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An Analog Approach to Suppressing In-Band Narrow-Band Interference in UWB Receivers

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5 Author(s)
Fischer, T.W. ; Dept. of Electr. & Comput. Eng., Texas A&M Univ., College Station, TX ; Kelleci, B. ; Kai Shi ; Karsilayan, A.I.
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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

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Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:54 ,  Issue: 5 )