METHOD AND APPARATUS FOR PROCESSING SIGNAL
First Claim
1. A signal processing method for a receiver comprising:
- receiving an input signal within a first frequency range, the input signal including a desired signal and an interference signal;
down-converting the input signal to a second frequency range using an offset local oscillator signal having a frequency substantially equal to a central frequency of the desired signal, wherein the second frequency range is lower than the first frequency range;
separating the interference signal from the down-converted input signal;
up-converting the separated interference signal to the first frequency range;
subtracting the up-converted interference signal from the input signal at the first frequency range to obtain an interference removed signal; and
down-converting the interference removed signal to a third frequency range for demodulating using a local oscillator signal, wherein the third frequency range is lower than the first frequency range and the frequency of the offset local oscillator signal is different from a frequency of the local oscillator signal.
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Accused Products
Abstract
A signal processing method and system are provided. The method includes receiving an input signal within a first frequency range, the input signal including a desired signal and an interference signal. The method includes down-converting the input signal to a second frequency range, which is lower than the first frequency range, using an offset local oscillator signal having a frequency substantially equal to the central frequency of the desired signal. The method includes separating the interference signal from the down-converted input signal. The method includes up-converting the separated interference signal to the first frequency range. The method includes subtracting the up-converted interference signal from the input signal at the first frequency range to obtain an interference removed signal. The method includes down-converting the interference removed signal to a third frequency range, which is lower than the first frequency range, using a local oscillator signal, for demodulating. The frequency of the offset local oscillator signal is different from the frequency of the local oscillator signal.
8 Citations
20 Claims
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1. A signal processing method for a receiver comprising:
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receiving an input signal within a first frequency range, the input signal including a desired signal and an interference signal; down-converting the input signal to a second frequency range using an offset local oscillator signal having a frequency substantially equal to a central frequency of the desired signal, wherein the second frequency range is lower than the first frequency range; separating the interference signal from the down-converted input signal; up-converting the separated interference signal to the first frequency range; subtracting the up-converted interference signal from the input signal at the first frequency range to obtain an interference removed signal; and down-converting the interference removed signal to a third frequency range for demodulating using a local oscillator signal, wherein the third frequency range is lower than the first frequency range and the frequency of the offset local oscillator signal is different from a frequency of the local oscillator signal. - View Dependent Claims (2, 3, 4, 5)
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6. A signal processing method comprising:
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receiving an input signal within a first frequency range, the input signal including a desired signal and an interference signal; down-converting the input signal to a second frequency range using a zero IF method, wherein the second frequency range is lower than the first frequency range; separating the interference signal from the down-converted input signal; up-converting the separated interference signal to the first frequency range; subtracting the up-converted interference signal from the input signal at the first frequency range to obtain an interference removed signal; and down-converting the interference removed signal to a third frequency range for demodulating using a non-zero IF method, wherein the third frequency range is lower than the first frequency range. - View Dependent Claims (7, 8, 9, 10)
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11. A receiver comprising:
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a first mixing circuit for down-converting an input signal within a first frequency range to a second frequency range using a zero IF method, wherein the second frequency range is lower than the first frequency range, and the input signal includes a desired signal and an interference signal; a filter for separating the interference signal from the down-converted input signal; a second mixing circuit for up-converting the separated interference signal to the first frequency range; a subtracting circuit for subtracting the up-converted interference signal from the input signal at the first frequency range to obtain an interference removed signal; and a third mixing circuit for down-converting the interference removed signal to a third frequency range for demodulating using a non-zero IF method, wherein the third frequency range is lower than the first frequency range. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification