Title :
An Analog Approach to Suppressing In-Band Narrow-Band Interference in UWB Receivers
Author :
Timothy Wayne Fischer;Burak Kelleci;Kai Shi;Aydn lker Karsilayan;Erchin Serpedin
Author_Institution :
Dept. of Electr. & Comput. Eng., Texas A&M Univ., College Station, TX
Abstract :
Due to the huge bandwidth of ultra-wide-band (UWB) systems, in-band narrow-band interference (NBI) may hinder receiver performance. Sources of potential NBI that lie within the IEEE 802.15.3a UWB bandwidth are presented. To combat interference in multi-band orthogonal frequency-division multiplexing (MB-OFDM) UWB systems, an analog notch filter is designed to be included in the UWB receive chain. The filter´s architecture is based on feedforward subtraction of the interference, and includes a least-mean-square (LMS) tuning scheme to match amplitudes of the two paths. An 8-bit discrete control is used to adjust the filter´s center frequency across the UWB baseband. It was fabricated in TSMC´s 0.18-mum process, and experimental results are provided
Keywords :
"Narrowband","Interference suppression","Filters","Bandwidth","Ultra wideband technology","Frequency division multiplexing","Least squares approximation","FCC","Electromagnetic compatibility","Local area networks"
Journal_Title :
IEEE Transactions on Circuits and Systems I: Regular Papers
DOI :
10.1109/TCSI.2007.895518
