Title :
Performance of a quadricorrelator driven by modulated signals
Author :
D´Andrea, Aldo N. ; Mengali, U.
Author_Institution :
Istituto di Elettronica e Telecomunicazioni, Pisa Univ., Italy
fDate :
11/1/1990 12:00:00 AM
Abstract :
An analysis is presented of a balanced quadricorrelator driven by a digital-modulated signal with thermal noise. The aim is to assess its performance as a frequency difference detector. The circuit output is decomposed into a signal term and a disturbance referred to as noise. Exprssions are given for the signal and for the power spectral density of the noise as a function of the various system parameters. Design criteria are provided to minimize the output noise for zero frequency offset. In particular, it is found that at high signal-to-noise ratios the noise level can be made vanishingly small by the proper choice of the quadricorrelator filters. A similar result has been recently discovered for another frequency difference detector, the dual-filter detector. It is shown that a balanced quadricorrelator and a dual-filter detector can be made totally equivalent
Keywords :
correlators; filtering and prediction theory; signal detection; balanced quadricorrelator; circuit output; design criteria; digital-modulated signal; dual-filter detector; frequency difference detector; performance; power spectral density; thermal noise; Band pass filters; Circuit noise; Digital modulation; Low pass filters; Noise level; Phase detection; Phase frequency detector; Signal analysis; Voltage; Voltage-controlled oscillators;
Journal_Title :
Communications, IEEE Transactions on