When more than two microphones are used, the traditional time-delay-of-arrival (TDOA) based sound source localization (SSL) approach involves two steps. The first step computes TDOA for each microphone pair, and the second step combines these estimates. This two-step process discards relevant information in the first step, thus degrading the SSL accuracy and robustness. Although less used, one-...

This paper covers location determination in wireless cellular networks based on time difference of arrival (TDoA) measurements in a factor graphs framework. The resulting nonlinear estimation problem of the localization process for the mobile station cannot be solved analytically. The well-known iterative Gauss-Newton method as standard solution fails to converge for certain geometric constella...

In this paper, we propose an efficient hybrid location algorithm with BP neural networks. We choose two-layer backpropagation network for data fusions and position estimation to improve hybrid location accuracy and efficiency with TOA/TDOA/AOA parameters in mobile communication networks. So the position estimation can be optimized by network parallel processing robustly, and the inaccuracy or f...

Recently, mobile location estimate problem is a significant issue in many industrial fields such as radar, wireless communication, target tracking, and various types of location based services. Time difference of arrival (TDOA) and angle of arrival (AOA) are typical geolocation techniques for estimation of mobile location. In this paper, we suggest a hybrid TDOA/AOA geolocation equation as a si...

In low-power and high-density real time locating systems, time difference of arrival (TDOA) technique outperforms other ranging techniques. The realization of TDOA-based high resolution indoor localization directly depends on the performance of clock synchronization. In this paper, we introduce a clock synchronization method based on the Kalman filter. The updated clock skew from the Kalman fil...

Time based TDOA localization systems require time or clock synchronization between receivers such as cellular base stations, satellites, and sensor nodes. Imperfection of time synchronization causes degradation in positioning accuracy. However if we know about its characteristics and how to estimate the clock offsets, the localization system can be properly calibrated to provide good quality of...

In this paper, we present measurement results of the experimental validation of the UWB localization platform under Line-Of-Sight (LOS) and Non-Line-Of-Sight (NLOS) conditions. The platform is based on the Time Difference of Arrival (TDoA) technique and the energy detection receiver. TDoA based localization systems require minimum four anchors to provide 3D position data. In order to deal with ...

For the IPSN 2016 Microsoft indoor localization competition, we propose a system based on uplink TDoA using commerically available hardware from Nanotron and a proprietary multilateration algorithm.

Many researchers have investigated multi-channel speech enhancement techniques which can be used for the pre-processing of the speech recognition system. Numerous microphones can give high performance, but they require additional hardware costs and generate the design problem about microphone position. Therefore speech enhancement technique using two microphones is preferred in mobile phone suc...