Impulse Noise Compensation via Common Mode Signal Detection
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Solution Overview
Problem
Existing methods for compensating for impulse noise in subscriber lines, such as common mode noise cancellation, often increase overall noise levels and face challenges in determining proper filtering coefficients, limiting their effectiveness in maintaining signal quality and data transmission speed.
Innovation Solution
A receiver system that separates encoded data signals into common mode (CM) and differential mode (DM) signals, detects impulse noise in the CM signal, and marks affected sub-words in the DM signal as erasures, allowing for improved error correction through FEC decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If common mode noise cancellation is used to filter impulse noise from differential mode signal, then impulse noise is decreased, but overall noise in the differential mode signal increases
Solution Approach 1:
The patent extracts only the necessary information from the common mode signal (impulse noise detection) without adding the full common mode signal content to the differential mode signal. By using the common mode signal solely for detecting impulse noise events and marking affected sub-words, the system avoids the noise addition problem while still achieving impulse noise compensation through erasure decoding.
2Object-affected harmful factors
If common mode signal filtering coefficients are optimized to reduce impulse noise, then impulse noise cancellation improves, but difficulty in learning proper coefficients increases
Solution Approach 1:
Instead of using complex adaptive filtering with difficult-to-learn coefficients, the patent uses a simple threshold-based detection mechanism on the common mode signal. The impulse noise detector uses a fixed threshold comparison, which is computationally simple and does not require learning or adaptation, thereby avoiding the complexity of coefficient optimization while still effectively detecting impulse noise events.
3Reliability
If frame blanking or retransmission is used to handle impulse noise, then data transmission reliability improves, but data transmission speed decreases
Solution Approach 1:
The patent performs preliminary action by detecting impulse noise events and marking affected sub-words as erasures before the decoding process. This allows the FEC decoder to be prepared in advance and efficiently correct the marked errors without requiring frame blanking or retransmission, thereby maintaining high data transmission speed while ensuring reliability through targeted error correction.
Data Source
AI summary
Embodiments of the present disclosure generally pertain to systems and methods for compensating for impulse noise. A system in accordance with an exemplary embodiment of the present disclosure comprises a receiver coupled to a subscriber line. The receiver is configured to receive an encoded data signal via the subscriber line and separate the signal into a common mode (CM) signal and a differential mode (DM) signal. The receiver is further configured to detect impulse noise on the CM signal and mark corresponding sub-words of the DM signal affected by the detected impulse noise as erasures. The receiver then decodes the DM signal based on whether the sub-words are marked as erasures.