HFC Channel Failure Analysis Using Frequency Domain Slope
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Solution Overview
Problem
Conventional failure analysis methods in HFC networks are inadequate for accurately detecting and locating faults due to reliance on single parameter analysis from pre-equalization coefficients, leading to inaccurate reflection of physical line status.
Innovation Solution
A method and device that perform failure analysis by obtaining frequency domain response amplitude, performing linear fitting to determine channel slope values, and using these values for more comprehensive channel failure analysis, including interpolation and micro-reflection delay calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-equalization coefficients are used for failure analysis, then proactive network maintenance can be performed, but the analysis accuracy is insufficient due to single parameter analysis
Solution Approach 1:
The patent transitions from single-parameter analysis to multi-dimensional analysis by introducing frequency domain response amplitude and channel slope values. This dimensional expansion allows comprehensive characterization of cable faults through multiple parameters including attenuation slope, reflection coefficient, and frequency response characteristics, thereby improving measurement precision while maintaining proactive maintenance capability
Solution Approach 2:
The patent employs parameter transformation by converting pre-equalization coefficients into time domain tap coefficients and further transforming them into frequency domain response characteristics. This parameter change process extracts multiple features (amplitude, phase, slope) from the original coefficients, enabling more accurate failure analysis through enhanced parameter diversity
2Ease of operation
If conventional failure analysis methods are used, then the process is simple, but the fault detection accuracy is insufficient
Solution Approach 1:
The patent performs preliminary transformation of pre-equalization coefficients into time domain tap coefficients and frequency domain characteristics before actual failure analysis. This preliminary action prepares multiple analysis parameters in advance, enabling both simple operation through automated processing and high accuracy through multi-parameter evaluation of channel slope and frequency response
3Measurement precision
If multiple analysis parameters are introduced, then failure analysis accuracy improves, but the device complexity increases
Solution Approach 1:
The patent makes the pre-equalization processing structure multi-functional by enabling it to serve both its original signal equalization function and a new failure analysis function. The same tap coefficients and frequency domain processing units are utilized to extract multiple parameters (channel slope, attenuation characteristics, reflection coefficients), achieving high analysis accuracy without adding separate dedicated hardware for each measurement
Data Source
AI summary
A failure analysis method and device, where the method includes obtaining a frequency domain response amplitude of a channel from a hybrid fiber-coaxial (HFC) network, performing linear fitting on an effective portion of the frequency domain response amplitude to determine a channel slope value, and performing channel failure analysis according to the channel slope value. Failure analysis is performed according to the obtained channel slope value, and the channel slope value is a new failure analysis parameter. In this way, means of channel failure analysis increase, and channel failure analysis is more accurate.