HFC Coupling Device Upstream Path Noise Suppression
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Solution Overview
Problem
Conventional cable television networks are inefficient and have insufficient capacity, leading to noise interference issues that affect signal quality.
Innovation Solution
The implementation of noise-suppressing coupling devices, such as amplifiers and splitters, that dynamically control gain elements and use signal strength indicators to enable or disable upstream paths based on signal characteristics, reducing interference by distinguishing between desired signals and noise in a hybrid fiber coaxial (HFC) network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional cable television networks are used, then network coverage is provided, but noise interference occurs and signal quality deteriorates
Solution Approach 1:
The patent applies dynamics by making the amplifier's gain adjustable rather than fixed. The gain control circuit dynamically changes the amplifier's gain based on detected signal conditions, allowing the system to adapt to varying noise levels and signal requirements, thereby reducing noise interference while maintaining signal quality.
Solution Approach 2:
The patent implements feedback through the gain control circuit that continuously monitors the output signal from the amplifier and adjusts the gain accordingly. This closed-loop feedback mechanism ensures that noise interference is reduced while maintaining adequate signal strength, directly addressing the contradiction between noise reduction and signal quality.
2Illumination intensity
If amplifiers are used to boost signals, then signal strength increases, but noise interference also increases
Solution Approach 1:
The amplifier's gain is made dynamic through the gain control circuit that adjusts the amplification factor based on real-time signal conditions. This allows the system to provide high gain when needed for weak signals while reducing gain when noise is detected, thereby increasing signal strength only when necessary and minimizing noise interference.
Solution Approach 2:
The patent changes the parameter of amplifier gain dynamically based on signal conditions. The gain control circuit modifies the gain parameter in response to detected noise levels and signal strength, allowing the system to optimize the balance between signal amplification and noise reduction by adjusting this critical parameter.
3Productivity
If upstream paths are continuously enabled, then network capacity is maximized, but noise from inactive paths interferes with active paths
Solution Approach 1:
The patent applies dynamics by making the upstream path enable/disable state changeable rather than fixed. The gain control circuit dynamically adjusts the amplifier's operation based on detected signal conditions, allowing the system to enable upstream paths when signals are present and disable them when only noise is detected, thereby maximizing network capacity while minimizing noise interference.
Solution Approach 2:
The system performs self-service through the gain control circuit that automatically detects signal conditions and adjusts amplifier operation without external intervention. The amplifier monitors its own output and autonomously enables or disables upstream paths based on noise detection, allowing the network to self-optimize capacity while reducing interference from inactive paths.
Data Source
AI summary
A coupling device for use in a hybrid fiber coaxial (HFC) network may be configured to detect a control message and determine from the message a period for which a cable modem downstream is to be transmitting a desired transmission, disable an upstream path through it when there is only noise incident on the upstream path, and enable the upstream path during the period when a desired transmission from a cable modem downstream of the coupling device is incident on the upstream path. The coupling device may be a trunk amplifier, a distribution amplifier, or a splitter. The coupling device may comprise a single upstream interface coupled to a plurality of downstream interfaces. The enabling and/or disabling may be in response to a signal strength indicated by the SSI being below a threshold.