Visible Light Communication FEC with Shared GF(16)/GF(256) Encoding
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Solution Overview
Problem
Visible light communication systems face challenges in error correction due to channel noise and transceiver faults, particularly when using 4B6B and 8B10B line-codes, which require non-binary forward error correction (FEC) codes like Reed-Solomon codes, but existing solutions require separate encoder and decoder circuits for different finite fields, increasing complexity.
Innovation Solution
The implementation of a transmitter and method that uses Galois Field (GF) encoding and Reed-Solomon codes over GF(16) and GF(256) for error correction, allowing the same encoder and decoder hardware to process codes by leveraging the subfield relationship between GF(16) and GF(256), with an interleaver unit for efficient error correction in visible light communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate encoder and decoder circuits are used for different finite fields (GF(16) and GF(256)), then error correction performance is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal encoder and decoder circuit that can operate over multiple finite fields (GF(16) and GF(256)) by leveraging the subfield relationship. The same hardware circuit performs error correction for both 4B6B line coding (GF(16)) and 8B10B line coding (GF(256)) by dynamically configuring its operation based on the input data width and field requirements, eliminating the need for separate dedicated circuits for each finite field.
2Reliability
If Reed-Solomon codes are used for non-binary forward error correction in visible light communication, then reliability is improved, but the requirement for separate circuits for different finite fields increases device complexity
Solution Approach 1:
The patent changes the operational parameters of the Reed-Solomon encoder and decoder to adapt between different finite fields. By modifying the generator polynomial coefficients and field arithmetic operations based on whether GF(16) or GF(256) is required, the same circuit structure achieves optimal error correction performance for both 4B6B and 8B10B line coding schemes without requiring physically separate circuits.
Data Source
AI summary
A transmitter is capable of performing both Galois Field (GF) (16) and GF (256) encoding in a visual light communication system. The transmitter includes a GF (256) encoder. The transmitter also includes a first bit mapper configured to map a first number of bits to a second number of bits. The Galois Field (256) encoder is configured to receive and encode the second number of bits. The transmitter also includes a second bit mapper configured to map the second number of bits to the first number of bits. The transmitter also includes an interleaver unit that can pad bits based on a frame size and puncture the bits after interleaving and prior to transmission.