Solar background effects in wireless optical communications

Sidorovich, V. G.

doi:10.1117/12.456303

Cited by 16 publications

(18 citation statements)

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“…Here, P d t,min is the minimum signal power of each of the transmitters and is set as P d t,min = P c t,min /2 in order to ensure the same average total transmit powerP t as for the conventional PAM signaling considered before. Also, n 1 = n th,1 + n b,1 and n 2 = n th,2 + n b,2 , where n th,1 and n th,2 represent thermal noise components with variance σ 2 th , and n b,1 and n b,2 represents background noise components with variance σ 2…”

Section: Differential Pam Signaling a Transmission Scheme And Fmentioning

confidence: 99%

Differential pulse‐amplitude modulation signalling for free‐space optical communications

Dabiri

Sadough

Khalighi

2019

IET Optoelectronics

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To improve the bandwidth efficiency of free-space optical (FSO) systems and at the same time to reduce the impact of the background noise, we propose a differential Mary pulse-amplitude modulation (M-PAM) signaling scheme that uses two laser transmitters. We first consider the condition that the receiver perfectly knows the instantaneous channel coefficient and compare the performance of the proposed differential PAM with the conventional PAM signaling and show the improved performance when the background noise level is relatively high. Second, we consider the practical situation where the receiver has to estimate the channel for signal detection. We propose an estimation scheme based on the characteristics of the differential PAM signaling while requiring no pilot symbol transmission. The proposed data-aided channel estimation is performed on a sequence of received PAM symbols. We show that for a sufficiently large observation window, the proposed estimation method allows achieving a performance close to the perfect channel knowledge.

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Section: Differential Pam Signaling a Transmission Scheme And Fmentioning

confidence: 99%

Differential pulse‐amplitude modulation signalling for free‐space optical communications

Dabiri

Sadough

Khalighi

2019

IET Optoelectronics

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“…At the input of a relay node, optical signal at the receiving lens includes not only data signal but also undesirable background radiations (also called background noise or ambient noise), which may consist of direct sunlight, reflected sunlight, or scattered sunlight from hydrometeor or other objects 1 [17]. As proposed in [18], background noise can be statistically modeled by a Poisson random process.…”

Section: A Proposed System Modelmentioning

confidence: 99%

“…The average BERs of conventional OAF relaying FSO systems in our analysis are presented in Appendix C. System parameters and constants are shown in Table I. The values of average background light power P b chosen in our analysis are 10 µW for scattered sunlight, 250 µW for reflected sunlight, and 10 mW for direct sunlight, based on experiment measurements [17]. The targeted BER of 10 −6 is set so that the operational performance (with BER ≤ 10 −9 ) can be achieved with forward error correction (FEC).…”

Section: End-to-end Bermentioning

confidence: 99%

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All-Optical Relaying FSO Systems Using EDFA Combined With Optical Hard-Limiter Over Atmospheric Turbulence Channels

Trinh

Dang

Pham

2015

J. Lightwave Technol.

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In this paper, a novel relaying technique is proposed to improve the bit-error rate (BER) performance and distance coverage of high-speed all-optical free-space optical (FSO) communication systems. Particularly, an optical amplifyand-forward (OAF) relaying technique using erbium-doped fiber amplifier (EDFA) combined with optical hard-limiter (OHL) is introduced. The use of OHL enables EDFA-based OAF relaying FSO systems to prevent the accumulation of amplified background noise, which significantly degrades the system performance when deploying multiple relays. For performance evaluation, we theoretically analyze the proposed system over atmospheric turbulence channels modeled by Gamma-Gamma distribution. A closed-form expression for the end-to-end BER bounds is therefore analytically formulated, taking into account other impacts of atmospheric channels including atmospheric attenuation and geometric spreading of the optical beam, as well as noises caused by background light and receiver. The numerical results, which are validated by Monte-Carlo (M-C) simulations, confirm the superiority of the proposed system in comparison with conventional ones.Index Terms-Optical amplify-and-forward relaying, optical hard-limiter, EDFA, background noise, atmospheric turbulence, channel loss, FSO communication systems.

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“…Ambient light can be physically interpreted as an additional unwanted electromagnetic radiation with flat frequency characteristic in the bandwidth of the detector [28]. We model ambient noise as an additive Gaussian noise with zero mean and standard deviation as a parameter, which determines the power of ambient light.…”

Section: Ambient Lightmentioning

confidence: 99%

Comparison of hard‐decision and soft‐decision channel coded M‐ary PPM performance over free space optical links

Muhammad¹,

Javornik²,

Jelovcan³

et al. 2008

Trans Emerging Tel Tech

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Error control coded M-ary pulse position modulation (PPM) can be used over free space optical links to mitigate the atmospheric attenuations and the turbulence induced fading. In this paper, we present performance analysis for coded free space optics (FSO) communication systems operating over various atmospheric conditions. We justify the selection of higher state PPM as an appropriate modulation scheme for the links and provide a comparative analysis between hard decision decoded (Reed-Solomon, RS) and soft decision decoded (Turbo) channel coded PPM over varying link conditions. Simulation results strongly indicate RScoded PPM as a robust and well-performing coded-modulation scheme for the FSO links.

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Solar background effects in wireless optical communications

Cited by 16 publications

References 0 publications

Differential pulse‐amplitude modulation signalling for free‐space optical communications

Differential pulse‐amplitude modulation signalling for free‐space optical communications

All-Optical Relaying FSO Systems Using EDFA Combined With Optical Hard-Limiter Over Atmospheric Turbulence Channels

Comparison of hard‐decision and soft‐decision channel coded M‐ary PPM performance over free space optical links

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