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Licensed Unlicensed Requires Authentication Published by De Gruyter April 14, 2020

Impact of Pointing Error on the BER Performance of an OFDM Optical Wireless Communication Link over Turbulent Condition

  • Bobby Barua EMAIL logo and S. P. Majumder


An analytical approach is developed in this paper to evaluate the bit error rate (BER) performance of an optical wireless (OW) communication system with multiplexing of the RF orthogonal frequency division (OFDM) over turbulent condition taking into account the effect of pointing error. The received signal is detected through direct detection receiver followed by RF synchronous demodulation including the effect of OW channel and different form of noises such as receiver thermal noise, background channel noise and photo detector shot noise. Analysis is developed for an OFDM system over the OW channel, taking into account the effect of pointing error between the transmitter and the receiver in turbulent condition and the analysis reveals that the OFDM OW system is less affected by pointing error with deference to the major power penalty at BER performance. For instance, power penalty at BER 10−9 is found to be 3 dB for 256 OFDM subcarriers with 9 millidegree displacement angle at a data rate of 10 Gbps under turbulent condition. It is found that the system is more influenced by the atmospheric turbulence at a higher data rate.


1. Sadiku MN, Musa SM. Free space optical communications: an overview. Eur Sci J. 2016;12:55–68.Search in Google Scholar

2. Song X, Cheng J. Subcarrier intensity modulated optical wireless communications using non-coherent and differentially coherent modulations. IEEE/OSA J Lightw Technol. 2013;31:1906–13.Search in Google Scholar

3. Armstrong. OFDM for optical communications. IEEE/OSA J Lightw Technol. 2009;27:189–204.Search in Google Scholar

4. Bekkali A, Naila CB, Kazaura K, Wakamori K, Matsumoto M. Transmission analysis of OFDM based wireless services over turbulent radio-on-FSO links modeled by Gamma-Gamma distribution. IEEE Photonics J. 2010;2:509–20.Search in Google Scholar

5. Chaudharya S, Amphawanab A, Nisar K. Realization of free space optics with OFDM under atmospheric turbulence. Optik. 2014;125:5196–8.Search in Google Scholar

6. Nistazakis HE, Stassinakis AN, Sinanovic S, Popoola WO, Tombras GS. Performance of quadrature amplitude modulation orthogonal frequency division multiplexing based free space optical links with non-linear clipping effect over Gamma-Gamma modeled turbulence channels. IETO Pto-Electro. 2015;9:269–74.Search in Google Scholar

7. Barua B, Majumder SP. Bit error rate analysis of an OFDM subcarrier modulated FSO link with optical intensity modulation and a direct detection receiver. Int J Optic Photon Eng. 2019;4:1–11.Search in Google Scholar

8. Peppas KP, Stassinakis AN, Nistazakis HE, Tombras GS. Capacity analysis of dual amplify-and-forward relayed freespace optical communications systems over turbulence channels with pointing errors. Opt Comm Net. 2013;5:1032–42.Search in Google Scholar

9. Nazrul Islam AK, Majumder SP. Effect of pointing error on BER performance of a multi-wavelength OCDMA FSO system with SIK dual detector receiver. J Opt Comm. 2017;40:1–7.Search in Google Scholar

10. Al-Habash MA, Andrews LC, Phillips RL. Mathematical model for the irradiance probability density function of a laser beam propagating through turbulent media. Opt Eng. 2001;40:1554–62.Search in Google Scholar

Received: 2020-02-03
Accepted: 2020-03-25
Published Online: 2020-04-14

© 2020 Walter de Gruyter GmbH, Berlin/Boston

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