Upstream Burst Noise Detection in Cable Modems
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Solution Overview
Problem
Burst noise in communication systems is challenging to detect and mitigate due to its non-stationary nature and short duration, which can significantly impact data integrity and error correction in receivers.
Innovation Solution
A system and method for detecting upstream burst noise in cable modem systems, utilizing a burst noise detector that analyzes nulled sub-carriers to differentiate between Additive White Gaussian Noise and burst noise, allowing for adjustments to the receiver to reduce packet error rates and data rate degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver parameters are tuned to compensate for AWGN, then the receiver can handle stationary noise effectively, but it cannot adequately compensate for non-stationary burst noise
Solution Approach 1:
The patent segments the received signal into multiple components by performing Fourier transform to obtain frequency spectrum, identifying signal components, noise components, and burst noise components separately. This segmentation allows the receiver to process each noise type with appropriate parameters, resolving the contradiction between handling AWGN and adapting to burst noise.
Solution Approach 2:
The patent implements dynamic parameter adjustment by continuously monitoring the frequency spectrum and adapting receiver parameters based on detected burst noise characteristics. The system transitions from static parameter tuning (for AWGN) to dynamic parameter adjustment (for burst noise), enabling the receiver to adapt to non-stationary noise conditions while maintaining effectiveness against stationary noise.
2Reliability
If the receiver attempts to detect and correct burst noise, then data integrity improves, but the complexity of the receiver increases
Solution Approach 1:
The patent extracts burst noise characteristics from the received signal by performing Fourier transform and identifying specific frequency components that correspond to burst noise. By separating and extracting only the necessary burst noise information, the system achieves effective burst noise detection without implementing a fully complex burst noise correction system, thus balancing data integrity improvement with receiver complexity.
Solution Approach 2:
The patent introduces frequency spectrum analysis as an intermediary mechanism between the received signal and the correction process. The Fourier transform acts as an intermediary that converts the time-domain signal into frequency-domain representation, making burst noise detection easier without requiring direct complex time-domain analysis, thereby reducing overall receiver complexity while maintaining data integrity.
3Measurement precision
If the receiver processes all received signals with high precision to detect burst noise, then detection accuracy improves, but processing time increases
Solution Approach 1:
The patent applies local quality by focusing processing precision only on frequency components that are likely to contain burst noise, rather than uniformly processing all frequency components with high precision. By identifying and concentrating computational resources on specific frequency bands where burst noise is detected, the system achieves high detection accuracy while minimizing overall processing time.
Solution Approach 2:
The patent implements partial action by performing burst noise detection on selected frequency components rather than analyzing the entire spectrum with equal depth. The system applies Fourier transform and burst noise detection algorithms only to relevant portions of the signal where burst noise is suspected, achieving sufficient detection accuracy without the time cost of exhaustive full-spectrum analysis.
Data Source
AI summary
The present disclosure is directed to a system and method for detecting burst noise. The system and method are described in the exemplary context of a cable modem system and can be used in such a system to specifically detect upstream burst noise. Once detected, the system and method can adjust the upstream receiver that receives data corrupted by the upstream burst noise to reduce the potentially deleterious effects that the burst noise can have on, for example, the packet error rate and/or data rate of the upstream receiver.