Title :
Adaptive ZCDPLL for QPSK detection
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Sharjah, Sharjah
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;
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
DOI :
10.1109/ICECS.2005.4633416
