FEC Block Synchronization Using Periodic Tagged Symbols
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Solution Overview
Problem
Existing FEC systems fail to maintain synchronization of FEC blocks due to undetected FEC enable sequences caused by bit errors or severe channel interferences, leading to decoding failures.
Innovation Solution
Introduce periodic transmission of tagged symbols with predefined patterns to synchronize FEC blocks by aligning their beginning and ending time points, enabling synchronization recovery even when FEC enable sequences are undetected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If FEC enable sequence is used to indicate start of FEC data transmission, then receiver can identify when FEC blocks are sent, but under severe channel interferences the enable sequence may be undetected causing loss of FEC block synchronization
Solution Approach 1:
The patent applies periodic action by inserting tagged symbols at regular intervals within FEC blocks. These periodic tagged symbols serve as reliable synchronization markers that the receiver can use to identify and align FEC blocks, replacing the unreliable FEC enable sequence detection method. The periodic tagged symbols ensure that even under severe channel interferences, the receiver can maintain synchronization by detecting these regularly occurring markers.
Solution Approach 2:
The patent introduces tagged symbols as intermediary elements between the transmitter and receiver. These tagged symbols act as mediators that carry synchronization information through the channel. Instead of relying on the FEC enable sequence which may be corrupted, the tagged symbols serve as intermediate synchronization markers that help the receiver recover and maintain FEC block alignment even when the enable sequence is undetected.
2Reliability
If tagged symbols are inserted to maintain FEC block synchronization, then synchronization can be recovered under channel interferences, but the communication protocol becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the FEC block structure into segments with embedded tagged symbols. Instead of modifying the entire FEC protocol complexly, the tagged symbols are inserted as distinct segments within the existing FEC block framework. This segmented approach allows synchronization functionality to be added without completely redesigning the protocol, reducing the overall complexity increase.
Solution Approach 2:
The tagged symbols serve multiple functions: they act as synchronization markers for FEC block alignment, provide timing references for the receiver, and can potentially carry additional control information. This multi-functionality reduces the need for separate dedicated synchronization mechanisms, thereby minimizing the increase in protocol complexity while achieving reliable synchronization recovery.
Data Source
AI summary
A forward error correction (FEC) synchronization method includes establishing a link between a source terminal and a sink terminal, transmitting a tagged symbol periodically from the source terminal to the sink terminal, identifying the tagged symbol by the sink terminal after the tagged symbol is received by the sink terminal, collecting a plurality of symbols transmitted from the source terminal for generating a plurality of FEC blocks received by the sink terminal after the tagged symbol is successfully identified, and synchronizing the plurality of FEC blocks between the source terminal and the sink terminal according to the tagged symbol. The tagged symbol includes predefined patterns.