Energy-efficient free-space optical communication by coded OAM modulation.

Ivan B. Djordjevic*, Jaime Anguita, Bane Vasic

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations


We study communication over atmospheric turbulence channels based on LDPC-coded signaling using multidimensional orbital angular momentum (OAM) signal constellations. Multidimensional signal constellation is obtained as the N-dimensional Cartesian product of a one-dimensional signal constellation originating from non-negative pulse-amplitude modulation. This scheme represents an energy efficient alternative, since a larger number of bits per symbol can be transmitted using a given bandwidth. We evaluate the performance of this scheme by determining conditional symbol probability density functions (PDFs) from numerical propagation data. Two cases are considered: (i) when conditional PDFs are known on the receiver side, and (ii) when conditional PDFs are not known and Gaussian approximation is used instead. We show that the OAM modulation is more sensitive to atmospheric turbulence as the number of dimensions increases. We also describe several applications of interest ranging from indoor wireless communications to intersatellite communications.

Original languageEnglish
Title of host publication2011 IEEE Global Telecommunications Conference, GLOBECOM 2011
StatePublished - 2011
Event54th Annual IEEE Global Telecommunications Conference: "Energizing Global Communications", GLOBECOM 2011 - Houston, TX, United States
Duration: 5 Dec 20119 Dec 2011

Publication series

NameGLOBECOM - IEEE Global Telecommunications Conference


Conference54th Annual IEEE Global Telecommunications Conference: "Energizing Global Communications", GLOBECOM 2011
Country/TerritoryUnited States
CityHouston, TX


  • Free-space optical communication
  • atmospheric turbulence
  • coded modulation
  • low-density parity-check (LDPC) codes
  • modulation
  • orbital angular momentum (OAM)


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