CSI estimation with pilot tone for scintillation effects mitigation on satellite optical communication

Choi, In Younk; Shin, Won Ho; Han, Sang Kook

doi:10.1016/j.optcom.2018.11.016

Cited by 6 publications

(3 citation statements)

References 11 publications

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“…We evaluated the proposed adaptive threshold RZ-OOK decision in simulation. The atmospheric turbulence effect was accommodated using the modeled turbulence channel with the properties of intensity variation, low frequency, and lognormal distribution [6,9,10]. The turbulence channels at 2 I σ of 0.1 and 0.4 were adopted in this simulation.…”

Section: Simulations and Resultsmentioning

confidence: 99%

“…where • is the ensemble average, and a larger σ 2 I value generates higher degree of intensity fluctuation [6]. The optical RZ-OOK signal is detected using PD to realize an optical to electrical conversion, and the electrical signal after PD r(t) is represented by…”

Section: Operation Principlementioning

confidence: 99%

“…However, the code rate is reduced by inserted redundant symbols. Pilot tones were applied to carry the knowledge of CSI by inserting supplemental tones [6,7]. Nonetheless, the procedure of pilot tone insertion increases the system complexity.…”

Section: Introductionmentioning

confidence: 99%

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Self-Pilot Tone Based Adaptive Threshold RZ-OOK Decision for Free-Space Optical Communications

Hong

2023

Photonics

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This paper studies a novel self-pilot tone based adaptive threshold return-to-zero on-off keying (RZ-OOK) decision for free-space optical (FSO) communications. RZ-OOK has the characteristics of impulse series in the spectrum. Therefore, these impulses can be utilized as the pilot tones of the transmitted signal to convey the channel state information (CSI) of FSO links. Then, the CSI signal is extracted using a local oscillator (LO) with the frequencies of the impulse series and low pass filter. Finally, the adaptive threshold decision (ATD) is realized by assigning optimized weight factors into the extracted CSI signal. The proposed adaptive threshold RZ-OOK decision was studied in simulation under various pulse durations of RZ-OOK signal and frequencies of LO. Simulation results demonstrated that RZ-OOK with the proposed impulse tone-extracted CSI signal under optimized weight factor performs close to the conventional ATD under precise CSI knowledge.

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Section: Simulations and Resultsmentioning

confidence: 99%

Section: Operation Principlementioning

confidence: 99%