Patent ID: 8265211
Filing Date: 2012-09-11
Classification: H04B

Abstract:
1. A method of improving the carrier-to-noise ratio of a signal to be demodulated which is modulated at an intermediate frequency and diversity received from at least two synchronized receive subsystems of a digital receiver, the method comprising steps of: Extracting a signal B representing the noise component of the received signals from the two receive subsystems by cancelling the useful component of the signal to be demodulated; forming a feedback loop at the intermediate frequency to optimize the cancellation of the useful component of the modulated signal; adding the signal B representing the noise component in phase to one of the two received signals to be demodulated and in phase opposition to the other of the two received signals to be demodulated to minimize correlated noise contributions; and applying the resulting signals to corresponding demodulators of the synchronized receive subsystems.