Signal Analyzer Mitigating Wireless Interference in Cable Networks
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Solution Overview
Problem
Conventional cable networks face reliability issues due to lack of interference mitigation techniques for wireless signals like LTE, which cause interference with RF signals in the same frequency bands, leading to signal corruption and playback failures in set-top boxes and subscriber domains.
Innovation Solution
The implementation of signal processing hardware and software that detects modulation types, maps configuration values to monitor and mitigate wireless interference by communicating feedback messages to management resources, allowing for the allocation of secondary channels to ensure uninterrupted signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LTE wireless networks operate in the same frequency bands as cable networks, then wireless communication coverage is improved, but signal interference and reliability of cable signals deteriorate
Solution Approach 1:
The patent applies preliminary action by proactively detecting the presence of LTE signals before they cause significant interference degradation. The system continuously monitors for LTE signal characteristics and preemptively takes mitigation actions such as adjusting equalizer settings or switching to alternative channels before the interference becomes severe enough to cause playback failures.
Solution Approach 2:
The patent implements feedback mechanisms where the set-top box continuously monitors signal quality metrics and interference levels, then uses this information to dynamically adjust reception parameters. The system feeds back interference detection results to the signal processing circuitry, which automatically adjusts equalization settings or triggers channel switching based on the feedback loop.
2Length of moving object
If lower frequency wireless signals (700 MHz) are used, then signal propagation distance and coverage are improved, but interference impact on cable networks increases
Solution Approach 1:
The patent applies local quality by implementing frequency-selective mitigation strategies. Rather than treating all frequency ranges uniformly, the system identifies specific frequency bands where LTE interference is present and applies targeted equalization or filtering only to those affected frequency components, leaving other frequencies unaffected.
Solution Approach 2:
The patent changes processing parameters dynamically based on detected interference characteristics. When LTE signals are detected, the system adjusts equalizer tap weights, gain settings, and filtering parameters specifically for the affected frequency ranges, allowing optimal reception despite the presence of strong low-frequency interference.
3Ease of operation
If mobile devices are located in close proximity to set-top boxes, then user convenience is improved, but likelihood of wireless interference increases
Solution Approach 1:
The patent implements self-service by enabling the set-top box to automatically detect and mitigate interference from nearby mobile devices without user intervention. The system autonomously monitors for interference patterns characteristic of mobile device transmissions and automatically adjusts reception parameters or switches channels when interference is detected.
4Productivity
If LTE signals with high crest factor are transmitted, then wireless communication efficiency is improved, but ingress interference on RF cable signals increases
Solution Approach 1:
The patent applies preliminary action by detecting the high crest factor characteristics of LTE signals and preemptively adjusting equalizer settings and filtering parameters before the interference causes signal degradation. The system prepares mitigation strategies in advance based on detected signal characteristics.
Solution Approach 2:
The patent uses signal equalization and filtering circuitry as an intermediary between the interfering LTE signals and the cable network signals. These intermediary processing stages selectively attenuate the harmful high-crest-factor LTE components while preserving the desired cable network signals.
Data Source
AI summary
A signal analyzer resource monitors a signal in a downstream channel of a shared physical communication link. In response to detecting presence of wireless interference coupling onto the signal received in the downstream channel, the signal analyzer resource communicates a feedback message to a management resource (or other suitable resource) over an upstream channel of the shared physical communication link. The message indicates the presence of the wireless interference. According to a more specific configuration, the signal analyzer resource can be configured to: detect a type of modulation used to modulate data on a signal received in a channel over a shared cable network; map the detected type of modulation to a corresponding set of configuration values; and utilize the corresponding set of configuration values as a basis to monitor and/or detect a presence of wireless interference on the channel. The signal analyzer resource can mitigate affects of interference.