Patent ID: 6545532
Filing Date: 2003-04-08
Classification: H04L

Abstract:
A quadrature amplitude modulation (QAM) type demodulator comprising:an analog-to-digital converter receiving an input signal and producing a first signal, a baseband conversion circuit being electrically coupled to the analog-to-digital converter and receiving the first signal and producing a baseband signal, a timing recovery circuit being electrically coupled to the baseband conversion circuit and receiving the baseband signal, the timing recovery circuit including an interpolation filter for resampling the input signal, the interpolation filter carrying out an interpolation function that is independent of a symbol rate of the baseband signal and producing a timing recovery output signal, a carrier recovery circuit being electrically coupled to the timing recovery circuit and receiving the timing recovery output signal and producing a QAM signal, and a symbol detection circuit being electrically coupled to the carrier recovery circuit and receiving the QAM signal, whereby an output signal of the symbol detection circuit is a demodulated data output signal.