Patent ID: 7095802
Filing Date: 2006-08-22
Classification: H03J

Abstract:
1. An apparatus for digitally compensating received radio frequency signals, comprising: a first oscillator; a downconverter for receiving the received radio frequency signals, the downconverter being driven by the first oscillator and having a mixer; a first frequency monitor adapted to measure the frequency of the first oscillator; a second oscillator; an analog-to-digital converter driven by the second oscillator; a digital receiver driven by the second oscillator, the digital receiver having a numerically controlled oscillator; a second frequency monitor adapted to measure the frequency of the second oscillator; a digital demodulator; and a computer adapted to receive the frequency measurement of the first oscillator from the first frequency monitor, to receive the frequency measurement of the second oscillator from the second frequency monitor, to calculate the errors of the first oscillator and the second oscillator, and to calculate a numerically controlled oscillator setting based on the calculation of the errors of the first oscillator and the second oscillator; wherein the numerically controlled oscillator is adapted to receive the numerically controlled oscillator setting from the computer to cause the digital receiver to transmit a signal of a desired frequency to the digital demodulator.