Title :
Localization via ultra-wideband radios: a look at positioning aspects for future sensor networks
Author :
Gezici, Sinan ; Tian, Zhi ; Giannakis, Georgios B. ; Kobayashi, Hisashi ; Molisch, Andreas F. ; Poor, H. Vincent ; Sahinoglu, Zafer
Author_Institution :
Dept. of Electr. Eng., Princeton Univ., NJ, USA
fDate :
7/1/2005 12:00:00 AM
Abstract :
UWB technology provides an excellent means for wireless positioning due to its high resolution capability in the time domain. Its ability to resolve multipath components makes it possible to obtain accurate location estimates without the need for complex estimation algorithms. In this article, theoretical limits for TOA estimation and TOA-based location estimation for UWB systems have been considered. Due to the complexity of the optimal schemes, suboptimal but practical alternatives have been emphasized. Performance limits for hybrid TOA/SS and TDOA/SS schemes have also been considered. Although the fundamental mechanisms for localization, including AOA-, TOA-, TDOA-, and SS-based methods, apply to all radio air interface, some positioning techniques are favored by UWB-based systems using ultrawide bandwidths.
Keywords :
channel estimation; direction-of-arrival estimation; multipath channels; radiofrequency interference; signal resolution; time-domain analysis; time-of-arrival estimation; ultra wideband communication; wireless sensor networks; UWB technology; angle-of-arrival estimation; location estimation; multipath channel; multiple access interference; radio air interface; radio localization; signal resolution; time domain analysis; time-of-arrival estimation; ultrawideband radio; wireless positioning; wireless sensor network; Bandwidth; Context; FCC; Land mobile radio cellular systems; Radar applications; Sensor systems; Standardization; Ultra wideband communication; Ultra wideband radar; Ultra wideband technology;
Journal_Title :
Signal Processing Magazine, IEEE
DOI :
10.1109/MSP.2005.1458289