Results 51 to 60 of about 21,014 (291)

Experimental Demonstration of Geometrically-Shaped Constellations Tailored to the Nonlinear Fibre Channel [PDF]

, 2018
A geometrically-shaped 256-QAM constellation, tailored to the nonlinear optical fibre channel, is experimentally demonstrated. The proposed constellation outperforms both uniform and AWGN-tailored 256-QAM, as it is designed to optimise the trade-off ...
Bayvel, P., Killey, R. I., Lavery, D., Semrau, D., Sillekens, E.   +4 more
core   +2 more sources

Bit-Metric Decoding of Non-Binary LDPC Codes with Probabilistic Amplitude Shaping

, 2018
A new approach for combining non-binary low-density parity-check (NB-LDPC) codes with higher-order modulation and probabilistic amplitude shaping (PAS) is presented.
Böcherer, Georg, Liva, Gianluigi, Steiner, Fabian   +2 more
core   +1 more source

Partial Enumerative Sphere Shaping

, 2019
The dependency between the Gaussianity of the input distribution for the additive white Gaussian noise (AWGN) channel and the gap-to-capacity is discussed.
Gültekin, Yunus Can, Koppelaar, Arie, van Houtum, W. J., Willems, Frans M. J.   +3 more
core   +1 more source

Reducing the Number of Transceivers with Probabilistic Constellation Shaping in Flex-Grid Over MCF Optical Backbone Networks

ICC 2023 - IEEE International Conference on Communications, 2023
This paper quantifies the potential reduction in the number of required transceivers that the use of probabilistic constellation shaping (PCS) can bring to Flex-Grid over multicore fiber (MCF) optical backbone networks, which can directly lead to a ...
J. Perelló, J. Gené, Junho Cho, S. Spadaro   +3 more
semanticscholar   +1 more source

Simple constellation shaping for BICM-ID

Tongxin xuebao, 2015
A novel method of constellation mapping is presented for bit-interleaved coded modulation (BICM) by combining geometry shaping with probabilistic shaping.The transmitted signal points of a practical signal constellation approach the optimal input ...
Qi LI, Lin ZHOU, Bo ZHANG, Bao-ming BAI
doaj   +2 more sources

Probabilistically-Shaped Coded Modulation with Hard Decision Decoding for Coherent Optical Systems

, 2017
We consider probabilistic shaping to maximize the achievable information rate of coded modulation (CM) with hard decision decoding. The proposed scheme using binary staircase codes outperforms its uniform CM counterpart by more than 1.3 dB for 64-QAM and
Amat, Alexandre Graell i, Liva, Gianluigi, Sheikh, Alireza   +2 more
core   +1 more source

Field Trial of SDN-Controlled Probabilistic Constellation Shaping Supporting Multiple Rates Over a Coupled-Core Multi-Core Fiber

Journal of Lightwave Technology, 2023
Space division multiplexing (SDM) is being investigated in support of traffic growth. SDM networks offer multiplexing over space and spectrum dimensions.
N. Sambo, A. Nespola, A. Sgambelluri, A. Marotta, L. Dallachiesa, R. Ryf, P. Castoldi, A. Mecozzi, T. Hayashi, A. Carena, C. Antonelli   +10 more
semanticscholar   +1 more source

AAA+ protein unfoldases—the Moirai of the proteome

FEBS Letters, EarlyView.
AAA+ unfoldases are essential molecular motors that power protein degradation and disaggregation. This review integrates recent cryo‐electron microscopy (cryo‐EM) structures and single‐molecule biophysical data to reconcile competing models of substrate translocation.
Stavros Azinas, Marta Carroni
wiley   +1 more source

LDPC Coded Modulation with Probabilistic Shaping for Optical Fiber Systems

, 2015
An LDPC coded modulation scheme with probabilistic shaping, optimized interleavers and noniterative demapping is proposed. Full-field simulations show an increase in transmission distance by 8% compared to uniformly distributed input.Comment: 3 pages, 3 ...
Alvarado, Alex, Böcherer, Georg, Fehenberger, Tobias, Hanik, Norbert   +3 more
core   +1 more source

Peak Power Reduction of OFDM Signals with Sign Adjustment [PDF]

, 2009
It has recently been shown that significant reduction in the peak to mean envelope power (PMEPR) can be obtained by altering the sign of each subcarrier in a multicarrier system with n subcarriers.
Hassibi, Babak, Sharif, Masoud, Tarokh, Vahid   +2 more
core   +1 more source