Hardware Implementation of Soft Mapper/Demappers in Iterative EP-based Receivers

This paper presents a comprehensive study and implementations onto FPGA device of an Expectation Propagation (EP)-based receiver for QPSK, 8-PSK, and 16-QAM. To the best of our knowledge, this is the first for this kind of receiver. The receiver implements a Frequency Domain (FD) Self-Iterated Linea...

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Bibliographic Details
Published in:arXiv.org 2024-06
Main Authors: Ian Fischer Schilling, Sahin, Serdar, Leroux, Camille, Cipriano, Antonio Maria, Jego, Christophe
Format: Article
Language:English
Subjects:
Field programmable gate arrays
Floating point arithmetic
Online Access:Get full text
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Summary:This paper presents a comprehensive study and implementations onto FPGA device of an Expectation Propagation (EP)-based receiver for QPSK, 8-PSK, and 16-QAM. To the best of our knowledge, this is the first for this kind of receiver. The receiver implements a Frequency Domain (FD) Self-Iterated Linear Equalizer (SILE), where EP is used to approximate the true posterior distribution of the transmitted symbols with a simpler distribution. Analytical approximations for the EP feedback generation process and the three constellations are applied to lessen the complexity of the soft mapper/demapper architectures. The simulation results demonstrate that the fixed-point version performs comparably to the floating-point. Moreover, implementation results show the efficiency in terms of FPGA resource usage of the proposed architecture.
ISSN:2331-8422