Error-Correction Coded Orbital-Angular-Momentum Modulation for FSO Channels Affected by Turbulence

Djordjević, Ivan B.; Anguita, Jaime A.; Vasić, Bane

doi:10.1109/jlt.2012.2206560

Cited by 55 publications

(20 citation statements)

References 20 publications

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“…This approach assists in representing the wave mathematically.The electric field of an LG beam travelling along z-direction [6], [7] can be expressed in cylindrical coordinates as:…”

Section: Representation Using Lg Beamsmentioning

confidence: 99%

“…It can also be seen that the l th mode of the LG beam has the azimuthal angular dependence of the form ! #) 7 [6]. The propagating EM wave consists of intertwined helical wave fronts, and consequently l is also called the winding number or topological charge [8].…”

Section: Representation Using Lg Beamsmentioning

confidence: 99%

“…Using Equation (1, 2), the orthogonality of different OAM states has been proved and, the principle of orthogonality [6] is given as follows: where the operator L,L denotes the scalar product. This principle holds good for equation (1) and has been verified here using MATLAB simulations.…”

Section: Representation Using Lg Beamsmentioning

confidence: 99%

“…This design allows different degrees of OAM modulation based on the extent of the twist introduced. This experimental arrangement has been modeled here on the standard microwave studio suite by means of an optimized set of equations, Equations (5,6,7), that was formed from the combination of the equations of a paraboloid and a helix so as to construct a parabolic dish with a similar radial cut as shown in Fig.2(a). Another method of OAM modulation would be the discretization of this dish into N steps and this has been proposed here.…”

Section: Oam Modulation In Rf Domainmentioning

confidence: 99%

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Simulation of the S-Band Photon Vorticity Modulation Scheme

Br²,

Gopinath³

et al. 2013

AJEA

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Electromagnetic (EM) vorticity modulation is a multi-carrier scheme that offers an enhanced spectral efficiency among the several conventional communication technologies. A mathematical model of the beam-front, carrying different orbital angular momentum (OAM) states, in the S-Band region of the radio frequency (RF) spectrum has been presented using the Laguerre-Gaussian (LG) beam, to describe the effect of RF vorticity and OAM modulation. Results from EM simulations are used to verify the orthogonality of OAM states and thereby highlighting its application in a multiuser environment. Two designs of antenna reflectors are being proposed to generate the orthogonal OAM states ( 1 and 2). The existence of the OAM states is visualized from the distribution of the current densities and magnetic fields over the aperture area of the reflectors.

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“…This approach assists in representing the wave mathematically.The electric field of an LG beam travelling along z-direction [6], [7] can be expressed in cylindrical coordinates as:…”

Section: Representation Using Lg Beamsmentioning

confidence: 99%

Section: Representation Using Lg Beamsmentioning

confidence: 99%

Section: Representation Using Lg Beamsmentioning

confidence: 99%

Section: Oam Modulation In Rf Domainmentioning

confidence: 99%

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Simulation of the S-Band Photon Vorticity Modulation Scheme

Br²,

Gopinath³

et al. 2013

AJEA

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“…In 2012, Djordjevic et al proposed an error-correction coded OAM modulation for the free space optical (FSO) channels affected by turbulence aberration [18]. Although the principle of GI system is quite different from FSO communication system, the implementation of each pixel in HGI scheme for multiple grayscale object can be regarded as a communication link with a special hologram at the transmitter and a particular coincidence measurement at the receiver.…”

Section: Introductionmentioning

confidence: 99%

Improving the Atmosphere Turbulence Tolerance in Holographic Ghost Imaging System by Channel Coding

Zhao

Wang

Gong

et al. 2013

J. Lightwave Technol.

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Atmospheric turbulence (AT) severely cuts down the image resolutions of holographic ghost imaging (HGI) since orbital angular momentum (OAM) entangled states are associated with the spatial distribution of wave-functions. In this paper, we investigate the method to improve AT tolerance in HGI system. Since Reed-Solomon (RS) codes are important non-binary error correction codes which have strong correcting ability against noise, we use RS codes to develop a RS-coded HGI scheme. In order to verify the improvement quantitatively, we compute and compare the Peak Signal-to-Noise ratio (PSNR) of the reconstructed image in HGI without and with RS codes. The numerical results show that PSNRs go down quickly with the increase of the strength of turbulence, and they are improved greatly by using RS codes. For different grayscale objects, the results show that the improvement by RS codes is enhanced with the increasing correction ability, but it does not work for the same object by enlarging its grayscale to suit for more errors.

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Coded Orbital Angular Momentum Based Free‐Space Optical Transmission

Djordjević

2016

Wiley Encyclopedia of Electrical and Electronics Engineering

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In this article, we explore orbital‐angular‐momentum‐based (OAM) free‐space optical (FSO) transmission systems using low‐density parity‐check (LDPC) coded quadrature phase‐shift keying (QPSK) modulation format. The theory of OAM modes is discussed first, followed by the schemes to generate, multiplex/demultiplex, and detect OAM modes. Then, the FSO transmission systems with and without atmospheric turbulence are studied. The spatial‐ and time‐varying atmospheric turbulence is simulated via fast‐changing phase patterns, which are recorded by modified von Karman spectrum statistics. The atmospheric turbulence effects are discussed in terms of the intensity profile of OAM beam and power distribution among adjacent mode channels. In addition, we review the performance of LDPC coding based FSO transmission systems with a single OAM mode and with OAM multiplexing.

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Error-Correction Coded Orbital-Angular-Momentum Modulation for FSO Channels Affected by Turbulence

Cited by 55 publications

References 20 publications

Simulation of the S-Band Photon Vorticity Modulation Scheme

Simulation of the S-Band Photon Vorticity Modulation Scheme

Improving the Atmosphere Turbulence Tolerance in Holographic Ghost Imaging System by Channel Coding

Coded Orbital Angular Momentum Based Free‐Space Optical Transmission

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