WO 2025/132969 A1: Methods, Devices and Programs for Demodulating a Data Frame

Abstract

The invention relates to a method for demodulating a data frame comprising N information words $[P_0, ..., P_{N-1}]$, in which a word $p_i$ occupying a position $i \in [0, N-1]$ in the frame is modulated by a symbol $C_{p_i}$ from a dictionary of $K$ symbols, wherein the method comprises the steps of determining (301), for a plurality of symbols $C_{p_i}$ and $C_{p_j}$ of the frame, where $i,j \in [0, N-1]$, a vector of $K$ probabilities $P_{i/j}$, referred to as the relative distribution, comprising probabilities associated with $K$ possible values of an estimated difference between the symbols $C_{p_i}$ and $C_{p_j}$; combining (303) a relative distribution $P_{i/j}$ with a particular probability distribution mask $i/j$ determined (302) according to a characteristic of the channel; and demodulating (304) the frame on the basis of at least one portion of the combined distributions.