Adaptive ZCDPLL for QPSK detection

Author

Nasir, Qassim

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Sharjah, Sharjah

fYear

2005

fDate

11-14 Dec. 2005

Firstpage

1

Lastpage

3

Abstract

A Second Order Zero Crossing Digital Phase Locked LOOP (ZCDPLL) with time varying loop gains is applied to QPSK detection. The ZCDPLL consists of an adaptive Kalman estimator which estimates the phase offsets of a received data bearing passband signal. The ZCDPLL digital filter gains are updated using the Recursive Least Squares (RLS) algorithm. The performance of the use of adaptive ZCDPLL for QPSK detection is evaluated and compared with fixed gains case. Simulation results for the variable gain ZCDPLL compared to a fixed gains show the improved the probability of error performance.

Keywords

Kalman filters; adaptive filters; digital filters; digital phase locked loops; least squares approximations; quadrature phase shift keying; signal sampling; QPSK detection; adaptive Kalman estimator; adaptive ZCDPLL; digital filter; error probability; phase offsets estimator; recursive least squares algorithm; second order zero crossing digital phase locked loop; time varying loop; Digital filters; Kalman filters; Least squares methods; Passband; Performance gain; Phase detection; Phase estimation; Phase locked loops; Quadrature phase shift keying; Resonance light scattering; adaptive digital phase locked loops; digital phase locked loops; non-uniform sampling;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits and Systems, 2005. ICECS 2005. 12th IEEE International Conference on

Conference_Location

Gammarth

Print_ISBN

978-9972-61-100-1

Electronic_ISBN

978-9972-61-100-1

Type

conf

DOI

10.1109/ICECS.2005.4633416

Filename

4633416