Reception device and estimation method

JPWO2025009156A1Pending Publication Date: 2025-01-09
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Patent Information

Application Number
JP2025530935
Authority / Receiving Office
JP · JP
Patent Type
Applications
Filing Date
2023-07-06
Publication Date
2025-01-09

AI Technical Summary

Technical Problem

Underwater acoustic communication is hindered by signal distortion due to double-selective fading and impulsive noise, leading to significant errors in estimating log-likelihood ratios when conventional methods assume an AWGN transmission path, especially at high amplitude values.

Method used

A receiving device and method that replace the probability density distribution of noise from a certain amplitude value with a normal distribution using noise measurements, calculating likelihood, likelihood ratio, or path metric based on a t-distribution, allowing for accurate error correction by using a density distribution table or t-distribution to improve log-likelihood ratio estimation.

Benefits of technology

This approach enhances error correction performance in underwater acoustic communication by accurately estimating log-likelihood ratios, reducing errors and improving bit string correction accuracy.

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Abstract

This reception device comprises: a calculation unit that calculates a likelihood, a likelihood ratio, a log-likelihood ratio, or a path metric on the basis of a probability distribution obtained by replacing a probability density from a certain amplitude value of the probability density distribution of a normal distribution with a given probability value, a noise distribution obtained by noise measurement, or a t distribution using one or more reception symbols and a set of one or more constellation symbol candidates; and an error correction unit that, if the likelihood, likelihood ratio, log-likelihood ratio, or path metric has been calculated on the basis of the noise distribution or the t distribution, performs error correction on the basis of the calculated likelihood, likelihood ratio, log-likelihood ratio, or path metric, and if the likelihood, likelihood ratio, log-likelihood ratio, or path metric has been calculated on the basis of the probability distribution, performs error correction after performing processing on the calculated likelihood, likelihood ratio, log-likelihood ratio, or path metric on the basis of the noise amplitude of each of the one or more reception symbols.　
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