability of communication links in the networks, leading to abnormalities and decreasing the quality of service provided by WSNs. The mCWQ calculus (i.e., CWQ calculus with mobility) is recently proposed to capture the feature of node mobility and increase the communication quality of WSNs. In...
GNSS timing is currently used worldwide in critical real-time systems that require precise synchronization or time-stamping at geographically dispersed sites, such as wireless telecom stations, electrical power grids, and financial services. For applications where multiple equipment needs to be deployed, it is desirable to use low-cost, single-frequency receivers. Increasing demands in cost-saving...
Received signal strength indicator (RSSI) are mostly used to measure distance in wireless sensor networks (WSNs). It is difficult to avoid the error of RSSI ranging due to the complexity of the indoor environment. However, the localization error of the existing localization algorithm will increase greatly with the increase of ranging error. In order to improve the positioning accuracy, stability as...
A novel method for distance estimation is introduced, based on an OFDM signal combined with the Zadoff-Chu Sequences. By exploiting the properties of these sequences it is possible to evaluate the distance between a transmitter and a receiver with a very good precision and accuracy. The technique effectiveness is demonstrated in a real operating environment by measuring the distance between two active...
Pulsars emit broadband electromagnetic radiation, with an individual signature (period and shape), ranging from radio to X-ray and gamma-ray frequencies. For the purpose of navigation the pulsars of interest are fast rotating neutron stars that emit short stable periodic pulses, having periods between milliseconds and seconds. By detecting a set of known pulsars, it is possible to use them as beacons...
In this paper, we propose a novel energy detection (ED) receiver architecture combined with time-of-arrival (TOA) estimation algorithm, compliant to the IEEE 802.15.4a standard. The architecture is based on double overlapping integrators and a sliding correlator. It exploits a series of ternary preamble sequences with perfect autocorrelation property. This property ensures coding gain which allows...
Accurate ranging or localization in non-line of sight conditions is still an open research problem. Non-line of sight conditions usually introduce a positive bias in the ranging measurement that has to be corrected before accurate localization can be achieved. In order to correct this bias, the non-line of sight channel (or path) has to be characterized and known a priori. In this paper, we characterize...
In recent years, research into localization systems has become more popular as the proliferation of Wireless Sensor Networks (WSNs) grows. Wireless Localization can refer to either an “Active” system which tracks a mobile transceiver, or “Passive” localization which tracks a transceiver free entity by measuring the changes it makes to the surrounding wireless environment. Recent work has seen both...
The high precision ranging using ultra wideband (UWB) requires mitigation of interference from other communication systems, in particular from narrowband interference (NBI). There have been many studies of adaptive notch filters (ANF) to cope with NBI at various frequencies. This paper proposes a novel adaptive NBI mitigation method which uses the direction of arrival as well as frequency selectivity...
Severe performance degradation of Global Navigation Satellite Systems (GNSS) is produced in urban scenarios, mainly due to dense multipath and non-line-of-sight (NLoS) conditions. Thus, the integration of GNSS with additional positioning systems, such as the location methods in Long Term Evolution (LTE) cellular systems, may cope with these challenging scenarios. This work proposes a generic evaluation...
Vehicles in the near future will be equipped with dedicated short-range communications (DSRC) transceiver which holds great promise of significantly reducing vehicle collisions by enabling vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communications. In addition, modern vehicles will be equipped with different on-board sensors such as GPS receivers and ranging sensors (e.g., cameras,...
In this paper, a new approach using the ultrasonic transceiver for the distance measurement between more points with the possible data communication is described. In the beginning, the paper deals with the theoretical problem of the ultrasonic distance measurement and how the communication can be coded into the transmission. Then it proposes a working hardware prototype which is capable to communicate...
The paper introduces a novel method for distance estimation based on an OFDM signal combined with the Zadoff-Chu sequences. By exploiting the properties of these sequences, it is possible to evaluate the distance between two active nodes with a very good precision and accuracy. The technique effectiveness is demonstrated by measuring the distance between a single transmitter and a synchronized receiver...
The aim of this paper is to model the radio channel behavior in indoor environment for a transport application, and evaluate its impact on a ranging system by means of error estimation. The simulations were then performed in a tunnel scenario at 10 GHz, and the ray tracing model was adopted to obtain the channel response. In the positioning systems based on Time Of Arrival technique, the accuracy...
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