Combined transmission of PPM and WSK modulated optical signal over free space optical link enabling physical layer security

Faria,; Mirza, Jawad; Aljohani, Abdulah Jeza; Ijaz, Muhammad; Ghafoor, Salman

doi:10.1016/j.ijleo.2024.171748

Cited by 3 publications

References 21 publications

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Unravelling the electrochemical impedance spectroscopy of hydrogenated amorphous silicon cells for photovoltaics

Prayogi,

Ristiani,

2024

Phys. Scr.

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This research reveals the application of electrochemical impedance spectroscopy (EIS) in analyzing and improving the performance of hydrogenated amorphous silicon (a-Si: H) based photovoltaic cells. As a non-destructive technique, EIS provides deep insight into the electrochemical characteristics of photovoltaic cells, including series resistance, layer capacitance, recombination mechanisms, and charge transport. The impedance data is obtained and analyzed using small AC potential signals at various frequencies via Nyquist diagrams and Bode plots. This analysis allows the identification of resistive and capacitive elements as well as the evaluation of the quality of the interface between the active layer and the electrode. The results show that EIS can identify internal barriers that reduce the efficiency of a-Si: H solar cells, such as dominant recombination mechanisms and inefficient charge transport. Using equivalent circuit models, electrochemical parameters are extracted to reveal cell behavior and performance. In addition, these results also confirm that EIS is an important tool in design optimization and performance improvement of a-Si: H photovoltaic cells, providing a solid scientific basis for the development of more efficient and sustainable solar cell technology. These findings contribute to efforts to increase solar energy efficiency, supporting broader and more effective use of photovoltaic technology in meeting global sustainable energy needs.

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Unravelling the electrochemical impedance spectroscopy of hydrogenated amorphous silicon cells for photovoltaics

Prayogi,

Ristiani,

2024

Phys. Scr.

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Single laser based novel wavelength shift keying scheme for ground to satellite bidirectional links

Faria,

Ghafoor,

Mirza

et al. 2024

Phys. Scr.

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Laser communication in space is gaining more recognition due to its ability to provide a much broader and unregulated data transmission capacity compared to traditional radio frequency systems, while also significantly decreasing the size, power requirements, and weight of the communication system. In this work, a novel technique for the generation of a wavelength shift keying (WSK) signal for the bidirectional transmission of 10 Gbps data between the ground station and low Earth orbit (LEO) satellite is presented. Our proposed scheme requires a single laser source to transmit WSK signal, that generally requires two wavelength sources to transmit the binary data bits. Furthermore, the scheme allows us to remodulate the optical signal received at the LEO satellite for downlink signal transmission. Therefore, the requirement of a laser source at the LEO satellite is eliminated, achieving the much desirable goals of low power consumption, weight and cost. The free space optical (FSO) channel is modelled using the gamma-gamma channel model. The performance of the proposed link is also compared with a conventional On-Off keying (OOK) based modulation scheme by using bit-error-rate (BER) as the performance metric.

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A Relay-Assisted Ground to LEO and LEO to GEO Inter-Satellite Optical Wireless Communication Link

Faria,

Ahmad,

Ghafoor

2024

2024 International Conference on Electrical, Computer and Energy Technologies (ICECET

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Combined transmission of PPM and WSK modulated optical signal over free space optical link enabling physical layer security

Cited by 3 publications

References 21 publications

Unravelling the electrochemical impedance spectroscopy of hydrogenated amorphous silicon cells for photovoltaics

Unravelling the electrochemical impedance spectroscopy of hydrogenated amorphous silicon cells for photovoltaics

Single laser based novel wavelength shift keying scheme for ground to satellite bidirectional links

A Relay-Assisted Ground to LEO and LEO to GEO Inter-Satellite Optical Wireless Communication Link

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