Distortion reduction in a wireless communication device
AssigneeQUALCOMM Incorporated
InventorPeter Jivan Shah
Life of this patent
Estimating the term…
Abstract
The present invention provides a technique for cancellation of jammer signals in a radio frequency receiver. A radio frequency signal contains both a desirable signal and an undesirable jammer signal. The combined signal is processed with a filter (104) to extract only the undesirable jammer signal. The jammer signal is then added (104) back to the combined signal to effectively cancel the jammer signal. The system may be implemented using a feedforward approach or a feedback approach. The resultant clean signal is processed in a conventional manner.
Claims28
A system for the reduction of distortion in a wireless communication circuit having a combined signal including a desired signal and a jammer signal, comprising:
- a filter to remove the desired signal and thereby provide a filtered signal representative of the jammer signal;
- and
- an adder circuit receiving the combined signal and the filtered signal to thereby remove the jammer signal therefrom.
A circuit for the reduction of distortion in a communication circuit having a combined signal including a desired signal and a jammer signal, comprising:
- means for filtering the combined signal to remove the desired signal and thereby provide a filtered signal representative of the jammer signal;
- and
- means for adding the combined signal and the filtered signal to remove the jammer signal therefrom.
A circuit for the reduction of distortion in a receiver configured to receive a radio frequency (RF) signal at a selected RF, the received RF signal being a combined signal containing the desired signal and the jammer signal and a down-converter configured to convert the received RF signal to a selected lower frequency, the circuit further comprising:
- means for filtering the combined signal at the selected lower frequency to remove the desired signal;
- means for converting the filtered signal to the selected RF;
- and
- means for adding the received RF signal and the filtered RF signal to remove the jammer signal.
A method for the reduction of distortion in a wireless communication circuit having a combined signal including a desired signal and a jammer signal, the method characterized by:
- filtering the combined signal to remove the desired signal and thereby provide a filtered signal representative of the jammer signal;
- and
- adding the combined signal and the filtered signal to remove the jammer signal therefrom.
Dependencies are inferred from the claim text.