Probability shaping log likelihood ratio acquisition method and apparatus

By simplifying the calculation formula and apparatus, the probability-integer log-likelihood ratio calculation applicable to multiple modulation formats for the same circuit design was realized, solving the problems of high computational complexity and poor compatibility in the prior art, and improving system performance and hardware efficiency.

CN116722927BActive Publication Date: 2026-05-29FIBERHOME TELECOMMUNICATION TECHNOLOGIES CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
FIBERHOME TELECOMMUNICATION TECHNOLOGIES CO LTD
Filing Date
2023-06-16
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

In the prior art, the calculation of the probability-integrated log-likelihood ratio is complex and not applicable to probability-integrated distributions other than MB distributions, resulting in high hardware implementation complexity and high bit error rate under low signal-to-noise ratio conditions, and it is not compatible with LLR calculation for multiple modulation formats.

Method used

A method and apparatus for obtaining the probabilistic shaped log-likelihood ratio are provided. The LLR calculation of 64QAM, 16QAM probabilistic shaped, uniform distribution and QPSK with non-MB distribution and MB distribution is realized through the same circuit design. The simplified calculation formula and apparatus are used, which are applicable to different modulation formats and reduce circuit complexity.

Benefits of technology

It simplifies the calculation of log-likelihood ratio in nonlinear channels, supports compatibility with multiple modulation formats, reduces hardware overhead, and works effectively within the normal signal-to-noise ratio range, thereby improving system performance.

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Abstract

The application discloses a probability shaping log likelihood ratio acquisition method, supports probability shaping log likelihood ratio calculation of non-MB distribution, can be used for non-linear channel performance optimization, can be compatible with LLR calculation of MB distribution probability shaping, uniform distribution and part of low-order modulation, has low circuit operation complexity, supports multi-functional merging design, can be realized by using the same circuit, reduces hardware cost compared with multiple independent realizations, when the probability distribution is known, probability value calculation is directly used, and there is no need to convert a shaping factor or to look up a shaping factor, and the method can work in a normal signal-to-noise ratio range and does not need to meet a higher signal-to-noise ratio condition. The application further provides a corresponding probability shaping log likelihood ratio acquisition device.
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