Performance of BPSK Subcarrier Intensity Modulation Free-Space Optical Communications using a Log-normal Atmospheric Turbulence Model

Tang, Xuan; Rajbhandari, Sujan; Popoola, Wasiu O.; Ghassemlooy, Zabih; Leitgeb, Erich; Muhammad, Sajid Sheikh; Kandus, Gorazd

doi:10.1109/sopo.2010.5504014

Cited by 31 publications

(10 citation statements)

References 12 publications

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“…As mentioned before, the rain is the dominant cause for attenuation in the RF link, whereas the fog is the most important cause for attenuation in the FSO link. An experiment setup for a hybrid network of FSO and 40 GHz backup link was established over a period of one year in Graz, Austria and prove that the combination of both technologies leads 99.93% instead of 96.8% availability of FSO alone [43], [45].…”

Section: Hybrid Fso and Mmwave With Diversity Combining Techniquesmentioning

confidence: 92%

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Free Space Optic and mmWave Communications: Technologies, Challenges and Applications

Ismail

Leitgeb

Plank

2016

IEICE Trans. Commun.

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SUMMARY Increasing demand in data-traffic has been addressed over the last few years. It is expected that the data-traffic will present the significant part of the total backbone traffic. Accordingly, much more transmission systems will be required to support this growth. A free space optic (FSO) communication is the greatest promising technology supporting high-speed and high-capacity transport networks. It can support multi Gbit/s for few kilometers transmission distance. The benefits of an FSO system are widespread, low cost, flexibility, immunity to electromagnetic field, fast deployment, security, etc. However, it suffers from some drawbacks, which limit the deployment of FSO links. The main drawback in FSO is the degradation in the signal quality because of atmospheric channel impairments. In addition, it is high sensitive for illumination noise coming from external sources such as sun and lighting systems. It is more benefit that FSO and mmWave are operating as a complementary solution that is known as hybrid FSO/mmWave links. Whereas the mmWave is susceptible to heavy rain conditions and oxygen absorption, while fog has no particular effect. This paper will help to better understand the FSO and mmWave technologies and applications operating under various atmospheric conditions. Furthermore, in order to improve the system performance and availability, several modulation schemes will be discussed. In addition to, the hybrid FSO/mmWave with different diversity combining techniques are presented.

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Section: Hybrid Fso and Mmwave With Diversity Combining Techniquesmentioning

confidence: 92%

“…Moreover, using SIM-BPSK results log 2 N more transmission efficiency compared to the OOK. However, it increases the power requirement [42], [43]. The power required for BPSK-SIM modulation is given as:…”

Section: Modulation Schemesmentioning

confidence: 99%

Free Space Optic and mmWave Communications: Technologies, Challenges and Applications

Ismail

Leitgeb

Plank

2016

IEICE Trans. Commun.

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“…The log-normal channel model for irradiance fluctuation in a turbulence induced fading channel is employed [3], [12]. For a wave traversing the atmosphere, the random changes in the index of refraction along the propagation path result in fluctuation of the irradiance and phase of the wave.…”

Section: Proposed Sim/sm With Receiver Diversitymentioning

confidence: 99%

SIM/SM-Aided Free-Space Optical Communication With Receiver Diversity

Hwang

Cheng

2014

J. Lightwave Technol.

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In this paper, we propose subcarrier intensitymodulation (SIM)/spatial modulation (SM)-aided free space optical communications with receiver diversity. Using computer simulation, the performances of the proposed SIM/SM scheme are investigated and compared with those of the conventional SIM scheme in an additive white Gaussian noise (AWGN) channel and in outdoor applications with lognormal atmospheric channels. The error performances are also mathematically analyzed in the AWGN channel for spectral efficiency of 2 bits/s/Hz in order to validate the simulation results. Numerical results show that the proposed SIM/SM scheme can outperform the conventional SIM for both channels with various spectral efficiencies. We also demonstrate that, by employing multiple receivers, the deleterious effect of scintillation on the proposed SIM/SM scheme has been further ameliorated. Furthermore, our proposed SIM/SM scheme with the receiver diversity gets more resistant to turbulence-induced fading, when the spectral efficiency and the number of receivers are increased.

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“…To achieve the same average optical power for all modulation schemes, the amplitude of OOK-RZ is made twice that of OOK-NRZ. The most commonly reported model for describing the atmospheric turbulence in the weak range is the log-normal model, and is given by: [14][15][16].…”

Section: Experimental Descriptionmentioning

confidence: 99%

“…The SIM binary phase-shift keying (SIM-BPSK), which does not requires an adaptive threshold, also benefits from a matured RF technology and a simple and low cost direct detection receiver design compared to the PoLSK. However, SIM-BPSK requires a higher average transmitted power than OOK due to the DC bias requirement and the likelihood of signal distortion and the signal clipping [14].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the performance of different modulation techniques under controlled FSO turbulence channel

Ijaz

Ghassemlooy

Ansari

et al. 2010

2010 5th International Symposium on Telecommunications

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Abstract-This paper experimentally investigates and compares the performance of the free space optics system employing three different modulation schemes, on-off keying (OOK) with nonreturn-to-zero (NRZ) and return-to-zero (RZ) and the binary phase shift keying (BPSK) operating under the turbulent atmosphere. The received average signal is measured and used to characterize the strength of the turbulence. The experiment is performed with a temperature gradient of 4 degrees at a wind velocity of 4 m/s. The temperature gradient within the controlled channel results in turbulence of a log irradiance variance of 0.002, which is classified as a very weak turbulence. The received signal eye diagram and power histograms are presented and analyzed for performance evaluation of the selected modulation schemes in the weak turbulence model.

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Performance of BPSK Subcarrier Intensity Modulation Free-Space Optical Communications using a Log-normal Atmospheric Turbulence Model

Cited by 31 publications

References 12 publications

Free Space Optic and mmWave Communications: Technologies, Challenges and Applications

Free Space Optic and mmWave Communications: Technologies, Challenges and Applications

SIM/SM-Aided Free-Space Optical Communication With Receiver Diversity

Experimental investigation of the performance of different modulation techniques under controlled FSO turbulence channel

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