Reference Power Vectors for the Optical LEO Downlink Channel

Giggenbach, Dirk; Shrestha, Amita; Moll, Francesc; Fuchs, Christian; Saucke, Karen

doi:10.1109/icsos45490.2019.8978994

Cited by 10 publications

(12 citation statements)

References 9 publications

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“…• Correlated fading channel: H i are dependent and identically distributed. The auto-correlation function or alternatively the power spectral density (PSD) of the random process is taken from the literature [12].…”

Section: Channel Modelmentioning

confidence: 99%

Coherent Communications for Free Space Optical Low-Earth Orbit Downlinks

Matuz

Zahr

Sauter

2022

GLOBECOM 2022 - 2022 IEEE Global Communications Conference

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This work addresses physical layer design aspects of coherent free-space optical downlinks from low-earth orbit satellites to ground. Achievable information rates are derived and assessed that include the availability of diversity, shaping, bitmetric decoding, repetition coding and automatic repeat request with maximum-ratio combining. A channel coding scheme is presented that approaches the theoretic limits within 1 dB. Extrinsic information transfer analysis for the free-space optical fading channel shows that a code design tailored to the additive white Gaussian noise channel is robust for fading channels with various parameters.

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Section: Channel Modelmentioning

confidence: 99%

Coherent Communications for Free Space Optical Low-Earth Orbit Downlinks

Matuz

Zahr

Sauter

2022

GLOBECOM 2022 - 2022 IEEE Global Communications Conference

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“…The structure of such synthesizer is described in Fig. 3 in the form of a block diagram, and is similar to the methodology presented in [12] for generating lognormal time series. First, a white Gaussian generator is used to generate independent samples that are passed through a Butterworth low pass filter (LPF) for controlling the fading dynamics.…”

Section: Virtual Conference 30 March-2 April 2021mentioning

confidence: 99%

“…The OGS receives data from a LEO satellite on a polar orbit at 693 km altitude, very similar in orbital characteristics to Sentinel 1 (https://sentinel.esa.int/web/sentinel/missions/sentinel-1). Every pass of the LEO over the OGS is split into six (6) sectors of equal duration that correspond to the elevation ranges [5][6][7], [7][8][9][10], [10][11][12][13][14][15], [15][16][17][18][19][20][21][22], [22-37], degrees. This convenient way of splitting the pass allows us to study the variability of the channel including all the effects in Table 2.…”

Section: Virtual Conference 30 March-2 April 2021mentioning

confidence: 99%

System-level benefit of variable data rate in optical LEO direct-to-earth links

Arapoglou

Mazzali

2021

International Conference on Space Optics — ICSO 2020

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The paper investigates the benefits of employing a Variable Data Rate (VDR) scheme in optical Low Earth Orbit (LEO) Direct-to-Earth (DTE) links at system level. In contrast to the Constant Data Rate (CDR) transmission approach adopted in current systems of the kind, the VDR scheme allows to optimize the data rate of the optical link within a satellite pass. Indeed, both the link budget and the atmospheric effects heavily depend on the satellite elevation angle, which varies significantly within a satellite pass. In order to thoroughly carry out the system level comparison between VDR and CDR, the paper first addresses all necessary aspects involved, including channel modeling, waveform and interleaver dimensioning, and link budget issues. For the scenario evaluated in the paper, the average throughput improvement of VDR versus CDR is found to be 100%. The paper also addresses interesting trade-offs concerning possible concepts of operations (ConOps) of the link once the VDR is in place. This preliminary work will be followed up by the Agency with further industrialized technology developments and system refinements.

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“…The atmospheric turbulence induces a fading on the optical signal. Concerning the fading statistics, in this paper the weak turbulence regime is used even for low elevation range, where the irradiance distribution may be approximated by a lognormal model [27]. 11 To generate representative fading time series to be used in Sec.…”

Section: A Channel Modeling and Link Variabilitymentioning

confidence: 99%

Variable Data Rate in Optical LEO Direct-to-Earth Links: Design Aspects and System Analysis

Arapoglou¹,

Colavolpe²,

Foggi³

et al. 2021

Preprint

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In the frame of ongoing efforts between space agencies to define an on-off-keying-based optical low-Earth-orbit (LEO) direct-to-Earth (DTE) waveform, this paper offers an in-depth analysis of the Variable Data Rate (VDR) technique. VDR, in contrast to the currently adopted Constant Data Rate (CDR) approach, enables the optimization of the average throughput during a LEO pass over the optical ground station (OGS). The analysis addresses both critical link level aspects, such as receiver (time, frame, and amplitude) synchronization, as well as demonstrates the benefits stemming from employing VDR at system level. This was found to be around 100% compared to a CDR transmission approach.

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Reference Power Vectors for the Optical LEO Downlink Channel

Abstract: The synthesis of numerical power vectors for optical satellite data downlinks through the atmosphere to optical ground stations is described. A set of standard time series is defined and their further application for estimation of transmission performance is shown.

Cited by 10 publications

References 9 publications

Coherent Communications for Free Space Optical Low-Earth Orbit Downlinks

Coherent Communications for Free Space Optical Low-Earth Orbit Downlinks

System-level benefit of variable data rate in optical LEO direct-to-earth links

Variable Data Rate in Optical LEO Direct-to-Earth Links: Design Aspects and System Analysis

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