FEC Header Bit Selection for Higher 10G EPON Encoding Gain
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Solution Overview
Problem
In the context of 10G EPON systems, existing FEC encoding methods treat redundancy information from line encoding as data, leading to reduced performance and increased overhead, which affects the encoding gain and power budget.
Innovation Solution
The proposed method excludes minor bits in the block header from FEC encoding, allowing for higher encoding gain without increasing transmission overhead, by involving only the major bit in FEC encoding, thus protecting fewer important information bits with the same size of check blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all bits in the block header are involved in FEC encoding, then more information bits are protected, but the encoding gain is reduced and overhead increases
Solution Approach 1:
The patent extracts the minor bit from the block header and excludes it from FEC encoding, while keeping the major bit included. This selective extraction allows the system to protect only the most critical information bits (major bit) with FEC, thereby improving encoding gain without significantly compromising reliability. The minor bit, being less critical for data integrity, is omitted from error correction to optimize overall system performance.
Solution Approach 2:
The patent applies different quality levels of error protection to different parts of the block header. The major bit, which carries critical information, receives full FEC protection, while the minor bit, containing less critical synchronization or control information, is excluded from FEC encoding. This differentiated approach optimizes the trade-off between reliability and encoding efficiency by allocating error correction resources selectively.
2Reliability
If all bits in the block header are involved in FEC encoding, then more information bits are protected, but transmission overhead increases
Solution Approach 1:
The patent removes the minor bit from the set of bits subjected to FEC encoding, thereby reducing the amount of data that requires check bytes. This extraction reduces transmission overhead since fewer information bits need to be protected by redundant check data, while still maintaining adequate protection for the critical major bit.
3Device complexity
If line encoding redundancy is treated as data in FEC encoding, then encoding is simplified, but encoding performance is reduced
Solution Approach 1:
The patent extracts and excludes the minor bit from FEC encoding input, thereby preventing line encoding redundancy from degrading FEC performance. By selectively excluding this specific bit, the system maintains simple encoding logic while avoiding the performance penalty that would result from encoding all block header bits including the redundant minor bit.
Data Source
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AI summary
The present invention relates to the communication field, and discloses a method and an apparatus for encoding, decoding, receiving and transmitting data to improve the encoding gain of the FEC encoding without increasing transmission overhead. In the present invention, no FEC encoding is performed for the minor bits in the block header of the information blocks. The block header may be a sync header. The bit indicative of the data type serves as a major bit, and is protected through FEC encoding; the bit for the only purpose of block synchronization serves as a minor bit, which is not involved in the FEC encoding and decoding. When the buffered data are deficient, padding blocks are padded into the buffer to trigger the FEC encoding in time; after the FEC encoding, the padding block is removed from the encoding result, thus avoiding transmission of unnecessary data.