IMPULSIVE NOISE SUPPRESSION SCHEME IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING
First Claim
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1. An impulsive noise suppression method in orthogonal frequency division multiplexing, comprising:
- transforming a received signal into a frequency domain;
equalizing an output of said transforming step based on an ideal channel estimation;
converting an output of said equalizing step to a preliminary signal estimation of a transmitted base-band symbol;
determining an estimation of total noise;
calculating a signal to noise ratio by dividing said preliminary signal estimation with said estimation of total noise; and
performing an impulse noise suppression step when said signal to noise ratio is lower than a threshold value.
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Abstract
This invention provides an impulsive noise suppression method in orthogonal frequency division multiplexing. The method comprises an equalization and de-mapping step for estimating a preliminary estimation of signal and a total noise estimation by utilizing ideal channel estimation, de-mapping, and pilot insertion technique on received signal; and a SNR comparison step for determining a SNR by dividing said preliminary estimation of signal and said total noise estimation and comparing said SNR with a threshold value.
15 Citations
12 Claims
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1. An impulsive noise suppression method in orthogonal frequency division multiplexing, comprising:
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transforming a received signal into a frequency domain; equalizing an output of said transforming step based on an ideal channel estimation; converting an output of said equalizing step to a preliminary signal estimation of a transmitted base-band symbol; determining an estimation of total noise; calculating a signal to noise ratio by dividing said preliminary signal estimation with said estimation of total noise; and performing an impulse noise suppression step when said signal to noise ratio is lower than a threshold value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An impulsive noise suppression method in orthogonal frequency division multiplexing, comprising:
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estimating a preliminary estimation and a total noise estimation by utilizing an ideal channel estimation and de-mapping and pilot insertion technique on the received signal; determining a signal to noise ratio by dividing said preliminary estimation by said total noise estimation; and performing an impulse noise suppression step when said signal to noise ratio is lesser than a threshold value. - View Dependent Claims (8, 9)
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10. An impulsive noise suppression system in orthogonal frequency division multiplexing, comprising:
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fast Fourier transform (FFT) means to transform a received signal; frequency domain equalization means to equalize an output of said FFT means base on an ideal channel estimation; de-mapping and pilot insertion means to convert an output of said equalization means into a preliminary signal estimation of transmitted base-band symbol; noise estimation means to determine an estimation of total noise by multiplying said ideal channel estimation to the difference between the output of said equalization means and said preliminary signal estimation; SNR (signal to noise ratio) comparison means to determine a SNR by dividing said preliminary signal estimation by said estimation of total noise and compares said SNR to a threshold value; and impulse noise suppression means to remove re-constructed impulse noise from said output of the equalization means when said SNR is lower than said threshold value. - View Dependent Claims (11, 12)
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Specification