Performance Analysis of XQAM in Log-Normal Turbulence with Pointing Error and Non-zero Boresight

Muhammad Nabeel Shahid, Shahzad Amin Sheikh, Furqan Haider Qureshi, Muhammad Zeeshan, Qasim Umar Khan

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

Abstract

In recent years, free-space optical (FSO) technology has gained fame in communication systems due to its high data rates and license-free feature. Cross quadrature amplitude modulation (X-QAM) is an optimum modulation scheme that uses odd bits per symbol and it has a low average symbol error rate (ASER) than rectangular quadrature amplitude modulation (R-QAM). In this paper, we theoretically investigate the performance of subcarrier cross quadrature amplitude modulation (SC-XQAM) corrupted by atmospheric turbulence in the presence of pointing errors (P.E) in FSO communications. We have considered boresight displacement, P.E effect, and atmospheric turbulence. To represent the atmospheric turbulence we consider Log-normal distribution that exhibits weak, moderate and strong weather effects. The P.E is employed using Rician distribution that incorporates boresight displacement. P.E is modeled using an optical beam radius and receiver aperture radius. The combination of these parameters will help enhance the average symbol error rate (ASER). Furthermore, we have derived an analytical expression that is used to develop numerical result. The ASER performance is observed against optical beam radius, P.E standard deviation and receiver aperture radius. In the end, the ASER performance is evaluated against SNR and Monte Carlo simulations are performed which validates the theoretical results.

Original languageEnglish
Title of host publicationICNCC 2019 - Proceedings of the 2019 8th International Conference on Networks, Communication and Computing
PublisherAssociation for Computing Machinery (ACM)
Pages127-132
Number of pages6
ISBN (Electronic)9781450377027
DOIs
Publication statusPublished - 13 Dec 2019
Externally publishedYes
Event8th International Conference on Networks, Communication and Computing, ICNCC 2019 - Luoyang, China
Duration: 13 Dec 201915 Dec 2019

Publication series

NameACM International Conference Proceeding Series

Conference

Conference8th International Conference on Networks, Communication and Computing, ICNCC 2019
Country/TerritoryChina
CityLuoyang
Period13/12/201915/12/2019

Keywords

  • Average symbol error probability
  • Boresight displacement
  • Log-Normal atmospheric turbulence
  • Optical beam radius
  • Receiver aperture radius
  • Rician pointing error model
  • Subcarrier cross quadrature amplitude modulation (SC-XQAM)

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