Spectrally constrained impulse shortening filter for a discrete multi-tone receiver
AssigneeTellabs Operations, Inc.
InventorsGopal Harikumar, Daniel Marchok
Life of this patent
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Abstract
A channel in a multiple carrier communication system is equalized by computing a target spectral response, shortening the impulse response of the channel so that a significant part of an energy of the impulse response is confined to a region that is shorter than a target length and filtering the signal based on the target spectral response.
Claims8
A method for selecting an impulse response for a spectrally constrained impulse shortening filter in a multiple carrier communication system, the method comprising:
- measuring received noise power spectral density;
- computing a cost function using the noise power, the cost function being dependent on the impulse response;
- reducing the dimensionality of a space over which the cost function is defined;
- and minimizing the cost function.
Software on a processor readable medium comprising instructions for causing a processor in a communication system to perform the following operations:
- measure received noise power spectral density;
- compute a cost function using the noise power, the cost function being dependent on an impulse response of a spectrally constrained impulse shortening filter;
- reduce the dimensionality of a space over which the cost function is defined;
- and minimize the cost function.
A method for equalizing a channel in a multiple carrier communication system, the channel being configured to receive a signal and including a spectrally constrained impulse shortening filter, the method comprising:
- measuring received noise power spectral density;
- computing a target spectral response having a magnitude constraint that is based on the measured noise power spectral density;
- selecting a frequency response of the spectrally constrained impulse shortening filter based on the target spectral response;
- and
- filtering the communication signal with the spectrally constrained impulse shortening filter.
An article comprising a machine-readable medium storing machine-readable instructions that when applied to the machine cause the machine to:
- measure received noise power spectral density;
- compute a target spectral response having a magnitude constraint that is based on the measured noise power spectral density;
- select a frequency response of a spectrally constrained impulse shortening filter based on the target spectral response;
- and
- filter a communication signal with the spectrally constrained impulse shortening filter.
An article comprising a machine-readable medium storing machine-readable instructions that when applied to the machine cause the machine to:
- compute a target spectral response having a magnitude constraint that is based on measured noise power spectral density;
- shorten an impulse response of a channel in a multiple carrier communication system so that a significant part of an energy of the impulse response is confined to a region that is shorter than a target length;
- and
- filter a signal having a cyclic prefix based on the target spectral response.
Dependencies are inferred from the claim text.