Communications device with simultaneous transmit and receive and related methods
First Claim
Patent Images
1. A communications device comprising:
- a transmit path comprising first and second digital-to-analog converters (DACs) and having at least one non-linear characteristic;
a receive path operable simultaneously with said transmit path and at a same frequency as said transmit path;
said receive path comprising first and second analog-to-digital converters (ADCs); and
processing circuitry configured togenerate a baseband signal for said transmit path,generate a feedforward signal based upon the baseband signal,use the feedforward signal to reduce self-interference in said receive path from said transmit path, andpre-distort the baseband signal based upon the at least one non-linear characteristic;
said transmit path configured to generate an analog feedforward signal based upon the feedforward signal, and generate a transmit output signal;
said receive path comprising a combiner configured to combine the analog feedforward signal and an analog receive signal;
said processing circuitry comprising a sub-band predistorter configured to receive an input signal and generate in-phase (I) and quadrature (Q) signals, and a phase conversion circuit configured to receive the I and Q signals and output at least one intermediate signal, the baseband signal being based upon the at least one intermediate signal.
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Abstract
A communications device may include a transmit path, a receive path operable simultaneously with the transmit path and at a same frequency as the transmit path, and processing circuitry. The processing circuitry may be configured to generate a baseband signal for the transmit path, generate a feedforward signal based upon the baseband signal, and use the feedforward signal to reduce self-interference in the receive path from the transmit path.
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Citations
19 Claims
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1. A communications device comprising:
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a transmit path comprising first and second digital-to-analog converters (DACs) and having at least one non-linear characteristic; a receive path operable simultaneously with said transmit path and at a same frequency as said transmit path; said receive path comprising first and second analog-to-digital converters (ADCs); and processing circuitry configured to generate a baseband signal for said transmit path, generate a feedforward signal based upon the baseband signal, use the feedforward signal to reduce self-interference in said receive path from said transmit path, and pre-distort the baseband signal based upon the at least one non-linear characteristic; said transmit path configured to generate an analog feedforward signal based upon the feedforward signal, and generate a transmit output signal; said receive path comprising a combiner configured to combine the analog feedforward signal and an analog receive signal; said processing circuitry comprising a sub-band predistorter configured to receive an input signal and generate in-phase (I) and quadrature (Q) signals, and a phase conversion circuit configured to receive the I and Q signals and output at least one intermediate signal, the baseband signal being based upon the at least one intermediate signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A communications device comprising:
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a transmit path comprising first and second digital-to-analog converters (DACs); a receive path operable simultaneously with said transmit path and at a same frequency as said transmit path and configured to generate an error signal; said receive path comprising first and second analog-to-digital converters (ADCs); at least one antenna coupled to said transmit and said receive paths; and processing circuitry configured to generate a baseband signal for said transmit path, generate a feedforward signal as an inverted replica of the baseband signal and based upon the error signal, and use the feedforward signal to reduce self-interference in said receive path from said transmit path; said first and second DACs configured to respectively generate an analog feedforward signal based upon the feedforward signal, and a transmit output signal; said processing circuitry configured to generate the feedforward signal based upon the error signal comprising a difference between a scaled version of the baseband signal and the transmit output signal; said receive path comprising a combiner configured to combine the analog feedforward signal and an analog receive signal; said first ADC configured to generate a reference signal for said processing circuitry, the reference signal indicating at least one non-linear characteristic of said transmit path; said second ADC configured to generate a receive signal based upon a combined signal from said combiner; said processing circuitry comprising a sub-band predistorter configured to receive an input signal and generate in-phase (I) and quadrature (Q) signals, and a phase conversion circuit configured to receive the I and Q signals and output at least one intermediate signal, the baseband signal being based upon the at least one intermediate signal. - View Dependent Claims (10, 11, 12, 13)
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14. A method of operating a communications device comprising a transmit path including first and second digital-to-analog converters (DACs) and having at least one non-linear characteristic, and a receive path comprising first and second analog-to-digital converters (ADCs), the receive path being operable simultaneously with the transmit path and at a same frequency as the transmit path, the method comprising:
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operating processing circuitry coupled to the transmit and receive paths to generate a baseband signal for the transmit path, generate a feedforward signal based upon the baseband signal, use the feedforward signal to reduce self-interference in the receive path from the transmit path, and pre-distort the baseband signal based upon the at least one non-linear characteristic; operating the transmit path to generate an analog feedforward signal based upon the feedforward signal, and generate a transmit output signal, the receive path combining the analog feedforward signal and an analog receive signal; and operating a sub-band predistorter in the processing circuitry to receive an input signal and generate in-phase (I) and quadrature (Q) signals, and operating a phase conversion circuit in the processing circuitry to receive the I and Q signals and output at least one intermediate signal, the baseband signal being based upon the at least one intermediate signal. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification