Prof. Kamran Kiasaleh Profile

Prof. Kamran Kiasaleh

Professor at Univ of Texas at Dallas

SPIE Involvement:

Author

Publications (19)

SPIE Journal Paper | 12 October 2023

Receiver architecture for on-off-keying free-space optical communications with channel estimation in the presence of residual spatial tracking error

Kamran Kiasaleh

OE, Vol. 63, Issue 04, 041203, (October 2023) https://doi.org/10.1117/12.10.1117/1.OE.63.4.041203

KEYWORDS: Receivers, Error analysis, Free space optics, Free space optical communications, Turbulence, Optical engineering, Adaptive optics, Signal to noise ratio, Signal detection, Signal attenuation

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SPIE Journal Paper | 24 November 2021

Adaptive subcarrier nulling for error vector magnitude and peak to average power ratio reduction in block coded OFDM-VLC

Nima Taherkhani, Kamran Kiasaleh

OE, Vol. 60, Issue 11, 116111, (November 2021) https://doi.org/10.1117/12.10.1117/1.OE.60.11.116111

KEYWORDS: Nulling interferometry, Remote sensing, Orthogonal frequency division multiplexing, Modulation, Distortion, Signal to noise ratio, Optical engineering, Receivers, Computer programming, Transmitters

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Proceedings Article | 11 June 2021 Open Access

A novel detection strategy for optical receivers with focal plane array

Kamran Kiasaleh

Proceedings Volume 11852, 118525H (2021) https://doi.org/10.1117/12.2599960

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Proceedings Article | 12 July 2019 Open Access

Nonlinear Array detection strategies for optical beams in long range fee-space optics channels

Kamran Kiasaleh

Proceedings Volume 11180, 111805P (2019) https://doi.org/10.1117/12.2536124

KEYWORDS: Receivers, Signal detection, Sensors, Palladium, Detector arrays, Free space optics, Channel projecting optics, Photodetectors, Interference (communication), Photon counting

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Proceedings Article | 25 September 2017 Open Access

Hybrid ARQ communications for severely degraded Hermite-Gaussian FSO link

Kamran Kiasaleh

Proceedings Volume 10562, 105622R (2017) https://doi.org/10.1117/12.2296242

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SPIE Journal Paper | 20 July 2017

Spatial beam tracking for Hermite–Gaussian-based free-space optical communications

Kamran Kiasaleh

OE, Vol. 56, Issue 07, 076106, (July 2017) https://doi.org/10.1117/12.10.1117/1.OE.56.7.076106

KEYWORDS: Optical tracking, Free space optical communications, Free space optics, Error analysis, Receivers

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SPIE Journal Paper | 30 September 2016

Probability density function of Hermite–Gaussian beam intensity in the presence of spatial error

Kamran Kiasaleh

OE, Vol. 55, Issue 09, 095109, (September 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.9.095109

KEYWORDS: Receivers, Error analysis, Free space optics, Gaussian beams, Telecommunications, Atmospheric optics, Optical tracking, Optical engineering, Free space optical communications, Ranging

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Proceedings Article | 21 August 2009 Paper

A novel spatial tracking for FSO communications through turbulent atmosphere

Kamran Kiasaleh

Proceedings Volume 7464, 74640Q (2009) https://doi.org/10.1117/12.826626

KEYWORDS: Free space optics, Avalanche photodetectors, Turbulence, Sensors, Optical tracking, Scintillation, Receivers, Atmospheric modeling, Error analysis, Signal detection

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Proceedings Article | 21 August 2009 Paper

Chase combining for on-off-keying FSO communications

Kamran Kiasaleh

Proceedings Volume 7464, 74640K (2009) https://doi.org/10.1117/12.825122

KEYWORDS: Receivers, Avalanche photodetectors, Free space optics, Scintillation, Transmitters, Turbulence, Signal detection, Automatic repeat request, Photon counting, Telecommunications

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SPIE Journal Paper | 1 February 2008

Receiver architectures for the detection of spatially correlated optical field using avalanche photodiode detector arrays

Michael Cole, Kamran Kiasaleh

OE, Vol. 47, Issue 02, 025008, (February 2008) https://doi.org/10.1117/12.10.1117/1.2870110

KEYWORDS: Receivers, Avalanche photodetectors, Signal detection, Sensors, Photon counting, Free space optics, Binary data, Error analysis, Signal to noise ratio, Optical engineering

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Proceedings Article | 1 September 2006 Paper

Optimum and suboptimum detection mechanisms for free-space binary PPM optical communication systems with APD detector arrays

Michael Cole, Kamran Kiasaleh

Proceedings Volume 6304, 63041C (2006) https://doi.org/10.1117/12.681392

KEYWORDS: Avalanche photodetectors, Receivers, Signal detection, Photons, Free space optics, Sensors, Error analysis, Signal to noise ratio, Binary data, Detector arrays

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Proceedings Article | 1 September 2006 Paper

Hybrid ARQ receiver for packet communications over free-space optical channels

Kamran Kiasaleh

Proceedings Volume 6304, 630407 (2006) https://doi.org/10.1117/12.681355

KEYWORDS: Receivers, Automatic repeat request, Free space optical communications, Free space optics, Photon counting, Error control coding, Channel projecting optics, Forward error correction, Transmitters, Modulation

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Proceedings Article | 1 September 2006 Paper

Beam-tracking in FSO links impaired by correlated fading

Kamran Kiasaleh

Proceedings Volume 6304, 63041I (2006) https://doi.org/10.1117/12.681374

KEYWORDS: Free space optics, Scintillation, Avalanche photodetectors, Atmospheric modeling, Turbulence, Receivers, Sensors, Error analysis, Optical tracking, Atmospheric scintillation

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Proceedings Article | 13 September 2005 Paper

Performance of APD-based binary PPM FSO systems

Kamran Kiasaleh

Proceedings Volume 5892, 58920S (2005) https://doi.org/10.1117/12.609593

KEYWORDS: Scintillation, Avalanche photodetectors, Receivers, Turbulence, Free space optics, Telecommunications, Binary data, Signal processing, Lead, Photon counting

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Proceedings Article | 13 September 2005 Paper

Impact of turbulence on multi-wavelength coherent optical communications

Kamran Kiasaleh

Proceedings Volume 5892, 58920R (2005) https://doi.org/10.1117/12.609595

KEYWORDS: Signal to noise ratio, Receivers, Turbulence, Optical communications, Sensors, Electromagnetic coupling, Radiation effects, Telecommunications, Heterodyning, Optical turbulence

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Proceedings Article | 26 April 2002 Paper

Performance analysis of free-space on-off-keying optical communication systems impaired by turbulence

Kamran Kiasaleh

Proceedings Volume 4635, (2002) https://doi.org/10.1117/12.464088

KEYWORDS: Scintillation, Telecommunications, Receivers, Gaussian beams, Forward error correction, Visibility, Free space optics, Signal detection, Atmospheric propagation, Channel projecting optics

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Proceedings Article | 26 April 1999 Paper

Performance enhancement of direct-detection optical communication systems impaired by pulse width inaccuracies using trellis-based pulse position modulation

Kamran Kiasaleh, Tsun-Yee Yan

Proceedings Volume 3615, (1999) https://doi.org/10.1117/12.346172

KEYWORDS: Avalanche photodetectors, Electrons, Modulation, Receivers, Error analysis, Signal detection, Sensors, Information operations, Optical communications, Laser energy

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SPIE Journal Paper | 1 November 1994

On the probability density function of signal intensity in free-space optical communications systems impaired by pointing jitter and turbulence

Kamran Kiasaleh

OE, Vol. 33, Issue 11, (November 1994) https://doi.org/10.1117/12.10.1117/12.181939

KEYWORDS: Turbulence, Scattering, Scintillation, Atmospheric optics, Atmospheric modeling, Telecommunications, Error analysis, Optical communications, Atmospheric propagation, Mathematical modeling

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Proceedings Article | 16 August 1994 Paper

Intensity fluctuations in the Compensated Earth-Moon-Earth Laser Link (CEMERLL) experiment

Bruce Levine, Kamran Kiasaleh

Proceedings Volume 2123, (1994) https://doi.org/10.1117/12.184667

KEYWORDS: Atmospheric propagation, Photons, Adaptive optics, Turbulence, Laser guide stars, Atmospheric turbulence, Laser beam propagation, Sensors, Telescopes, Speckle pattern

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The objectives of the CEMERLL experiment are to measure the signal enhancement obtained in a two way laser propagation link using laser guidestar adaptive optics from the Earth to the Moon using the Apollo retroreflector arrays, and to predict and verify the resulting signal strength and variability. A theory is presented for the probability density functions of the laser link by combining multiple effects of the: 1) compensated laser uplink through turbulence, 2) reflection from the lunar retroreflector array, 3) passage through turbulence on the downlink, aperture averaging by the receiving telescope, and 4) signal detection with a photovoltaic detector. The most important element in the chain is the uplink propagation, all other effects propagation effects modify only the mean number of photons of this two way link, and do not significantly change the probability density functions of the uplink laser beam. The resulting probability density functions are defined by parameters that include the effective number of scatterers, the average intensities in the specular and diffuse portions of the beam, and the beam jittering effect of using a laser guidestar. Using intensity moments derived from the far field propagation, performance data on the laser guidestar adaptive optics system, and approximations for higher order moments, the parameters of these distributions can be numerically evaluated from experimental conditions. These show a widely diffuse speckle pattern for the uncompensated beam, and a similar shaped but long tailed distribution for the compensated beam. Uncorrected tilt effects cause the well compensated beam to randomly jitter and results in an intensity distribution where there are some 'hits' of high intensity light, but more frequently there is a portion of the beam side lobes which illuminate the corner cube array. A separate tip-tilt correction using either an illuminated lunar feature or the return pulses themselves would mitigate this effect.

Showing 5 of 19 publications

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