Reset in a receiver using center of gravity of equalizer coefficients

摘要

A receiver applies a calibration method to compensate for skew between input channels. The receiver skew is estimated by observing the coefficients of an adaptive equalizer which adjusts the coefficients based on time-varying properties of the multi-channel input signal. The receiver skew is compensated by programming the phase of the sampling clocks for the different channels. Furthermore, during real-time operation of the receiver, channel diagnostics is performed to automatically estimate differential group delay and/or other channel characteristics based on the equalizer coefficients using a frequency averaging or polarization averaging approach. Framer information can furthermore be utilized to estimate differential group delay that is an integer multiple of the symbol rate. Additionally, a DSP reset may be performed when substantial signal degradation is detected based on the channel diagnostics information.

主权项

1. A method for operating a digital signal processor, comprising:
receiving a digital input vector; equalizing the digital signal vector using an adaptive equalizer to generate an equalized signal vector, the adaptive equalizer adaptively updating equalizer coefficients based on characteristics of the digital signal vector; determining a first center of gravity for equalizer coefficients corresponding to first channels of the digital input vector having a first polarization; comparing the first center of gravity to a first predefined range for the first center of gravity; and resetting the digital signal processor responsive to the first center of gravity falling outside the predefined range for the first center of gravity.