20240022334. MULTI-LENGTH LOOK-UP TABLE SPHERICAL CONSTELLATION SHAPING simplified abstract (Infinera Corporation)
Contents
MULTI-LENGTH LOOK-UP TABLE SPHERICAL CONSTELLATION SHAPING
Organization Name
Inventor(s)
David S. Millar of San Jose CA (US)
Mehdi Torbatian of Ottawa (CA)
Han Henry Sun of San Jose (US)
MULTI-LENGTH LOOK-UP TABLE SPHERICAL CONSTELLATION SHAPING - A simplified explanation of the abstract
This abstract first appeared for US patent application 20240022334 titled 'MULTI-LENGTH LOOK-UP TABLE SPHERICAL CONSTELLATION SHAPING
Simplified Explanation
The abstract of this patent application describes an encoder circuit for an optical fiber link that converts a sequence of input bits into a sequence of symbols of a codeword. The symbols of the codeword define a predetermined transmission probability distribution. The input bit sequence is divided into subgroups, and each subgroup is used as an address to access a look-up table. The contents of the memory location addressed by each subgroup of bits are output as a corresponding portion of the codeword. The codeword portions are then assembled in a buffer and output to forward error correction circuitry. The contents of the look-up tables are determined based on a sphere constellation shaping.
- An encoder circuit is provided for an optical fiber link.
- The circuit maps an input sequence of bits to a sequence of symbols of a codeword.
- The symbols of the codeword define a predetermined transmission probability distribution.
- The input bit sequence is divided into subgroups.
- Each subgroup is used as an address to access a look-up table.
- The contents of the memory location addressed by each subgroup are output as a corresponding portion of the codeword.
- The codeword portions are assembled in a buffer and output to forward error correction circuitry.
- The contents of the look-up tables are determined based on a sphere constellation shaping.
Potential applications of this technology:
- Optical fiber communication systems
- Data transmission in high-speed networks
- Error correction in digital communication
Problems solved by this technology:
- Efficient encoding of input bit sequences into codewords
- Achieving a predetermined transmission probability distribution
- Error correction in data transmission
Benefits of this technology:
- Improved data transmission reliability
- Higher data transfer rates
- Reduced error rates in communication systems
Original Abstract Submitted
consistent with the present disclosure, an encoder circuit is provided at a transmit side of an optical fiber link that maps an input sequence of bits of fixed length k to a sequence of symbols of a codeword of length n, such that the symbols of the codeword define a predetermined transmission probability distribution. in one example, each subgroup of bits of the k input bit sequence is provided to a respective look-up table, whereby the sub-group of bits constitutes an address of a particular memory location in the corresponding look-up table. based on the address, the contents at the particular memory location addressed by each subgroup of bits are output as a corresponding portion of a codeword. each such codeword portion is provided to a further memory or buffer, such that the entire codeword is assembled in the buffer and output to forward error correction (fec) circuitry. in a further example, the contents of each memory location of each look-up table is determined based on a sphere constellation shaping.