Device and method for improving the carrier-to-noise ratio for a receiver with diversity
AssigneeThomson Licensing
InventorsJean-Luc Robert, Jean-Yves Le Naour, Jean-Francois Pintos
Life of this patent
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Abstract
The method of improving the carrier-to-noise ratio for a receiver with diversity, and the associated device, consists, after extracting, by phase shifting, the noise component of the signals to be demodulated, in optimizing the cancellation of the useful component via a feedback loop acting on the phase shifter and in summing the noise component in phase and in phase opposition with these signals to improve the carrier-to-noise ratio.
Claims7
Method of improving the carrier-to-noise ratio of a signal to be demodulated from at least two receive subsystems of a digital receiver with diversity, wherein it comprises, for two synchronized receive subsystems, the following steps:
- extracting the B signal representing the noise component of the signals by cancelling the useful component of the signal to be demodulated;
- forming a feedback loop to optimize the cancellation of the useful component;
- adding the signal B representing the noise component in phase to one of the two signals to be demodulated and in phase opposition to the other of the two signals to be demodulated.
Device for improving the carrier-to-noise ratio of a signal to be demodulated from at least two receive subsystems of a digital receiver with diversity, located downstream of a tuner element and upstream of a demodulator, wherein, for two receive subsystems including synchronized tuner elements, it comprises:
- Means for extracting the signal B representing the noise component of the signals from two receive subsystems;
- means forming a feedback loop in order to optimize the cancellation of the useful component;
- means of summing, in phase, this signal B representing the noise component with one of the two signals to be demodulated and, in phase opposition, this signal with the other of the two signals to be demodulated to minimize the correlated noise contributions on each channel.
Dependencies are inferred from the claim text.