System and method for adaptive radio frequency filtering
AssigneeNXP B.V.
InventorsYann Le Guillou, Frederic Pirot, Sebastien Amiot
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Abstract
A system and method provide adaptive filtering of radio frequency (RF) signals. Multiple signals are received in a predetermined RF spectrum, the signals including a desired signal and multiple potentially interfering signals. A first signal of the potentially interfering signals is down-converted to a baseband signal, and a power of the baseband signal is determined. When the power exceeds a predetermined threshold power, a first notch filter, corresponding to a frequency of the first signal, is activated.
Claims20
An adaptive filtering method, comprising:
- receiving a plurality of signals in a predetermined radio frequency (RF) spectrum, the plurality of signals including a desired signal and a plurality of potentially interfering signals;
- down-converting a first signal of the plurality of potentially interfering signals to a baseband signal;
- determining a power of the baseband signal;
- determining whether the power exceeds a threshold power;
- and
- when the power exceeds the threshold power, activating a first notch filter corresponding to a frequency of the first signal.
A system for adaptively filtering signals in a predetermined spectrum of a radio frequency (RF) receiver, the predetermined spectrum including a desired signal, the system comprising:
- a plurality of selectively activated notch filters configured to filter a corresponding plurality of frequencies of potentially interfering signals in the predetermined spectrum;
- a power detector configured to detect an aggregate power of received signals in the predetermined spectrum and to determine whether the aggregate power exceeds a predetermined maximum power;
- a local oscillator (LO) generator configured to generate a plurality of LO frequencies corresponding to the plurality of frequencies of the notch filters, the LO generator generating a first LO frequency corresponding to a first notch filter of the plurality of notch filters when the aggregate power exceeds the predetermined maximum power;
- a mixer configured to mix the received signals with the first LO frequency to down-convert the received signals to a baseband frequency;
- and
- a processor configured to determine whether a power of the baseband signal exceeds a threshold power and, when the power exceeds the threshold power, to activate the first notch filter.
A system for adaptively filtering signals in a predetermined spectrum of a radio frequency (RF) receiver, the predetermined spectrum comprising a desired signal, the system comprising:
- a plurality of selectively activated notch filters configured to filter a corresponding plurality of frequencies of potentially interfering signals in the predetermined spectrum;
- a power detector configured to detect an aggregate power of received signals in the predetermined spectrum and to determine whether the aggregate power exceeds a predetermined maximum power;
- a data path configured to demodulate the desired signal regardless of the aggregate power;
- a filter adaptation path configured to demodulate at least one of the plurality of potentially interfering signals to a baseband signal substantially simultaneously with the data path demodulating the desired signal when the aggregate power exceeds the predetermined maximum power;
- and
- a processor configured to determine whether a power of the baseband signal exceeds a threshold power and, when the power exceeds the threshold power, to selectively activate a first notch filter of the plurality of notch filters corresponding to the demodulated potentially interfering signal.
Dependencies are inferred from the claim text.