FPGA Verification of a Single QC-LDPC Code for 100 Gb/s Optical Systems without Error Floor down to BER of 10−15

2011 ◽  
Author(s):  
Deyuan Chang ◽  
Fan Yu ◽  
Zhiyu Xiao ◽  
Yang Li ◽  
Nebojsa Stojanovic ◽  
...  
Keyword(s):  
Ldpc Code ◽  
Optical Systems ◽  
Error Floor ◽  
Fpga Verification

LDPC Code Construction with Low Error Floor Based on the IPEG Algorithm

2007 ◽  
Vol 11 (7) ◽  
pp. 607-609 ◽  
Author(s):  
Sung-ha Kim ◽  
Joon-sung Kim ◽  
Dae-son Kim ◽  
Hong-yeop Song
Keyword(s):  
Ldpc Code ◽  
Error Floor ◽  
Code Construction

Error Floor Estimation of Spatially-Coupled Irregular LDPC Code Ensembles

2018 ◽  
Author(s):  
Kengo Shibata ◽  
Shan Lu ◽  
Masakazu Yoshida ◽  
Krishna R. Narayanan ◽  
Jun Cheng
Keyword(s):  
Ldpc Code ◽  
Error Floor

Design of an LDPC code with low error floor

2005 ◽  
Author(s):  
Sang Hyun Lee ◽  
Kwang Soon Kim ◽  
Jae Kyun Kwon ◽  
Yun Hee Kim ◽  
Jae Young Ahn
Keyword(s):  
Ldpc Code ◽  
Error Floor

scholarly journals ACE spectrum of LDPC codes

2006 ◽  
Vol 16 (1) ◽  
pp. 33-36 ◽  
Author(s):  
Dejan Vukobratovic ◽  
Aleksandar Djurendic ◽  
Vojin Senk
Keyword(s):  
Ldpc Codes ◽  
Ldpc Code ◽  
Research Problem ◽  
Short Length ◽  
Error Floor ◽  
Code Graph ◽  
Construction Algorithms

Construction of short-length LDPC codes with good, both waterfall and error-floor, behavior is still an attractive research problem. Recently proposed construction algorithms in this field are based on remarkably simple ideas, but yet, their effectiveness can still be questioned. In this paper we investigate a novel measure of goodness of a given LDPC code namely its ACE spectrum, based on a previously introduced ACE metrics associated with each cycle in LDPC code graph.

Atomic Resolution in Crystal Aperture Stem

1990 ◽  
Vol 48 (1) ◽  
pp. 236-237
Author(s):  
J T Fourie
Keyword(s):  
Optical System ◽  
Spherical Aberration ◽  
Three Dimensional ◽  
Transmission Function ◽  
Optical Systems ◽  
Bragg Angle ◽  
Electron Optical System ◽  
Intimate Contact ◽  
Diffraction Effects ◽  
Design Aspect

The attempts at improvement of electron optical systems to date, have largely been directed towards the design aspect of magnetic lenses and towards the establishment of ideal lens combinations. In the present work the emphasis has been placed on the utilization of a unique three-dimensional crystal objective aperture within a standard electron optical system with the aim to reduce the spherical aberration without introducing diffraction effects. A brief summary of this work together with a description of results obtained recently, will be given.The concept of utilizing a crystal as aperture in an electron optical system was introduced by Fourie who employed a {111} crystal foil as a collector aperture, by mounting the sample directly on top of the foil and in intimate contact with the foil. In the present work the sample was mounted on the bottom of the foil so that the crystal would function as an objective or probe forming aperture. The transmission function of such a crystal aperture depends on the thickness, t, and the orientation of the foil. The expression for calculating the transmission function was derived by Hashimoto, Howie and Whelan on the basis of the electron equivalent of the Borrmann anomalous absorption effect in crystals. In Fig. 1 the functions for a g220 diffraction vector and t = 0.53 and 1.0 μm are shown. Here n= Θ‒ΘB, where Θ is the angle between the incident ray and the (hkl) planes, and ΘB is the Bragg angle.

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