Results 51 to 60 of about 85,197 (284)

Signal Shaping for BICM at Low SNR [PDF]

, 2012
The mutual information of bit-interleaved coded modulation (BICM) systems, sometimes called the BICM capacity, is investigated at low signal-to-noise ratio (SNR), i.e., in the wideband regime. A new linear transform that depends on bits' probabilities is
Agrell, Erik, Alvarado, Alex
core   +2 more sources

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

A Simple Nonlinearity-Tailored Probabilistic Shaping Distribution for Square QAM [PDF]

, 2017
A new probabilistic shaping distribution that outperforms Maxwell-Boltzmann is studied for the nonlinear fiber channel. Additional gains of 0.1 bit/symbol MI or 0.2 dB SNR for both DP-256QAM and DP-1024QAM are reported after 200 km nonlinear fiber ...
Alvarado, Alex, Bayvel, Polina, Killey, Robert. I., Lavery, Domaniç, Li, Zhe, Liga, Gabriele, Semrau, Daniel, Shevchenko, Nikita A., Sillekens, Eric   +8 more
core   +2 more sources

An approximate mathematical model for estimating the influence of vibrations on attached elements of a mobile robot video system

Системный анализ и прикладная информатика, 2021
The problem of constructing and applying of mathematical model for assessing the influence of vibrations on the attached elements of the video system of a mobile robot is solved.
A. A. Lobaty, M. М. Tatur, A. K. Ibrahim   +2 more
doaj   +1 more source

Performance Comparison of PS Star-16QAM and PS Square-Shaped 16QAM (Square-16QAM)

IEEE Photonics Journal, 2017
We investigate and compare the performance of star-shaped 16-ary quadrature amplitude modulation (Star-16QAM) and square-shaped 16QAM (Square-16QAM) in the probabilistic shaping (PS) and uniform schemes with coherent detection.
Bo Liu, Ying Zhang, Kaihui Wang, Miao Kong, Lijia Zhang, Qi Zhang, Qinghua Tian, Xiangjun Xin   +7 more
doaj   +1 more source

Design and Performance Analysis of Probabilistically Shaped QAM Signals for Coherent FSO Systems with Gamma-Gamma Turbulence Channels

Applied Sciences, 2021
Probabilistic shaping (PS) is a promising technique to approach the Shannon limit. In this paper, we design a practical coded modulation scheme based on PS to improve the capacity of coherent free-space optical (FSO) links with quadrature amplitude ...
Ruotong Tian, Zhiyong Wu, Shuang Ma, Yucong Gu, Xueliang Li   +4 more
doaj   +1 more source

Flexible Filter Bank Multi-Carriers PON Based on Two-Dimensional Multiple Probabilistic Shaping Distribution

IEEE Access, 2019
We propose a filter bank multi-carriers (FBMC) passive optical network (PON) system based on 2-D multiple probabilistic shaping (MPS) distribution to achieve flexible and adjustable access bit-rates.
Lei Jiang, Bo Liu, Yaya Mao, Jianxin Ren, Xing Xu, Xiangyu Wu, Ying Zhang, Lijia Zhang   +7 more
doaj   +1 more source

Probabilistic Shaping-Assisted Bases Precoding in QAM Quantum Noise Stream Cipher

Photonics
We propose a probabilistic shaping-assisted base precoding quantum noise stream cipher (PSABP QNSC) scheme to effectively alleviate the encryption penalty in QAM QNSC systems.
Shuang Wei, Sheng Liu, Wei Wang, Chao Lei, Kongni Zhu, Mingrui Zhang, Yuang Li, Yunbo Li, Dong Wang, Dechao Zhang, Han Li, Yajie Li, Yongli Zhao, Jie Zhang   +13 more
doaj   +1 more source

Protograph-Based LDPC Code Design for Shaped Bit-Metric Decoding [PDF]

, 2015
A protograph-based low-density parity-check (LDPC) code design technique for bandwidth-efficient coded modulation is presented. The approach jointly optimizes the LDPC code node degrees and the mapping of the coded bits to the bit-interleaved coded ...
Böcherer, Georg, Liva, Gianluigi, Steiner, Fabian   +2 more
core   +3 more sources

A light‐triggered Time‐Resolved X‐ray Solution Scattering (TR‐XSS) workflow with application to protein conformational dynamics

FEBS Open Bio, EarlyView.
Time‐resolved X‐ray solution scattering captures how proteins change shape in real time under near‐native conditions. This article presents a practical workflow for light‐triggered TR‐XSS experiments, from data collection to structural refinement. Using a calcium‐transporting membrane protein as an example, the approach can be broadly applied to study ...
Fatemeh Sabzian‐Molaei, Fredrik Orädd, Konstantinos Magkakis, Magnus Andersson   +3 more
wiley   +1 more source