US 2018/0102840 A1 · SYSTEM AND METHOD FOR PILOT DATA DETECTION USING CORRELATION PEAK TRACKING

Abstract

During optical performance monitoring in low SNR conditions, the detection of pilot data may be more difficult because the detector may mistake noise for the pilot data signal. Systems and methods are disclosed herein that try to address this problem. In one embodiment, a pilot tone detector processes the received signal to determine a maximum correlation peak, and then performs tracking of the correlation peak over time. Unlike the pilot data signal, noise is typically more transient in nature. Therefore, if a correlation peak does not actually correspond to the pilot data signal, but instead corresponds to noise, then the correlation peak typically disappears over time when tracked. A search for a new correlation peak may then be performed. When a correlation peak is determined that actually corresponds to the pilot data signal, then the correlation peak typically remains when tracked.

Claims22

Dependent claims

A method for detecting pilot data comprising receiving a pilot signal carrying the pilot data and performing operations on the pilot signal including:

(i) for a bit of the pilot data:
performing correlation operations on the pilot signal over a first set of frequency values and at a plurality of phases to produce a first set of correlation values, and obtaining from the first set of correlation values an initial maximum correlation peak for use in pilot data detection;
and
(ii) for each bit of subsequent bits of the pilot data:
performing correlation operations on the pilot signal over a second set of frequency values and at a plurality of phases to produce a second set of correlation values, and obtaining a subsequent maximum correlation peak from the second set of correlation values for use in the pilot data detection, wherein the subsequent maximum correlation peak is selected from correlation values, in the second set of correlation values, that were produced for phases within a window around and encompassing a phase of the initial maximum correlation peak.

2 more elements

A pilot tone detector comprising a digital signal processor configured to detect pilot data carried by a received pilot signal, by performing operations including:

(i) for a bit of the pilot data:
performing correlation operations on the received pilot signal over a first set of frequency values and at a plurality of phases to produce a first set of correlation values, and obtaining from the first set of correlation values an initial maximum correlation peak for use in pilot data detection;
and
(ii) for each bit of subsequent bits of the pilot data:
performing correlation operations on the received pilot signal over a second set of frequency values and at a plurality of phases to produce a second set of correlation values, and obtaining a subsequent maximum correlation peak from the second set of correlation values for use in the pilot data detection, wherein the subsequent maximum correlation peak is selected from correlation values, in the second set of correlation values, that were produced for phases within a window around and encompassing a phase of the initial maximum correlation peak.

2 more elements

Dependencies are inferred from the claim text.

System and method for pilot data detection using correlation peak tracking

Life of this patent

System and method for pilot data detection using correlation peak tracking

Life of this patent

Abstract

Claims22