Field Measurements of Nonlinear Distortion in Digital Cable Plants (2014)

By Tom Williams and Belal Hamzeh, CableLabs and Ron Hranac, Cisco Systems

As cable networks transition from the carriage of analog TV signals to digital signals, the second- and third-order nonlinear distortion products, known as composite second order (CSO) and composite triple beat (CTB), are still present but now appear on conventional spectrum analyzers to be similar to random noise. Thus, to technicians the distortion energy is indistinguishable from random noise. A new digital signal processing (DSP) technique has been developed to process the spectral “noise” in a vacant band to determine if the energy is random, or correlated to a full-band nonlinear distortion signal that could have created it. This paper discusses the processing details of the new test method and presents lab, cascade, and field test results. These data demonstrate the operational benefits of making nonlinear distortion measurements in mostly- or alldigital cable plants.

By clicking the "Download Paper" button, you are agreeing to our terms and conditions.

Similar Papers

Field Measurements of Nonlinear Distortion in Digital Cable Plants
By Tom Williams and Belal Hamzeh, CableLabs and Ron Hranac, Cisco Systems
2014
Characterizing Network Problems Using DOCSIS® 3.1 OFDM RxMER Per Subcarrier Data
By Ron Hranac, Cisco Systems; James Medlock, Akleza,Inc.; Bruce Currivan, JJP Development; Roger Fish & Tom Kolze, Broadcom; Jason Rupe & Tom Williams, CableLabs; Larry Wolcott, Comcast
2019
Full Band Capture Revisited
By Ron Hranac, Cisco Systems; Chad Campbell, Intraway; Roger Fish & Tom Kolze, Broadcom; Even Kristoffersen & Aleksander Soeberg, Telia Norge; James Medlock, Akleza; Jason Rupe & Tom Williams, CableLabs; Paul Schauer & Larry Wolcott, Comcast
2020
Machine Learning Techniques for Equalizing Nonlinear Distortion
By Rob Thompson, Comcast; Xiaohua Li, State University of New York at Binghamton
2020
Statistical Properties Of Composite Distortions In HFC Systems And Their Effects On Digital Channels
By Dr. Ron D. Katznelson, Broadband Innovations, Inc.
2002
CableLabs' Ghost Canceller Testing Project
By Tom Williams, Cable Television Laboratories, Inc.
1992
Blueprint for 3 GHz, 25 Gbps DOCSIS
By John T Chapman & Hang Jin, Cisco Systems; Thushara Hewavithana, Intel Corporation; Rainer Hillermeier, Qorvo
2019
Return Path Linear Distortion and Its Effect on Data Transmissions
By Tom Williams, Holtzman Inc
2000
Analysis Of Two-Way Cable System Transient Impairments
By Richard S. Prodan, Ph.D. , Majid Chelehmal, Ph.D., Tom Williams, CableLabs
1996
Software Revolution of Field Meters Using a Field-Capable Measurement Device
By Anthony Curran & Andy Martushev, Comcast
2020
More Results >>