Characterizing ingress noise

摘要

Methods and devices for characterization of repetitious noise in cable networks are disclosed. A frequency band of interest is identified, a time trace of a signal parameter within the frequency band is obtained, and an autocorrelation of the time trace is computed to detect repetitious noise. The repetition frequency can serve as an indicator of the noise source type, and thus it can assist in noise segmentation.

主权项

1. A method for characterizing ingress noise in a cable network, the method comprising:
(a) identifying a first frequency band of a cable signal at a first location in the cable network; (b) obtaining a time trace of a first parameter of the cable signal in the first frequency band identified in step (a); (c) computing an autocorrelation function of the time trace, wherein a first autocorrelation peak at a first non-zero time delay identifies a first repetitive noise component of the ingress noise; (d) repeating steps (b) and (c); (e) averaging the autocorrelation functions computed in the repeated step (c) to compute an averaged autocorrelation function; and (f) determining a first repetition frequency of the first repetitive noise component from a time delay of a peak in the averaged autocorrelation function of step (e).