Title :
Adaptive ZCDPLL for Quadrature-Quadrature PSK Carrier Recovery
Author_Institution :
Dept. of Electr. & Comput. Eng., Sharjah Univ., Shariah
Abstract :
A second order zero crossing digital phase locked loop (ZCDPLL) with time varying loop gains is applied to Quadrature-Quadrature phase shift keying Q2PSK modem for carrier recovery. 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 Q2 PSK modem for carrier recovery 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 :
adaptive Kalman filters; digital phase locked loops; least squares approximations; modems; phase shift keying; PSK carrier recovery; ZCDPLL; adaptive Kalman estimator; adaptive digital phase locked loops; phase shift keying; recursive least squares; zero crossing digital phase locked loop; Digital filters; Kalman filters; Least squares methods; Modems; Passband; Performance gain; Phase estimation; Phase locked loops; Phase shift keying; Resonance light scattering; adaptive digital phase locked loops; digital phase locked loops; non-uniform sampling;
Conference_Titel :
Circuits and Systems, 2006. APCCAS 2006. IEEE Asia Pacific Conference on
Conference_Location :
Singapore
Print_ISBN :
1-4244-0387-1
DOI :
10.1109/APCCAS.2006.342512
