Method and apparatus for impulse noise detection and suppression for DVB-T
AssigneeBroadcom Corporation
InventorsWensheng V. Liu, Devan Namboodiri
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Abstract
A method and apparatus for adaptive impulse noise detection and suppression (INDS) where information regarding detected impulse noise (IN) pulses is used to adjust detection and suppression parameters. To decrease the rate of false detection, groups of samples, instead of individual samples, of the digitized received signal are used to detect the presence of IN pulses. The method and apparatus for adaptive INDS may be used in communication systems employing single-carrier or multi-carrier modulation schemes, and is preferably used for Orthogonal Frequency Division Multiplexing (OFDM) modulation. The proposed adaptive INDS systems may be used to effectively reduce the effects of impulse noise and improve the quality of received signals.
Claims32
A method for impulse noise (IN) detection and suppression in a received signal comprising:
- comparing a power level of each sample within a group of samples in a received signal to a power threshold;
- determining the presence of an IN pulse in the group of samples by detecting at least one sample having a power level which exceeds a power threshold;
- and
- suppressing a power level for each sample in the group of samples by multiplying the magnitude of the sample by a clipping factor.
A receiver comprising:
- an impulse noise (IN) detector configured to:
- compare a power level of each sample within a group of samples to a power threshold;
- determine the presence of an IN pulse in the group of samples by detecting at least one sample having a power level which exceeds a power threshold;
- and
- an IN suppressor configured to suppress a power level for each sample in the group of samples by multiplying the magnitude of the sample by a clipping factor.
A computer-readable storage medium containing a first set of instructions adapted to create a processor, wherein the processor is configured to implement a second set of instructions, the second set of instructions comprising:
- a comparing code segment for comparing a power level of each sample from a received signal to a power threshold;
- a detecting code segment for detecting an IN pulse in the samples, if any, by determining a group of samples in which at least one sample exceeds the power threshold;
- and
- an adjusting code segment for adjusting a power level for each sample in the determined group of samples by multiplying by a clipping factor.
A computer-readable storage medium containing a set of instructions, the set of instructions comprising:
- a comparing code segment for comparing a power level of each sample from a portion of a received signal to a power threshold;
- a detecting code segment for detecting an IN pulse in the samples, if any, by determining a group of samples in which at least one sample exceeds the power threshold;
- and
- an adjusting code segment for adjusting a power level for each sample in the determined group of samples by multiplying by a clipping factor.
A method for impulse noise (IN) detection and suppression in a received signal comprising:
- comparing a power level of each sample within a group of samples in an OFDM received signal to a power threshold;
- determining the presence of an IN pulse in the group of samples in the OFDM signal by detecting at least one sample having a power level which exceeds a power threshold;
- and
- suppressing a power level for each sample in the group of samples by multiplying the magnitude of the sample by a clipping factor.
A receiver comprising:
- an impulse noise (IN) detector configured to:
- compare a power level of each sample within a group of samples in an OFDM signal to a power threshold;
- determine the presence of an IN pulse in the group of samples in the OFDM signal by detecting at least one sample having a power level which exceeds a power threshold;
- and
- an IN suppressor configured to suppress a power level for each sample in the group of samples in the OFDM signal by multiplying the magnitude of the sample by a clipping factor.
A computer-readable storage medium containing a first set of instructions adapted to create a processor, wherein the processor is configured to implement a second set of instructions, the second set of instructions comprising:
- a comparing code segment for comparing a power level of each sample from a received OFDM signal to a power threshold;
- a detecting code segment for detecting an IN pulse in the samples, if any, by determining a group of samples in the OFDM signal in which at least one sample exceeds the power threshold;
- and
- an adjusting code segment for adjusting a power level for each sample in the determined group of samples in the OFDM signal by multiplying by a clipping factor.
A computer-readable storage medium containing a set of instructions, the set of instructions comprising:
- a comparing code segment for comparing a power level of each sample from a portion of a received OFDM signal to a power threshold;
- a detecting code segment for detecting an IN pulse in the samples, if any, by determining a group of samples in which at least one sample exceeds the power threshold;
- and
- an adjusting code segment for adjusting a power level for each sample in the determined group of samples by multiplying by a clipping factor.
Dependencies are inferred from the claim text.