Use of Markov chain in atmospheric channel modeling of free space laser communications

Zeinab Hajjarian, Jarir Fadlullah, Mohsen Kavehrad

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Scopus citations

Abstract

Free Space Optical (FSO) communications is a promising candidate for broadband applications, achieving bit rates far beyond possible by Radio Frequency (RF) technology. Communications via RF signals are generally reliable and well understood but cannot support emerging data rate needs unless they use a large portion of the precious radio spectrum. FSO communications offer enormous data rates but operate much more at the mercy of the environment. The perennial limitations of FSO communications are manifested in the channel attributes of scintillation (optical turbulence) and path obscurations. Both phenomena reduce the availability of the optical channel to support reliable communications. To design transmission techniques that operate optimally in channel obscurants, a good understanding of the channel behavior is necessary. In most prior works, Monte-Carlo Ray Tracing (MCRT) algorithm has been used to estimate channel parameters. This task is quite numerically intensive. The focus of this paper is on investigating the possibility of simplifying this task by a direct introduction of state transition matrices associated with standard Markov modeling into the MCRT computer simulations programs. We show that by tracing a photon's trajectory in space via a Markov chain model, the angular distribution can be calculated via simple matrix multiplications. We also demonstrate that the new approach produces results that are close to those obtained by MCRT and other known methods. The value of the proposed method lies in its simplicity and numeric efficiency compared to the computationally intensive MCRT.

Original languageEnglish (US)
Title of host publication2008 IEEE Military Communications Conference, MILCOM 2008 - Assuring Mission Success
DOIs
StatePublished - Dec 1 2008
Event2008 IEEE Military Communications Conference, MILCOM 2008 - Assuring Mission Success - Washington, DC, United States
Duration: Nov 17 2008Nov 19 2008

Publication series

NameProceedings - IEEE Military Communications Conference MILCOM

Other

Other2008 IEEE Military Communications Conference, MILCOM 2008 - Assuring Mission Success
CountryUnited States
CityWashington, DC
Period11/17/0811/19/08

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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    Hajjarian, Z., Fadlullah, J., & Kavehrad, M. (2008). Use of Markov chain in atmospheric channel modeling of free space laser communications. In 2008 IEEE Military Communications Conference, MILCOM 2008 - Assuring Mission Success [4753359] (Proceedings - IEEE Military Communications Conference MILCOM). https://doi.org/10.1109/MILCOM.2008.4753359