Title :
Joint NDA Estimation of Carrier Frequency/Phase and SNR for Linearly Modulated Signals
Author :
Gappmair, Wilfried ; López-Valcarce, Roberto ; Mosquera, Carlos
Author_Institution :
Inst. of Commun. Networks & Satellite Commun., Graz Univ. of Technol., Graz, Austria
fDate :
5/1/2010 12:00:00 AM
Abstract :
We consider the problem of joint non-data-aided (NDA) estimation of carrier frequency and phase offsets, together with that of signal and noise powers, obtained from the baud-rate samples of a linearly modulated signal distorted by Gaussian noise. The Crame??r-Rao lower bound (CRLB) is derived, for quadrature-symmetric constellations showing that the carrier parameters are decoupled from signal and noise powers. Furthermore, a joint NDA maximum-likelihood estimator is developed, based on the application of the expectation-maximization algorithm, which exhibits a jitter performance close to the CRLB for a wide SNR range.
Keywords :
Gaussian noise; expectation-maximisation algorithm; modulation; signal processing; Cramer-Rao lower bound; Gaussian noise; SNR; baud rate samples; carrier frequency; carrier phase; expectation-maximization algorithm; joint non-data-aided estimation; linearly modulated signals; maximum likelihood estimator; noise powers; phase offsets; quadrature symmetric constellations; Carrier offset estimation; Cramér–Rao lower bound; SNR estimation; expectation-maximization algorithm;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2010.2045545
