The optical scatter channel

Lerner, Robert M.; Holland, A.E.

doi:10.1109/proc.1970.7979

Cited by 17 publications

(3 citation statements)

References 17 publications

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“…(16) it follows that the independent scattered component power, ξ g , is transmitted through the first-order sub-channel when LOS blockage is considered, whereas under a nonblockage scenario this power is split among all the active Generalized-K sub-channels, with probabilities controlled by the discrete mixture coefficients m k . It should be pointed out here that possible contributions to the independent scattered signal term produced by the refractive and diffractive phenomena induced by the obstacle [20][21][22] are not considered in Eq. (16).…”

Section: Pdf Of the M-distribution Under Los Blockagementioning

confidence: 99%

Performance analysis of FSO communications under LOS blockage

et al. 2017

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Abstract:We analyze the performance of a free-space optical (FSO) link affected by atmospheric turbulence and line-of-sight (LOS) blockage. For this purpose, the atmospheric turbulence induced fading is modeled by the M-distribution, which includes the Gamma-Gamma distribution as special case. We exploit the fact that the physical interpretation of the M-distribution allows to split the optical energy through the propagation link into three different components: two coherent components and one incoherent scatter component. Based on this separation, we derive novel analytical expressions for the probability density function (PDF), for the cumulative distribution function (CDF) and for the moment generating function (MGF) of the M-distribution under the temporary blockage of the coherent components, hereinafter referred to as LOS blockage. Further, a new closed-form expression for the outage probability (OP) under LOS blockage is derived in terms of the turbulence model parameters and the LOS blockage probability. By means of an asymptotic analysis, this expression is simplified in the high-SNR regime and the OP in terms of the diversity order and diversity gain is then deduced. Obtained results show that the impact of the LOS blockage on the OP strongly depends on the intensity of the turbulence and on the LOS blockage probability.

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Section: Pdf Of the M-distribution Under Los Blockagementioning

confidence: 99%

Performance analysis of FSO communications under LOS blockage

et al. 2017

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“…It should be pointed out here that possible contributions to the independent scattered signal term produced by the refractive and diffractive phenomena induced by the obstacle [20][21][22] are not considered in Eq. ( 16).…”

Section: Pdf Of the M-distribution Under Los Blockagementioning

confidence: 99%

Understanding the performance of free-space optics [Invited]

Bloom

Korevaar

Schuster³

et al. 2003

J. Opt. Netw.

510

190

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We analyze the performance of a free-space optical (FSO) link affected by atmospheric turbulence and line-of-sight (LOS) blockage. For this purpose, the atmospheric turbulence induced fading is modeled by the M-distribution, which includes the Gamma-Gamma distribution as special case. We exploit the fact that the physical interpretation of the M-distribution allows to split the optical energy through the propagation link into three different components: two coherent components and one incoherent scatter component. Based on this separation, we derive novel analytical expressions for the probability density function (PDF), for the cumulative distribution function (CDF) and for the moment generating function (MGF) of the M-distribution under the temporary blockage of the coherent components, hereinafter referred to as LOS blockage. Further, a new closed-form expression for the outage probability (OP) under LOS blockage is derived in terms of the turbulence model parameters and the LOS blockage probability. By means of an asymptotic analysis, this expression is simplified in the high-SNR regime and the OP in terms of the diversity order and diversity gain is then deduced. Obtained results show that the impact of the LOS blockage on the OP strongly depends on the intensity of the turbulence and on the LOS blockage probability.

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“…It is reasonable to assume that when multip le -scattering effects predominate , as it . is likely they will in a low-visibility atmospheric chan n el , the optical comple x field envelopes receive d on two orthogonal polarizations will be independe nt identic ally-distributed zero-mean comp lex-Gaussian random processes wh ose sta t i stics ar e com ple t el y characterized by a space-time correlation f unction [9][10][11]. When the particle scattering function is sharply peaked in the fowa rd direction , various analytic tech niques (which have been used to study wave propagation through atmospheric turbulence) may be applied to explicitl y determine the desired space-time correlation function [iz , 13].…”

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confidence: 99%

Multipath Dispersion in Low Visibility Optical Communication Channels

Kennedy¹,

Shapiro²

1977

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of the research is to determine the effect of low-visibility scattering atmospheres upon optica l signals. There exists the potential for imp roving the operability of line-of-sight optica l comunica tion links by exploiting the scattered component of the received optica l signa l in addition to the unscattered part. Experiments were conducted under this contract to determine the bas i c proper t ies of the sca tt ered part of the transmitted optica l S I gna 1. 2. The above w o r k is of value since it provides basic knowledge on optica l conwiiun i cation channels under l ow-visibility condition s wh i ch wi l l a llow the scattered part of the transmitted signal to be usef.iI in communication links in addition to the unscattered part. This research may ma ke the development of new more sensitive optica l rece i vers possible wh i ch will increase the range of optica l communication channels des i gned for USAF use.

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The optical scatter channel

Cited by 17 publications

References 17 publications

Performance analysis of FSO communications under LOS blockage

Performance analysis of FSO communications under LOS blockage

Understanding the performance of free-space optics [Invited]

Multipath Dispersion in Low Visibility Optical Communication Channels

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