Orthogonal frequency digital multiplexing correlation canceller
First Claim
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1. A method of a priori conditioning of a communication signal having a plurality of channels, comprising:
- transmitting a data signal over one of the plurality of channels in a first processed data signal;
selecting an epoch aperture;
digitally filtering the plurality of channels;
monitoring the remaining plurality of channels over the epoch aperture to obtain corresponding channel response signals resulting from the transmission of the data signal over the one of the plurality of channels;
generating interference response signals based on the channel response signals, the interference response signals corresponding to the plurality of channels over the epoch aperture; and
modulating a second processed data signal by the interference response signals over the plurality of channels and the epoch aperture prior to digital filtering by a digital filter.
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Abstract
A correlation canceller modulates a communication signal over a plurality of channels and an epoch aperture by a plurality of interference response signals corresponding to linear response by one or more filtering effects to generate an inversely correlated communication signal.
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Citations
40 Claims
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1. A method of a priori conditioning of a communication signal having a plurality of channels, comprising:
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transmitting a data signal over one of the plurality of channels in a first processed data signal;
selecting an epoch aperture;
digitally filtering the plurality of channels;
monitoring the remaining plurality of channels over the epoch aperture to obtain corresponding channel response signals resulting from the transmission of the data signal over the one of the plurality of channels;
generating interference response signals based on the channel response signals, the interference response signals corresponding to the plurality of channels over the epoch aperture; and
modulating a second processed data signal by the interference response signals over the plurality of channels and the epoch aperture prior to digital filtering by a digital filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for a priori conditioning of a communication signal having a plurality of channels, comprising:
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a channel modulator operable to receive as input a plurality of data signals and modulate the data signals over a plurality of channels to generate a processed data signal having a corresponding plurality of communication channels;
a correlation canceller comprising a data store storing a plurality of interference response signals corresponding to a digital filter transfer function, the plurality of interference response signals defining an epoch aperture, the correlation canceller operable to modulate the processed data signal over the plurality of channels and the epoch aperture prior to digital filtering to generate an inversely correlated data signal;
a carrier modulator operable to modulate the inversely correlated data signal to generate a communication signal; and
a digital filter operable to receive as input the communication signal and filter the communication signal according to the digital filter transfer function to generate a filtered communication signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A signal processing system, comprising:
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a processing subsystem;
a data store subsystem in data communication with the processing subsystem; and
a communications subsystem in data communication with the processing subsystem and data store subsystem;
wherein the communication subsystem is operable to receive as input a plurality of data signals and modulate the data signals over a plurality of channels to generate a processed data signal having a corresponding plurality of communication channels; and
wherein the data store subsystem is operable to store processing instruction data to cause the processing subsystem to access a plurality of interference response signals corresponding to a digital filter transfer function and defining an epoch aperture, and to modulate the processed data signal over the plurality of channels and the epoch aperture prior to digital filtering to generate an inversely correlated data signal. - View Dependent Claims (26, 27, 28)
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29. A method of a priori conditioning of a communication signal having a plurality of channels, comprising:
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receiving a processed data signal having a plurality of data channels;
modulating the processed data signal over an epoch aperture and the plurality of data channels by a plurality of interference response signals corresponding to a digital filter transfer function of the digital filter and channel responses of the plurality of data channels to generate an inversely correlated data signal;
modulating the inversely correlated data signal to generate a communication signal. - View Dependent Claims (30, 31, 32, 33, 34, 35)
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36. A system for facilitating digital filtering through a digital filter by a priori conditioning of a communication signal having a plurality of channels, comprising:
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means for receiving a plurality of input data signals, for modulating the data signals over a plurality of channels, and for generating a processed data signal having a corresponding plurality of communication channels;
means for storing a plurality of interference response signals defining an epoch aperture and corresponding to a digital filter transfer function and channel responses of the plurality of communication channels, and for modulating the processed data signal over the plurality of channels and the epoch aperture prior to digital filtering to generate an inversely correlated data signal; and
means for digitally filtering the inversely correlated communication signal according to the digital filter transfer function to generate a filtered communication signal.
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37. A method of a priori conditioning of a communication signal having a plurality of channels, comprising:
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generating a processed data signal;
modulating the processed data signal over an epoch aperture and over the plurality of channels by a plurality of interference response signals to generate an inversely correlated data signal;
modulating and filtering the inversely correlated data signal to generate a filtered communication signal;
demodulating the filtered communication signal to generate a demodulated data signal;
correlating the demodulated data signal to obtain channel response data; and
generating and updating the interference response signals based on the channel response data. - View Dependent Claims (38, 39)
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40. A communication data signal transmitted over a carrier wave for reception and filtering by a digital filter, the communication data signal modulated over a plurality of channels and over an epoch aperture by a plurality of interference response signals corresponding to a digital filter transfer function of the digital filter and a plurality of channel response of the plurality of channels.
Specification