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Tuesday, July 28, 2020 | History

3 edition of Modulation and coding for throughput-efficient optical free-space links found in the catalog.

Modulation and coding for throughput-efficient optical free-space links

Costas N. Georghiades

Modulation and coding for throughput-efficient optical free-space links

by Costas N. Georghiades

  • 48 Want to read
  • 22 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Modulation (Electronics)

  • Edition Notes

    Other titlesModulation and coding for throughput efficient optical free-space links.
    StatementCostas N. Georghiades.
    SeriesNASA contractor report -- NASA CR-193079.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15388832M

    This modulation stack encodes 11 bit per symbol (PPM: 6 bit, FSK: 2 bit, PS-PQSK: 3 bit). We also replaced 4FSK by 2ODFM (2-channel multiplex) for comparison. With 64PPM-2OFDM-PS-QPSK a total of 12 bit are encoded (PPM: 6 bit, 2 OFDM channels with PS-QPSK: 2 × 3 bit). Both modulation stacks show a similar limiting sensitivity and are probably. Get this from a library! Advanced Free Space Optics (FSO): a Systems Approach. [Arun K Majumdar] -- This book provides a comprehensive, unified tutorial covering the most recent advances in the technology of free-space optics (FSO). It is an all-inclusive source of information on the fundamentals.

    A simple channel model of wireless optical links based spatial coding is described and two basic channel constraints are outlined. For representing the spatial patterns as signal points, a signal space based 2-D orthonormal basis functions is defined. In order to deal with these channel impairments, novel advanced techniques in modulation, detection, coding and signal processing are needed. This groundbreaking book represents a coherent and comprehensive introduction to the fundamentals of optical communications, digital signal processing (DSP), and coding for optical channels. This book.

      Peer-to-peer (P2P) traffic and other latency-tolerant data sources form a large portion of present-day backbone traffic. Traffic shaping has been introduced to reduce the amount of P2P traffic at the expense of the end-user experience. In this work, free-space optical (FSO) links are proposed as a means to connect internet service providers to the backbone to carry latency-tolerant traffic. About. Prof. Ghassemlooy received BSc (Hons.) in electrical and electronics eng. from Manchester Metropolitan Univ., UK () and MSc () & PhD () from Univ. of Manchester, UK. was a Post-Doctoral Research Fellow, City Univ. UK. joined Sheffield Hallam Univ. as a Lecturer, becoming a Professor in joined Univ. of Northumbria (UN), Newcastle, as an Associate .


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Modulation and coding for throughput-efficient optical free-space links by Costas N. Georghiades Download PDF EPUB FB2

Modulation and Coding for Throughput-Efficient Optical Free-Space Links # _., /; # Costas N. Georghiades 1 Electrical Engineering Department Texas A&M University College Station, Texas Tel/Fax: ()/ e-maih [email protected] • 1, Abstract Optical direct-detection systems are currently being considered for some.

Get this from a library. Modulation and coding for throughput-efficient optical free-space links. [Costas N Georghiades; United States.

National Aeronautics and Space Administration.]. Modulation and coding for throughput-efficient optical free-space links: NTRS Full-Text: View Document [PDF Size: MB] Author and Affiliation: Georghiades, Costas N.

(Texas A&M Univ., College Station, TX, United States) Abstract: Optical direct-detection systems are currently being considered for some high-speed inter-satellite links, where Cited by: 2.

Modulation and coding for throughput-efficient optical free-space links. By Costas N. Georghiades. Get PDF (1 MB) Abstract.

Optical direct-detection systems are currently being considered for some high-speed inter-satellite links, where data-rates of a few hundred megabits per second are evisioned under power and pulsewidth constraints.

Author: Costas N. Georghiades. Abstract: Adaptive modulation and coding can provide robust and spectrally efficient transmission over terrestrial free-space optical channels. Three adaptive modulation schemes are considered in this paper: (i) variable-rate variable-power adaptation, (ii) channel inversion, and (iii) truncated channel inversion by: Adaptive modulation and coding can provide robust and spectrally efficient transmission over terrestrial free-space optical channels.

Three adaptive modulation schemes are considered in this paper: (i) variable-rate variable-power adaptation, (ii) channel inversion, and (iii) truncated channel inversion schemes. It is shown that a simple channel inversion scheme performs comparable to a.

All-optical concepts to establish global Internet connectivity and access at high speed are described in this book, covering all aspects of fundamentals of free-space optical communications and high bandwidth fiber-optics backbones to design optical links suitable for various scenarios in a number of applications.

The Internet is now really. It can be argued that optical communications had its origins in ancient times, where modulated sunlight was often used to convey information over large distances. For example, mirrors have been used to create bright flashes of light in certain directions, producing a form of on–off modulation.

Similarly, blankets used to cover a signal fire periodically produced puffs of smoke that could be. In this paper, the performance of free-space coherent optical communication transmission system with mPPM-QPSK modulated signal is investigated.

By establishing an FSO hybrid modulation transmission experimental system, we experimentally implement a 10 Gbps mPPM-QPSK modulated signals FSO transmission under different turbulence strength.

Atmospheric Free-Space Optical Communications When an optical signal is transmitted through the atmosphere, atmospheric turbulence causes fluctuations in the amplitude and phase of the received wavefront, which can impair free-space optical links in much the same way that multipath fading affects radio-frequency wireless links.

The performance in weak AT can be improved by applying unequal power allocation to make free-space optical communication (FSO) links more distinguishable at the receiver. Receive diversity is considered to mitigate irradiance fluctuation and improve the robustness of the system to.

This book provides a comprehensive, unified tutorial covering the most recent advances in the technology of free-space optics (FSO). It is an all-inclusive source of information on the fundamentals of FSO as well as up-to-date information on the state-of-the-art in technologies available today.

Coding for Optical Channels. Ivan Djordjevic. William Ryan. Bane Vasic. In order to adapt to the ever-increasing demands for high-speed transmission and distance-independent connectivity, today’s network operators are implementing Gb/s per dense wavelength division multiplexing (DWDM) channel.

Abstract: In this paper we utilized the downlink channel data captured at the Optical Communication Test Laboratory (OCTL) in support of the Lunar Laser Communications Demonstration (LLCD) to evaluate the potential performance gain of using adaptive coding and modulation (ACM) scheme to increase data volume while mitigating weather impairment.

Free space optical communications standards shall be developed only to the extent necessary to ensure interoperability and cross-support. The working group will develop standards for the modulation, coding, interleaving, synchronization, and acquisition of optical communications signals.

Free-space optical communications, link budget, turbu-lence, fading. Introduction Free-space optical communication (FSO) systems (in space and inside the atmosphere) have developed in response to a growing need for high-speed and tap-proof communica-tion systems.

Links. More specifically, the SLS Area concentrates on layers 1 and 2 (of OSI protocol stack), namely: RF and modulation, channel coding and data link layer, for both long-haul (e.g.: spacecraft to ground) and proximity links (e.g.: orbiter to lander).

Books links. Book table of contents. Simon M K and Vilnrotter V Alamouti-type space-time coding for free-space optical communication with direct Effects of atmospheric turbulence and misalignment fading on performance of serial-relaying M-ary pulse-position modulation free-space optical systems with partially coherent.

In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be radio systems in the 20th century used frequency modulation (FM) or amplitude modulation (AM) for radio broadcast.

A modulator is a device that performs modulation. Optical Free Space Links for Satellite-Ground Communications Dirk Giggenbach German Aerospace Center (DLR), Tutorial held at.

ASMS/SPSC, Livorno, 7. Advanced Satellite Multimedia Systems Conference th. Signal Processing for Space Communications Workshop. We propose an efficient coded modulation scheme for multiple input/multiple output free-space optical systems with Q-ary pulse-position modulation.

It is based on multilevel coding and low-density.M. Simon and V. Vilnrotter, "Alamouti-type space-time coding for free-space optical communication with direct detection," IEEE Trans.

Wireless Commun., vol. 4. Ghosna, Fadi and Sibley, Martin J.N. () Pulse position modulation coding schemes for optical intersatellite links.

In: Proceedings of Computing and Engineering Annual Researchers' Conference CEARC’ University of Huddersfield, Huddersfield, pp.