BASE-T Ethernet Coding with LDPC and Reed-Solomon Framing
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Solution Overview
Problem
Existing high-speed Ethernet transmission standards, such as 10GBASE-T, are not optimized for data rates lower than 10 Gbps, limiting their efficiency and error correction capabilities at lower data rates.
Innovation Solution
The proposed solution involves reorganizing bit groups in the 10GBASE-T transport frame to utilize sparser constellations like PAM8, enabling Reed-Solomon coding and combining it with LDPC coding for enhanced error detection and correction, allowing for more robust data transmissions at lower data rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 10GBASE-T transmission scheme is used, then bit error rate is very low (close to Shannon limit), but data rate is fixed at 10 Gbps and cannot be reduced to lower rates
Solution Approach 1:
The patent applies dynamics by making the coding scheme adjustable and adaptable to different data rate requirements. The system can dynamically select between different coding configurations (e.g., (2048, 1723) LDPC code for 10 Gbps, or other coding rates for lower speeds) based on the desired operating data rate, transforming a static 10GBASE-T scheme into a flexible multi-rate system while maintaining low bit error rates across all rates.
2Reliability
If LDPC coding with (2048, 1723) code is used, then error correction capability is enhanced, but coding overhead increases
Solution Approach 1:
The patent applies parameter changes by allowing flexible selection of LDPC code rates and configurations. Instead of being locked into the (2048, 1723) code, the system can adjust coding parameters (code rate, block size, etc.) to achieve the desired balance between error correction capability and overhead. This enables optimization for different channel conditions and data rate requirements, reducing overhead when possible while maintaining necessary reliability.
Data Source
AI summary
A BASE-T Ethernet transceiver is disclosed. The transceiver includes a BASE-T Ethernet transmit circuit that employs a data framing module. The data framing module includes an input interface to receive Ethernet block data bits, and, forward error correction encoder is coupled to the logic to encode at least a first portion of the data bits to generate first error check bits. A Reed-Solomon (RS) encoder is coupled to the logic to encode at least a second portion of the data bits in accordance with a Reed-Solomon error code to generate second error check bits. A symbol mapper modulates the Ethernet block data bits in accordance with an SQ64 constellation comprising back-to-back PAM8 symbols.