Punctured N-Dimensional Constellation for Peak Power Efficient Optical Links
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional symbol constellations are optimized for noise sensitivity without considering the peak-to-average power ratio (PAPR) in one dimension, which limits the average transmit power in un-amplified optical fiber links.
Innovation Solution
A punctured N-dimensional symbol constellation design that excludes a subset of symbols from a full N-dimensional constellation, optimizing constellation geometry and binary mapping to maximize average transmit power while maintaining noise sensitivity, specifically under a 1D peak power constraint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional symbol constellations are used, then noise sensitivity is optimized, but peak-to-average power ratio (PAPR) in one dimension is not considered, limiting average transmit power
Solution Approach 1:
The patent extracts and removes specific symbols from the conventional N-dimensional symbol constellation to form a punctured constellation. By taking out symbols that cause high peak power in one dimension, the punctured constellation achieves better PAPR-1D performance while maintaining adequate noise sensitivity through the remaining symbols.
Solution Approach 2:
The patent changes the constellation parameters by selectively removing symbols based on their contribution to peak power. This parameter change transforms the conventional constellation into a punctured version that optimizes the trade-off between noise sensitivity and peak-to-average power ratio in one dimension.
2Productivity
If N-dimensional symbol constellations are used, then spectral efficiency increases, but device complexity increases
Solution Approach 1:
The patent segments the N-dimensional constellation into a punctured structure where specific symbols are removed. This segmentation simplifies the demapping process by reducing the number of possible symbol states, thereby lowering device complexity while maintaining high spectral efficiency through the remaining optimized symbol set.
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
The present disclosure relates to a data transmission procedure, and in particular, to a modulation method using a class of punctured N-dimensional symbol constellations. To this end, embodiments of the invention proposes a transmitting device, a signal format for the transmitting device, and a method, configured to be adapted for using the N-dimensional symbol constellations. The transmitting device is configured to generate a sequence of symbols by mapping a message onto a punctured N-dimensional symbol constellation, wherein the punctured N-dimensional symbol constellation is a full N-dimensional symbol constellation minus an exclusion set, which is a subset of symbols of the full N-dimensional symbol constellation. The full N-dimensional symbol constellation is a Cartesian product of N identical 1-dimensional symbol constellations.