Rate Adaptability Using LUT-Based Distribution Matching for Probabilistic Constellation Shaping
Ferreira, R. M.
Guiomar, F. P.
; Pissarra, P.
; Messias, A. C.
; Formiga, D. A.
; Rodrigues, M. M.
; Vilela, T. M.
; Reis, J.D.
IEEE Photonics Technology Letters Vol. 33, Nº 3, pp. 143 - 146, February, 2021.
ISSN (print): 1041-1135
ISSN (online): 1041-1135
Scimago Journal Ranking: 0,75 (in 2021)
Digital Object Identifier: 10.1109/LPT.2020.3045849
We investigate the flexibility of a LUT-based hierarchical DM for Probabilistic Constellation Shaping providing flexible net bit rates. Using a fixed parallelized input and output LUT-based architecture, including a flexible strategy to organize the input bits in each LUT, the proposed scheme shows an efficient performance in terms of rate loss vs. complexity, resulting in a DM solution to enable flexible bit rates with improved channel transmission. We use an 800G example design with soft-decision FEC to discuss the optimization strategy and to demonstrate the flexibility of the proposed method, enabling a high granularity bit rate operation in the range of 160 to 800 Gb/s with a rate loss always below 0.14 bits/symbol.