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Non-Coherent Multi-User Detection Based on Expectation Propagation

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Abstract

In this paper, we propose a novel soft-output multi-user detector for non-coherent multiple access with Grassmannian signaling under Rayleigh block fading. Our detector is based on expectation propagation (EP) approximate inference and has polynomial complexity in the number of users. A simplified version of this scheme coincides with a scheme based on soft minimum-mean-square-error (MMSE) estimation and successive interference cancellation (SIC). Both schemes, especially EP, produce accurate approximates of the true posterior. They outperform a baseline decoder based on projecting the received signal onto the subspace orthogonal to the interference in terms of both hard-detected symbol error rate and coded bit error rate.
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Dates and versions

hal-02556927 , version 1 (09-12-2021)

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Ngo Khac-Hoang, Maxime Guillaud, Alexis Decurninge, Yang Sheng, Subrata Sarkar, et al.. Non-Coherent Multi-User Detection Based on Expectation Propagation. 2019 53rd Asilomar Conference on Signals, Systems, and Computers, Nov 2019, Pacific Grove, United States. pp.2092-2096, ⟨10.1109/IEEECONF44664.2019.9049073⟩. ⟨hal-02556927⟩
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