Abstract
The importance of free-space optical (FSO) communication has increased during the last decade, introducing its unique features such as its high data rate, license-free spectrum, ease of deployability, and low power consumption. In the future, communication between low earth orbit (LEO) and geostationary earth orbit (GEO) satellites will be commonly established by using inter-satellite optical wireless communication (IsOWC) systems. That enables GEO satellites to relay information to and from LEO satellites and fixed Earth stations that otherwise cannot transmit/receive data permanently. IsOWC systems are the most effective application of the FSO, and they will be favorited shortly because of their features. In this work, we established an IsOWC between GEO and LEO satellites at a distance of 45000 km to achieve a target bit error rate (BER) equal to 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−6</sup> . Furthermore, we proposed an IsOWC system with suitable operating wavelengths. Physical techniques such as the multi-input multi-output (MIMO) technique and a wave division multiplexing (WDM) technique are employed.
Highlights
F OR a long time ago, the need for transferring messages between two points with a reliable, secure, and fast method of transmitting messages was on top of importance
The aim is to enhance the intersatellite optical wireless communication (IsOWC) performance in terms of Q factor and Bit error rate and achieve a data rate higher than the data rate of 1.8 Gbps achieved in the European Data Relay Satellites (EDRS)-C satellite launched in late 2019 by European Space Agency (ESA) and Airbus [23]
We assumed the pointing error angles value to be 0.75 μrad, the transmitter and the receiver efficiency equal to 90%, and apertures diameter equal to 30 cm (1/10 of the aperture size required in case of radio frequency (RF) signal) to improve Q factor and bit error rate (BER) at 45000 km distance [8], [14]
Summary
F OR a long time ago, the need for transferring messages between two points with a reliable, secure, and fast method of transmitting messages was on top of importance. Multiple input multiple output techniques (MIMO) is a method that utilizes a set of antennas for transmitting and receiving signals at each end of an optical link for multiplying the capacity, using multiple transmission and reception to exploit multipath propagation. It is one of the Diversity techniques utilized in wireless communication systems to enhance performance and increase resilience, reliability, and data rate over wireless channels [15]. Optical MIMO and Radio Frequency (RF) MIMO systems almost have equivalent performance It increases the channel capacity of the system linearly with the number of transmitting antennas. The WDM technique is employed to enhance the IsOWC Q factor
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