Frequency domain DOA estimation for positioning in impulse radio ultra-widband systems

The emergence of smart antenna technology gave the advantage to reduce interference inherent in dense multipath propagation channels to improve coverage and increase system capacity, so, various localization systems have been proposed based on the Impulse Radio Ultra Wide band (IR-UWB) signals using direction of arrival estimation. In order to ensure high precision in indoor environment, DOA estimation techniques have been developed. In this paper, performance of many high resolution methods for Impulse Radio Ultra Wide band (IR-UWB) systems in frequency domain such as ROOT-MUSIC, estimation of signal parameters via rotational invariance technique (ESPRIT) and Matrix PENCIL are evaluated, as well as these techniques are compared also with the performance corresponding to the Cramer- Rae lower bound (CRB). Synthesis results and relevant performance comparisons are presented.