Return Path Linear Distortion and Its Effect on Data Transmissions (2000)

By Tom Williams, Holtzman Inc

Much has been written on the operational challenges for cable systems caused by upstream noise, especially burst noise, radio frequency ingress, and common path distortion. There is also an upstream problem with linear distortions caused by discrete echoes, amplifier tilt, group delay and micro-reflections. Diplex and lightning filters in amplifiers, missing terminators, damaged components, design problems, and construction mistakes create these linear distortions. The effect of uncorrected linear distortions is to increase the bit error rate in the presence of random noise or other additive impairments. Uncorrected linear distortion also limits an operatorís ability to go to higher-order modulation schemes. In the return band a micro-reflection problem is aggravated by the low loss of the coaxial cable. This paper presents a burst reference signal measurement technique for measuring linear distortions on working plant as well as test data from active usptream cable plant. Simulation plots and curves show increases in intersymbol interference from linear distortions.

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

Similar Papers

Return Path Linear Distortion and Its Effect on Data Transmissions
By Tom Williams, Holtzman Inc
2000
Correlating Return-Band Impulsive Noise Measurements from Houses with Sheath Current Induction Test Results
By Tom Williams, Holtzman Inc. , Longmont, Colorado
1999
Field Measurements of Nonlinear Distortion in Digital Cable Plants
By Tom Williams and Belal Hamzeh, CableLabs and Ron Hranac, Cisco Systems
2014
Detection of Passive Intermodulation in Drop Wiring by Burst Transmission Analysis - Diodes are common, but the network resists
By Tom Williams, Cable Television Laboratories Inc.; Cable Television Laboratories Inc., Cable Television Laboratories Inc; Larry Wolcott, Comcast; Jason Rupe, Ph.D., CableLabs
2022
OFDMA Predistortion Coefficient and OFDM Channel Estimation Decoding and Analysis
By Tom Williams, Alberto Campos, Lin Cheng, James Lin, Jason Rupe & Jay Zhu, CableLabs
2021
Return Path And MTTR Improvements: New Tools, New Rules
By Bob Collmus, Scientific-Atlanta, Inc.
2001
On The Realities Of Non-Linear Distortion In CATV Amplifiers
By Jacob Shekel, Jerrold Electronics Corporation
1973
An Experimental Study of the Return-Path Performance of a DOCSIS System
By Thomas K. Fong, Ph.D. @Home Network, Bill Kostka Cable Television Laboratories, Inc and John Chen, Cisco Systems, Inc.
1999
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
CATV System Return Path Interference
By Harry J. Reichert, Jr,. General Instrument Jerrold Division
1982
More Results >>