Patent ID: 6735262
Filing Date: 2004-05-11
Classification: H04L

Abstract:
An apparatus of decision-directed carrier recovery based on LMS method, comprising:frequency estimating means for compensating a carrier frequency offset of an external input signal and recovering a carrier frequency of the input signal; phase estimating means for compensating a phase offset of an output signal outputted from the frequency estimating means and estimating a carrier phase of the frequency offset compensated signal; and complex number deciding means for determining a complex number for an output signal outputted from the phase estimating means and providing the determined complex number to the frequency estimating means and the phase estimating means, wherein the frequency estimating means comprises: first conjugate complex number generating means for receiving the complex number from the complex number deciding means and generating a first conjugate complex number; first multiplying means for multiplying the external input signal by the first conjugate complex number; averaging means for averaging an output signal of the first multiplying means; second conjugate complex number generating means for receiving the output of the averaging means and generating a second conjugate complex number; and second multiplying means for multiplying the external input signal by the second conjugate complex number and generating the frequency offset compensated signal.