Symbol Mapping Circuit for Multi-Efficiency Modulation
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Solution Overview
Problem
The existing circuit configurations for symbol mapping in optical communication systems that use rewritable look-up tables (LUTs) to implement multiple types of multi-dimensional modulations face challenges in reducing circuit size, as they require multiple LUTs to support different spectral efficiencies, leading to increased circuit size and complexity.
Innovation Solution
A symbol mapping device is designed with a transmission data processing unit, parity generation units, and a shuffle unit that adjust and generate parity data based on the number of bits per time slot, allowing for efficient mapping to constellation points using a reduced number of LUTs, thereby minimizing circuit size by optimizing parity data generation and shuffling processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple LUTs are used to support different spectral efficiencies in multi-dimensional modulation, then the adaptability and versatility of the system is improved, but the circuit size increases
Solution Approach 1:
The patent implements a universal symbol mapping circuit that can perform multiple types of multi-dimensional modulation (4D, 8D, 16D, etc.) using a single LUT structure. The LUT is configured to handle different spectral efficiencies by mapping transmission data to constellation points in varying dimensional spaces, eliminating the need for separate LUTs for each modulation type while maintaining full adaptability across different spectral efficiency requirements
Solution Approach 2:
The patent merges multiple LUT functions into a single unified LUT that handles all multi-dimensional modulation schemes. Instead of having separate LUTs for 4D, 8D, 16D modulations, the invention combines these functions into one LUT that can be configured to perform any of these mappings, thereby reducing the total circuit size while preserving the ability to support multiple spectral efficiencies
Data Source
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AI summary
A symbol mapping device (1) includes a transmission data processing unit (11) receiving two transmission data having the same length, and if the length is a first length, uses the two transmission data as two output data without change, and if the length is less than the first length, adds dummy data to the two transmission data to generate two output data, each data having the first length; a parity addition unit (12) generating two parity-added transmission data based on the two output data, where the two parity-added transmission data each contain parity data added to the transmission data and each have a second length; a shuffle unit (13) extracting two modulation data, being data to be mapped, from the two parity-added transmission data generated by the parity addition unit (12); and a mapping processing unit (14) mapping the two modulation data to two time slots of constellation points.