Real Time FPGA Investigation of Probabilistic Shaping 16QAM with HiDM and OFEC

Abstract

We investigate a PS-16QAM scheme employing HiDM and oFEC with FPGA implementation. By measuring BERs down to 10-15, we demonstrate that the PS scheme does not degrade the decoding performance of oFEC.

Energy-efficient implementation of probabilistic shaping

“…The PCS performance significantly influences the energy efficiency in entire systems as described above. HiDM, having tree-structured and layered look-up tables (LUTs), has been implemented on an FPGA several times [10,[13][14][15] because of the good balance between performance and complexity. This section proposes a modified HiDM for reducing the complexity further.…”

“…Several DM techniques have been proposed, such as constantcomposition DM [6], enumerative sphere shaping [7], hierarchical DM (HiDM) [8], and prefix-free code DM [9]. Among these, only HiDM and prefixfree code DM have been implemented on a fieldprogrammable gate array (FPGA) [10][11][12][13][14][15].…”