Ingress suppression for communication systems
First Claim
1. A method for use in a receiver of a communication system for suppressing one or more narrow band interferences present in a communication channel, the method comprising:
- receiving at the receiver a communication signal from the communication channel;
filtering in the communication signal each narrow band interference to be suppressed in turn with a respective one of a plurality of Infinite Impulse Response (IIR) notch filters configured to suppress a respective one of the narrow band interferences;
providing a Decision Feedback Equalizer (DFE) to provide compensation for distortions introduced by the plurality of IIR notch filters, wherein equalization of the communication channel is isolated or decoupled from the suppression of the narrow band interferences; and
providing for each of the plurality of IIR notch filters prior to said DFE a respective one of a plurality of IIR all-pass filters devised to compensate for distortions introduced by a respective notch filter, to minimize the distortions introduced by each of the plurality of IIR notch filters to the communication signal prior to said DFE.
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Accused Products
Abstract
A method used in the receiver of a communication system is provided to suppress narrow band interferences, known as ingress, that are present in the communication channel, which is shared by a plurality of transmitters each having a channel pre-equalizer, by means of a Time Division Multiple Access (TDMA) scheme or Synchronous Code Division Multiple Access (SCDMA) scheme. The method comprises filtering the interferences using Infinite Impulse Response (IIR) notch filters, and providing IIR all-pass filters devised to compensate for substantially all phase distortions introduced by the notch filters. The method also includes an algorithm to detect the narrow band interferences and an adaptive equalizer to equalize the channel by computing the coefficients of the transmitters'"'"' pre-equalizers, and arranged such that the equalization of the channel is isolated from the suppression of the interferences.
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Citations
18 Claims
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1. A method for use in a receiver of a communication system for suppressing one or more narrow band interferences present in a communication channel, the method comprising:
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receiving at the receiver a communication signal from the communication channel; filtering in the communication signal each narrow band interference to be suppressed in turn with a respective one of a plurality of Infinite Impulse Response (IIR) notch filters configured to suppress a respective one of the narrow band interferences; providing a Decision Feedback Equalizer (DFE) to provide compensation for distortions introduced by the plurality of IIR notch filters, wherein equalization of the communication channel is isolated or decoupled from the suppression of the narrow band interferences; and providing for each of the plurality of IIR notch filters prior to said DFE a respective one of a plurality of IIR all-pass filters devised to compensate for distortions introduced by a respective notch filter, to minimize the distortions introduced by each of the plurality of IIR notch filters to the communication signal prior to said DFE. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for use in a receiver of a communication system for suppressing one or more narrow band interferences present in a communication channel, the method comprising:
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receiving at the receiver a communication signal from the communication channel; filtering in the communication signal each narrow band interference to be suppressed in turn with a respective one of a plurality of Infinite Impulse Response (IIR) notch filters configured to suppress a respective one of the narrow band interferences; and providing for each of the plurality of IIR notch filters a respective one of a plurality of IIR all-pass filters devised to compensate for phase distortions introduced by a respective IIR notch filter; wherein an equalization of the communication channel is isolated or decoupled from the suppression of the respective one of the narrow band interferences by using an adaptive equalizer in the receiver wherein during a training mode, a desired response of the adaptive equalizer is a replica of the communication signal if only distorted by the plurality of IIR notch filters and the plurality of IIR all-pass filters. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method for use in a receiver of a communication system for suppressing one or more narrow band interferences present in a communication channel, the method comprising:
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receiving at the receiver a communication signal from the communication channel; filtering in the communication signal each narrow band interference to be suppressed in turn with a respective one of a plurality of Infinite Impulse Response (IIR) notch filters configured to suppress a respective one of the narrow band interferences; providing a Decision Feedback Equalizer (DFE) to provide compensation for distortions introduced by the plurality of IIR notch filters, wherein a training sequence is used for equalizing the communication channel; and providing for each of the plurality of IIR notch filters prior to said DFE a respective one of a plurality of IIR all-pass filters devised to compensate for distortions introduced by a respective notch filter, to minimize the distortions introduced by each of the plurality of IIR notch filters to the communication signal prior to said DFE. - View Dependent Claims (15, 16, 17, 18)
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Specification