tailieunhanh - Báo cáo hóa học: " A New Position Location System Using DTV Transmitter Identification Watermark Signals"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: A New Position Location System Using DTV Transmitter Identification Watermark Signals | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article ID42737 Pages 1-11 DOI ASP 2006 42737 A New Position Location System Using DTV Transmitter Identification Watermark Signals Xianbin Wang 1 YiyanWu 1 and Jean-Yves Chouinard2 1 Communications Research Centre Canada 3701 Carling Avenue Ottawa Canada ON K2H 8S2 2 Department of Electrical and Computer Engineering Laval University Canada QCG1K 7P4 Received 30 May 2005 Revised 30 January 2006 Accepted 9 March 2006 A new position location technique using the transmitter identification TxID RF watermark in the digital TV DTV signals is proposed in this paper. Conventional global positioning system GPS usually does not work well inside buildings due to the high frequency and weak field strength of the signal. In contrast to the GPS the DTV signals are received from transmitters at relatively short distance while the broadcast transmitters operate at levels up to the megawatts effective radiated power ERP . Also the RF frequency of the DTV signal is much lower than the GPS which makes it easier for the signal to penetrate buildings and other objects. The proposed position location system based on DTV TxID signal is presented in this paper. Practical receiver implementation issues including nonideal correlation and synchronization are analyzed and discussed. Performance of the proposed technique is evaluated through Monte Carlo simulations and compared with other existing position location systems. Possible ways to improve the accuracy of the new position location system is discussed. Copyright 2006 Xianbin Wang et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Geographic location information can be retrieved by various infrastructures and technologies. The most popular position location .