An adaptive notch-filter-based frequency-difference detector and its applications

Author

Kwan, Tom W. ; Martin, Kenneth

Author_Institution

Analog Devices, Santa Clara, CA, USA

Volume

43

Issue

11

fYear

1995

fDate

11/1/1995 12:00:00 AM

Firstpage

2784

Lastpage

2793

Abstract

A frequency-difference detector (FDD) based on an adaptive notch filter is proposed. Frequency detectors are useful in decreasing acquisition times in phase-locked-loop and Costas-loop-based clock and carrier-recovery systems. To avoid certain drawbacks associated with signal down-conversion to baseband, the input is initially processed in the bandpass domain. In applications where limits on acquisition time demand a wide closed-loop tracking bandwidth, the output of the proposed FDD has less inherent ripple and bias when compared with a quadricorrelator, a commonly used FDD. Two applications of the proposed FDD in the demodulation of BPSK data are presented

Keywords

adaptive filters; band-pass filters; digital filters; digital phase locked loops; notch filters; phase shift keying; synchronisation; tracking filters; BPSK data; Costas-loop-based systems; acquisition times; adaptive notch-filter-based frequency-difference detector; bandpass domain; bias; carrier-recovery systems; clock-recovery systems; demodulation; phase-locked-loop based systems; ripple; signal down-conversion; wide closed-loop tracking bandwidth; Adaptive filters; Band pass filters; Bandwidth; Baseband; Clocks; Demodulation; Phase detection; Phase frequency detector; Phase locked loops; Signal processing;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.481229

Filename

481229