HIGHLIGHTS
SUMMARY
Over the past few years, the "conventional" equalizers/soft-demappers have started to evolve toward the designs incorporating machine_learning techniques,, The authors call this category of NN models based on MMSE as a regression equalizer (Reg.), but the authors can term them as a dual-stage soft-demapping (i.e. the NN MMSE post-equalizer followed by the AWGN demapper). Such a device is convenient insofar as the transmitted signal in digital communications is usually generated from a discrete finite-size constellation, e_g quadrature amplitude modulation, QAM. This type of receiver model, named in . . .
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