Method and apparatus for detection and cancellation of single-tone or multi-tone interference in communication systems
First Claim
1. A method for canceling an interference signal from a received signal, comprising:
- performing a time-frequency transform on the received signal;
computing an estimated frequency of the interference signal using a result of the time-frequency transform;
obtaining an estimated amplitude of the interference signal;
generating a reference signal using the estimated frequency and the estimated amplitude of the interference signal;
generating an error signal using the reference signal and the received signal based on minimum correlation criteria, wherein the error signal is defined as one of the following equations;
σ
(n)=(R(n)−
I′
(n))conj(I′
(n)) or σ
(n)=(R(n)−
I′
(n))conj(R(n)),wherein, R(n) represents the received signal, I′
(n) represents the reference signal, and n represents sampling times;
updating the reference signal using the error signal based on an adaptive algorithm to minimize a difference between the reference signal and the interference signal;
subtracting in time domain the reference signal from the received signal to produce a refined signal; and
outputting the refined signal.
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Abstract
A method and system for canceling an interference signal are provided. In the method, a received signal is transformed from a time domain to a frequency domain at relative low precision to obtain an estimated frequency and an estimated amplitude of the interference signal. A reference signal is generated using the estimated frequency and the estimated amplitude. An error signal is generated using the received signal and the reference signal based on minimum correlation criteria. The reference signal is adjusted using the error signal based on an adaptive algorithm. The reference signal is subtracted from the received signal to obtain the useful signal.
12 Citations
15 Claims
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1. A method for canceling an interference signal from a received signal, comprising:
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performing a time-frequency transform on the received signal; computing an estimated frequency of the interference signal using a result of the time-frequency transform; obtaining an estimated amplitude of the interference signal; generating a reference signal using the estimated frequency and the estimated amplitude of the interference signal; generating an error signal using the reference signal and the received signal based on minimum correlation criteria, wherein the error signal is defined as one of the following equations;
σ
(n)=(R(n)−
I′
(n))conj(I′
(n)) or σ
(n)=(R(n)−
I′
(n))conj(R(n)),wherein, R(n) represents the received signal, I′
(n) represents the reference signal, and n represents sampling times;updating the reference signal using the error signal based on an adaptive algorithm to minimize a difference between the reference signal and the interference signal; subtracting in time domain the reference signal from the received signal to produce a refined signal; and outputting the refined signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for canceling an interference signal from a received signal:
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an interference frequency detecting device to conduct a time-frequency transform on the received signal, and to estimate a frequency of the interference signal using the results of the time-frequency transform to obtain an estimated frequency of the interference signal; an estimated amplitude generating device to obtain an estimated amplitude of the interference signal; a phase part calculating device to calculate a phase part of a reference signal using the estimated frequency of the interference signal and a dynamic component of the phase part of the reference signal from an updating device; a multiply operation device to multiply an amplitude part and the phase part of the reference signal to generate the reference signal; an error signal generating device to generate an error signal using the received signal and the reference signal based on a minimum correlation criteria, wherein the error signal is defined as one of the following equations;
σ
(n)=(R(n)−
I′
(n))conj(I′
(n)), or σ
(n)=(R(n)−
I′
(n))conj(R(n)),wherein, R(n) represents the received signal, I′
(n) represents the reference signal, and n represents sampling times;the updating device to update the amplitude part and the phase part of the reference signal using the error signal based on an adaptive algorithm to make the reference signal approach the interference signal; and an add operation device to subtract in time domain the reference signal from the received signal to cancel the interference signal. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification