In this paper, we propose a Bandwidth Efficient TDOA (Time difference of arrival) Computation using OFDM for Sensor Networks. Simulation results indicate the performance of the algorithm in terms of Signal-to-Noise (SNR) ratio and Bandwidth utilization considering Centralised and DeCentralised methods. | ISSN:2249-5789 CH Nagarjuna Reddy et al, International Journal of Computer Science & Communication Networks,Vol 1(1),September-October 2011 TDOA Computation Using Multicarrier Modulation for Sensor Networks Reddy1 Student, Department of ECE, Malnad College of Engineering, Hassan Karnataka, India. Associate Professor, Department of ECE, Malnad College of Engineering, Hassan, Karnataka, India. brshsn61@ ABSTRACT: Locating accurate positions of the nodes is normally required in Sensor Networks which are attempting to locate and track an emitter or sources of signals. GPS is normally used as it provides high accuracy position measurement, but it has its own limitations. In this paper, we propose a Bandwidth Efficient TDOA (Time difference of arrival) Computation using OFDM for Sensor Networks. Simulation results indicate the performance of the algorithm in terms of Signal-to-Noise (SNR) ratio and Bandwidth utilization considering Centralised and DeCentralised methods. Keywords: Orthogonal frequency division multiplexing, Time difference of arrival, sensor networks, GPS I. INTRODUCTION Accurate position measurement is important for many source localization and navigation problems. Wireless sensor networks require determining the position of the source in a wireless transmission. In the navigation problem, the premise is to use existing wireless infrastructure [15] such as radio and television towers at known locations, to determine the position of a mobile receiver. Although the global positioning system (GPS) usually provides worldwide high-accuracy position measurements, it requires lines of sight to multiple satellites. Hence, it is ill-suited for use in indoors, underground, or in urban canyons. Moreover, in the presence of radio frequency interference or jamming, GPS may be unavailable [14]. That’s why, alternative methods of navigation and positioning are of interest, either as .
