US 10,116,385 B2Granted

System and method for pilot data detection using correlation peak tracking

AssigneeHuawei Technologies Co., Ltd.

InventorsZhiping Jiang, Jianhong Ke, Dajiang Jin

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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 an optical signal from an optical channel, the optical signal comprising a pilot signal, the pilot signal carrying the pilot data;
detecting, by an optical-to-electrical converter, the pilot signal in the optical signal;
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.

6 more elements

A pilot tone detector comprising an optical-to-electrical converter and a digital signal processor, the pilot tone detector configured to receive an optical signal from an optical channel, the optical signal comprising a pilot signal carrying pilot data, wherein the optical-to-electrical converter is configured to detect the pilot signal in the optical signal, and wherein the digital signal processor is configured to receive the pilot data from the detected pilot signal by performing operations including:

(i) for a bit of the received pilot data:
performing correlation operations on the detected 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 received pilot data:
performing correlation operations on the detected 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.

Facts

Application: 15/336,130Filed 27 Oct 2016 · continuation
Priority: 8 Oct 2016
Published: US 2018/0102840 A112 Apr 2018
Granted: 30 Oct 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H04B 10/07953
Performance monitoring; Measurement of transmission parameters: monitoring or measuring OSNR, BER or Q
H04B 1/70754
With code phase acquisition: setting of search window, i.e. range of code offsets to be searched
H04B 1/7077
With code phase acquisition: multi-step acquisition, e.g. multi-dwell, coarse-fine or validation
H04B 1/7087
Synchronisation aspects: carrier synchronisation aspects