Adaptive Erasure Marking for Burst Noise in Decoding Systems
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Solution Overview
Problem
Existing decoding systems in communication channels, particularly in terrestrial broadcasting systems, face challenges with severe fading and interference, where burst noise errors propagate and are not adequately corrected by conventional error decoders, leading to erroneous erasure marking and reduced error correction capability.
Innovation Solution
An apparatus and method that include a noise detector to identify burst noise, an inner decoder, and a reliability-determining unit that selectively adopts different criteria to determine reliability information, generating an indication signal for the outer decoder to improve error correction by adaptively marking erasure locations, enhancing the error-erasure decoder's capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a changeless criterion is used to determine reliability information, then the erasure marking procedure is simple, but erroneous erasure marking occurs under varying noise conditions
Solution Approach 1:
The patent applies dynamics by transitioning from a static, changeless criterion to a dynamic criterion that adapts based on noise conditions. The reliability-determining unit selects different determining criteria according to the first indication signal generated by the noise detector, allowing the system to adjust its behavior based on varying noise environments while maintaining both simplicity and accuracy in erasure marking.
2Device complexity
If the outer decoder uses only t-error correction capability, then the device complexity is low, but burst noise errors cannot be adequately corrected
Solution Approach 1:
The patent applies preliminary action by having the noise detector and reliability-determining unit identify and mark erroneous locations before the outer decoder processes the data. By pre-marking these locations as erasures, the system prepares the data in advance, allowing the outer decoder to efficiently correct burst noise errors without requiring excessive complexity, thus resolving the contradiction between device complexity and error correction capability.
3Productivity
If erroneously generated erasure marks are provided to the error-erasure decoder, then the decoding process completes, but the error correction capability is reduced and incorrect symbols may be generated
Solution Approach 1:
The patent applies feedback by implementing a noise detector that continuously monitors the input signal and generates an indication signal based on detected noise conditions. This feedback mechanism allows the reliability-determining unit to adjust its erasure marking decisions in real-time, preventing erroneous marks from being generated and ensuring that only accurate erasure information is provided to the outer decoder, thus maintaining both decoding completion and output accuracy.
Data Source
AI summary
A method and a related apparatus that decode an input signal to generate an output signal. The method includes determining burst noise locations corresponding to the input signal and generating a first indication signal accordingly, decoding the input signal to generate an inner-code decoded signal, selectively adopting one of a plurality of determining criteria according to the first indication signal to determine reliability information corresponding to the inner-code decoded signal and to generate a second indication signal accordingly, and decoding the inner-code decoded signal with reference to the second indication signal to generate the output signal.