This paper proposes a mobile user location scheme for wideband code-division multiple-access (CDMA) wireless communication systems. To achieve high location accuracy and low cost of the mobile receiver, the location scheme combines the time difference of arrival (TDOA) measurements from the forward link pilot signals with the angle of arrival (AOA) measurement from the reverse link pilot signal...

Direction of Arrival (DOA) estimation is an important technique for speech perception and speaker localization, which has received much attention in recent years. However, most conventional methods concentrate on noisy environments, which leads to serious degradation of their performance in the presence of reverberation. To resolve this phenomenon, a novel approach based on reverberation weight...

A microphone array can be used to locate a dominant acoustic source in a given environment. This capability is successfully employed to locate an active talker in teleconferencing or other multi-speaker applications. In this work the source location is obtained in two steps: 1) a Time Difference Of Arrival (TDOA) computation between the signals of the array; 2) an \optimal" source location base...

Despite extensive study on wireless sensor network security, defending internal attacks and finding abnormal behaviour of the sensor are still difficult and unsolved task. The conventional cryptographic technique does not give the robust security or detection process to save the network from internal attacker that cause by abnormal behavior. The insider attacker or abnormally behaved sensor ide...

This work proposes the use of a hybrid acoustic and optical indoor positioning system for the accurate 3D positioning of Unmanned Aerial Vehicles (UAVs). The acoustic module of this system is based on a Time-Code Division Multiple Access (T-CDMA) scheme, where the sequential emission of five spread spectrum ultrasonic codes is performed to compute the horizontal vehicle position following a 2D ...

This paper details a method of estimating the uncertainty of dimensional measurement for a three dimensional coordinate measurement machine. An experimental procedure was developed to compare three dimensional coordinate measurements with calibrated reference points. The reference standard used to calibrate these reference points was a fringe counting interferometer with a multilateration like ...

In this paper, we propose a novel ID-based secure distance bounding protocol. Unlike traditional secure distance measurement protocols, our protocol is based on standard insecure distance measurement as elemental building block, and enables the implementation of secure distance bounding using commercial off-the-shelf (COTS) ranging devices. We use the proposed protocol to implement secure radio...

In this paper we discuss the synthesis algorithm DATEMM, which finds consistent graphs in a TDOA based speaker localization scenario. We analyse it in terms of complexity and point out the shortcoming of this algorithm, that not all possible solutions are found. Then we present an improved algorithm to fix this problem. Finally we verify our analysis through simulations and give a comparison to...

We present a demonstration of a phone-to-phone Sword Fight! game. It utilizes our solution for achieving high speed 3D continuous localization described in the accompanying conference paper [1]. The approach uses acoustic cues based on time-difference of arrival and power level. It assumes at least two microphones and one speaker per phone, which is common on new smartphones. Accelerometers and...

This paper presents a simulation study of nonhybrid and hybrid localization techniques using RSSI, TOA, and TDOA location dependent parameters. Maximum likelihood and weighted least squares are considered and developed for both non-hybrid and hybrid cases. Monte-Carlo simulations using realistic radio parameters extracted from an ultra wide band measurement campaign are carried out in order to ...