Coherent free-space optical communications: Opportunities and challenges

FP Guiomar, MA Fernandes, JL Nascimento… - Journal of Lightwave …, 2022‏ - opg.optica.org
The ever-increasing data rate demand for wireless systems is pushing the physical limits of
standalone radio-frequency communications, thus fostering the blooming of novel high …

Survey on free space optical communication: A communication theory perspective

MA Khalighi, M Uysal - IEEE communications surveys & …, 2014‏ - ieeexplore.ieee.org
Optical wireless communication (OWC) refers to transmission in unguided propagation
media through the use of optical carriers, ie, visible, infrared (IR), and ultraviolet (UV) bands …

800G DSP ASIC design using probabilistic sha** and digital sub-carrier multiplexing

H Sun, M Torbatian, M Karimi, R Maher… - Journal of lightwave …, 2020‏ - opg.optica.org
The design of application-specific integrated circuits (ASIC) is at the core of modern ultra-
high-speed transponders employing advanced digital signal processing (DSP) algorithms …

Probabilistic constellation sha** for optical fiber communications

J Cho, PJ Winzer - Journal of Lightwave Technology, 2019‏ - opg.optica.org
We review probabilistic constellation sha** (PCS), which has been a key enabler for
several recent record-setting optical fiber communications experiments. PCS provides both …

Bandwidth efficient and rate-matched low-density parity-check coded modulation

G Böcherer, F Steiner, P Schulte - IEEE Transactions on …, 2015‏ - ieeexplore.ieee.org
A new coded modulation scheme is proposed. At the transmitter, the concatenation of a
distribution matcher and a systematic binary encoder performs probabilistic signal sha** …

Constant composition distribution matching

P Schulte, G Böcherer - IEEE Transactions on Information …, 2015‏ - ieeexplore.ieee.org
Distribution matching transforms independent and Bernoulli (1/2) distributed input bits into a
sequence of output symbols with a desired distribution. Fixed-to-fixed length, invertible, and …

On probabilistic sha** of quadrature amplitude modulation for the nonlinear fiber channel

T Fehenberger, A Alvarado… - Journal of Lightwave …, 2016‏ - ieeexplore.ieee.org
Different aspects of probabilistic sha** for a multispan optical communication system are
studied. First, a numerical analysis of the additive white Gaussian noise (AWGN) channel …

Joint coding-modulation for digital semantic communications via variational autoencoder

Y Bo, Y Duan, S Shao, M Tao - IEEE Transactions on …, 2024‏ - ieeexplore.ieee.org
Semantic communications have emerged as a new paradigm for improving communication
efficiency by transmitting the semantic information of a source message that is most relevant …

Normalized generalized mutual information as a forward error correction threshold for probabilistically shaped QAM

J Cho, L Schmalen, PJ Winzer - 2017 European Conference on …, 2017‏ - ieeexplore.ieee.org
We show that the normalized generalized mutual information represents an excellent
forward error correction (FEC) threshold for uniform as well as for probabilistically shaped …

Probabilistic sha** and forward error correction for fiber-optic communication systems

G Böcherer, P Schulte, F Steiner - Journal of Lightwave …, 2019‏ - ieeexplore.ieee.org
This tutorial paper provides a foundation for integrating probabilistic sha** (PS) and
forward error correction (FEC). A layered PS-FEC architecture consisting of a PS encoder …