Methods and apparatus for adaptive compensation of signal bandwidth narrowing through finite impulse response filters
AssigneeJuniper Networks, Inc.
InventorsQiang Wang, Yang Yue
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Abstract
An apparatus includes a finite impulse response (FIR) filter to receive a digital signal and a transmitter, operatively coupled to the FIR filter, to transmit an analog signal, converted from the digital signal, to a communication channel. The FIR filer is configured to change at least one operating parameter based on a bandwidth of the analog signal after transmission in the communication channel. The bandwidth of the analog signal is estimated, using an estimator, based at least in part on raw sampling data generated by an analog-to-digital converter (ADC) operatively coupled to the transmitter.
Claims20
A method, comprising:
- receiving an analog signal from a communication channel, the analog signal being transmitted by a transmitter operatively coupled to (1) a finite impulse response (FIR) filter configured to receive a digital signal and (2) a digital-to-analog converter (DAC) configured to convert the digital signal into the analog signal;
- estimating a bandwidth of the analog signal based at least in part on raw sampling data generated by an analog-to-digital converter (ADC) operatively coupled to the transmitter;
- and
- sending a signal representing the bandwidth of the analog signal to the FIR filter so as to change at least one operating parameter of the FIR filter.
An apparatus, comprising:
- a receiver configured to receive an analog signal via a communication channel from a transmitter operatively coupled to (1) a finite impulse response (FIR) filter configured to receive a digital signal and (2) a digital-to-analog converter (DAC) configured to convert the digital signal into the analog signal;
- an analog-to-digital converter (ADC) operatively coupled to the receiver and configured to receive the analog signal;
- an estimator operatively coupled to the ADC and configured to estimate a bandwidth of the analog signal based on at least in part on raw sampling data generated by the ADC;
- and
- a transmission device operatively coupled to the estimator and configured to transmit a signal representing the bandwidth of the analog signal to the FIR filter so that the FIR filter changes at least one operating parameter in response to receiving the signal representing the bandwidth.
A method, comprising:
- receiving an analog signal from a communication channel;
- estimating a bandwidth of the analog signal, after transmission in the communication channel, based at least in part on raw sampling data generated by an analog-to-digital converter (ADC) operatively coupled to a transmitter, estimating the bandwidth of the analog signal including:
- performing Fourier transform of the raw sampling data to generate unfiltered spectrum;
- performing at least one of Savitzky-Golay filtering or moving average filtering to the unfiltered spectrum to generate filtered data;
- and
- estimate the bandwidth of the analog signal based on the filtered data;
- and
- sending a signal representing the bandwidth of the analog signal to a finite impulse response (FIR) filter, via least one of a network management device or an in-band signal, to control an operation of the FIR filter so as to adaptively compensate for bandwidth narrowing of a digital signal, the FIR filter being configured to receive the digital signal and operatively coupled to a digital-to-analog converter (DAC) configured to convert the digital signal to the analog signal.
Dependencies are inferred from the claim text.