Adaptive equalizer performance monitor
OwnerHongbin Zhanginventor
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Abstract
In part, the disclosure relates to a method of equalizer performance monitoring. The method includes receiving a signal at a receiver; adjusting step size of an adaptive equalizer in response to changes in state of polarization (SOP) of the received signal, wherein adaptive equalizer is in communication with one or more digital signal processing DSP components, wherein the one or more DSP components are in communication with the receiver; and increasing or decreasing step size of adaptive equalizer in response to updates to one or more filter coefficients.
Claims15
A method of equalizer performance monitoring, comprising:
- receiving a signal;
- adjusting step size of an adaptive equalizer in response to changes in state of polarization (SOP) of the received signal, wherein the adaptive equalizer is in communication with one or more digital signal processing (DSP) components, the adaptive equalizer comprising one or more filter coefficients;
- increasing or decreasing the step size of the adaptive equalizer in response to updates to the one or more filter coefficients;
- determining a spectral correlation of an output of the adaptive equalizer;
- monitoring changes to the spectral correlation over time;
- updating the one or more filter coefficients in response to the spectral correlation changes;
- selecting a first trial matrix M(1) and a second trial matrix M(2) and applying the matrices M(1) and M(2) to output of the adaptive equalizer, wherein the matrices M(1) and M(2) are each a trial Jones matrix, and wherein the matrices M(1) and M(2) each comprise a parameter α=±α0;
- and
- synchronizing pilot symbols at the output of the adaptive equalizer, wherein the pilot symbols are represented by
- [
- E
- x
- E
- y
- ]
- .
A method of monitoring residual inter symbol interference, comprising:
- receiving a signal, wherein the signal is a linearly modulated digital signal;
- generating an equalizer output from an adaptive equalizer of the received signal, the adaptive equalizer comprising one or more filter coefficients;
- determining a spectral correlation of the equalizer output;
- monitoring changes to the spectral correlation over time, wherein monitoring the changes to the spectral correlation over time is independent of a signal-to-noise ratio (SNR) and a modulation format of the received signal;
- and
- updating the one or more filter coefficients in response to the spectral correlation changes, wherein the one or more filter coefficients for the adaptive equalizer are updated when the spectral correlation is greater than about 0.25.
A method of equalizer performance monitoring, comprising:
- adjusting a step size of an adaptive equalizer in response to changes in state of polarization (SOP) of a received signal;
- increasing or decreasing the step size of the adaptive equalizer in response to updates to one or more filter coefficients;
- determining a spectral correlation of an output of the adaptive equalizer;
- monitoring changes to the spectral correlation over time, wherein monitoring the changes to the spectral correlation over time is independent of a signal-to-noise ratio (SNR) and a modulation format of the received signal;
- and
- updating the one or more filter coefficients in response to the spectral correlation changes, wherein the one or more filter coefficients for the adaptive equalizer are updated when the spectral correlation is greater than about 0.25.
Dependencies are inferred from the claim text.