PON De-Interleaving Synchronization for Interleaved Bit Streams
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Solution Overview
Problem
High-speed PON systems face issues with bit error diffusion and downlink synchronization due to interleaving encoding, making it difficult to determine synchronization in data flows.
Innovation Solution
Implement interleaving encoding with synchronization information distributed at intervals, followed by de-interleaving based on similarity thresholds and FEC decoding to establish downlink synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interleaving encoding is applied to data flow in high-speed PON systems, then bit error diffusion is reduced, but downlink synchronization becomes difficult to determine
Solution Approach 1:
The patent extracts synchronization information from the interleaved data flow by identifying specific patterns (such as continuous '1' sequences or specific bit patterns) that are deliberately placed at known intervals within the interleaved stream. This allows the receiver to locate synchronization points without needing to de-interleave the entire data flow first, thus maintaining both error diffusion benefits and synchronization capability.
Solution Approach 2:
The patent performs preliminary synchronization by identifying synchronization patterns in the interleaved data flow before full de-interleaving and decoding. The receiver uses the distributed synchronization information to establish initial frame alignment and clock synchronization, then uses this preliminary synchronization state to guide the subsequent de-interleaving process, ensuring correct reconstruction of the original data.
2Reliability
If synchronization information is distributed throughout the data flow based on permutation interval, then synchronization can be maintained, but complexity of identifying synchronization points increases
Solution Approach 1:
The patent applies local quality by using distinct, easily identifiable synchronization patterns (such as sequences of continuous '1' bits or specific predetermined bit patterns) embedded at regular intervals within the interleaved data flow. These local synchronization markers have unique characteristics that differ from normal data, allowing the receiver to quickly identify them through simple pattern matching without complex processing, thus maintaining synchronization while minimizing added complexity.
Data Source
AI summary
A data processing method including receiving a data flow sent by an encoder side, where the data flow is a bit stream on which interleaving encoding is used, the data flow includes synchronization information, and the synchronization information is distributed in the data flow based on a first permutation interval, obtaining, from the data flow, first data information based on a first value interval and a first value length, where the first value interval is equal to the first permutation interval, and a difference between the first value length and a length of the synchronization information is less than or equal to a preset error value, and when a similarity between the first data information and the synchronization information exceeds a preset similarity threshold, performing de-interleaving on the data flow based on a start location of the first data information.