Title :
Adaptive digital compensation in DSP based FM modulators
Author :
Lim, A.G. ; Wang, G. ; Sreeram, V.
Author_Institution :
Dept. of Electr. & Electron. Eng., Western Australia Univ., Nedlands, WA, Australia
Abstract :
This paper discusses digital compensation for frequency dependent transfer characteristics and errors in digital PAM/CPFSK (Pulse Amplitude Modulation/Continuous Phase Frequency Shift Keying) quadrature modulators. A digital compensation method is proposed here using two adaptive FIR (Finite Impulse Response) filters to compensate for the magnitude and phase characteristics of the reconstruction filters in the quadrature modulator. The simulation results show that this technique is simple, efficient, and leads to substantial improvement of signal quality.
Keywords :
FIR filters; adaptive filters; digital filters; digital signal processing chips; error compensation; frequency shift keying; least mean squares methods; modulators; pulse amplitude modulation; DSP based FM modulators; adaptive FIR filters; adaptive digital compensation; continuous phase FSK; continuous phase frequency shift keying; frequency dependent transfer characteristics; frequency digital PAM/CPFSK quadrature modulators; magnitude characteristics; phase characteristics; pulse amplitude modulation; reconstruction filters; Adaptive filters; Amplitude modulation; Digital filters; Digital modulation; Digital signal processing; Finite impulse response filter; Frequency dependence; Frequency modulation; Frequency shift keying; Pulse modulation;
Conference_Titel :
Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on
Print_ISBN :
0-7803-7761-3
DOI :
10.1109/ISCAS.2003.1205974
