Software radio frequency canceller
AssigneeGeneral Electric Company
InventorsRichard Louis Zinser, Michael James Hartman, John Erik Hershey, John Anderson Fergus Ross
Life of this patent
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Abstract
A full-duplex RF communication system and corresponding methods use digital adaptive filters for interference cancellation. As provided, the techniques allow full-duplex radio frequency communication without frequency-, time-, or code-division multiplexing and without the use of hardware RF cancellers. Such techniques may be useful for wireless communication, such as cellular communication, radio communication, broadcasting, short-range point-to-point communication, wireless sensor networks, and wireless computer networks.
Claims29
A method comprising:
- receiving an analog primary signal from a radio receiver input port, an antenna, or a receiver front end;
- receiving an analog reference signal from a radio transmitter, wherein the radio transmitter is co-located with the radio receiver;
- converting the analog primary signal into a digital primary signal;
- converting the analog reference signal into a digital reference signal;
- and
- processing the digital reference signal with a dual loop digital adaptive filter, wherein the first filter of the dual loop digital adaptive filter uses the output of the second filter of the dual loop digital adaptive filter as one of the inputs for determining filter weights, to provide an output;
- and
- subtracting the output of the first filter of the dual loop digital adaptive filter from the digital primary signal to generate a digital cancelled signal.
3 The method of claim 1, comprising downconverting the digital primary signal and the digital reference signal to I and Q compoments prior to processing the digital primary and digital reference signals with two dual loop digital adaptive filters.
A device programmed with machine-readable instructions for:
- receiving an analog primary signal from a radio receiver input port, an antenna, or a receiver front end;
- receiving an analog reference signal from a radio transmitter, wherein the radio transmitter is co-located with the radio receiver;
- converting the analog primary signal into a digital primary signal;
- converting the analog reference signal into a digital reference signal;
- and
- processing the digital reference signal with a dual loop digital adaptive filter, wherein the first filter of the dual loop digital adaptive filter uses the output of the second filter of the dual loop digital adaptive filter as one of the inputs for determining filter weights, to provide an output;
- and
- subtracting the output of the first filter of the dual loop digital adaptive filter from the digital primary signal to generate a digital cancelled signal.
A full-duplex wireless communication system comprising:
- a receiver input port, antenna, or receiver front end capable of receiving an analog primary signal;
- a transmitter capable of transmitting an analog transmitted signal;
- a directional coupler capable of sampling a portion of the analog transmitted signal to provide an analog reference signal;
- a first analog to digital converter capable of converting the analog primary signal into a digital primary signal;
- a second analog to digital converter capable of converting the analog reference signal into a digital reference signal;
- and
- a processor comprising instructions for:
- processing the digital reference signal with a dual loop digital adaptive filter, wherein the first filter of the dual loop digital adaptive filter uses the output of the second filter of the dual loop digital adaptive filter as one of the inputs for determining filter weights, to provide an output;
- and
- subtracting the output of the dual loop digital adaptive filter from the digital primary signal to generate a digital cancelled signal.
A full-duplex wireless communication system comprising:
- a receiver input port, antenna, or receiver front end capable of receiving an analog primary signal;
- a transmitter capable of transmitting an analog transmitted signal;
- a directional coupler capable of sampling a portion of the analog transmitted signal to provide an analog reference signal;
- a first analog to digital converter capable of converting the analog primary signal into a digital primary signal;
- a second analog to digital converter capable of converting the analog reference signal into a digital reference signal;
- and
- a processor comprising instructions for:
- processing the digital reference signal with a first digital adaptive filter to provide a first output;
- subtracting the first output of the first digital adaptive filter from the digital primary signal to generate a first filtered signal;
- and
- processing the first filtered signal with a second digital adaptive filter to provide a second output, wherein the second output of the second digital adaptive filter is used as an input for determining filter weights of the first digital adaptive filter.
Dependencies are inferred from the claim text.