Performance Analysis of DPSK Optical Communication for LEO-to-Ground Relay Link Via a GEO Satellite

Abstract

Satellite optical communication has gained significant attention owing to its many quality features (e.g., a larger bandwidth, license free spectrum, higher data rate, and better security) compared to satellite microwave communication. Various experiments have been performed during many space missions to demonstrate and characterize inter-satellite links, downlinks, and uplinks. Korea has also planned to establish an experimental communication system using a geostationary earth orbit (GEO) satellite and the Geochang station as an optical ground station for low Earth orbit (LEO)-to-ground optical relay links. In this study, the performance of inter-satellite communication links and downlinks was investigated for the new Korean experimental communication system in terms of link margin, bit error rate (BER), and channel capacity. In particular, the performance of the inter-satellite links was analyzed based on the receiving apertures and the transmitting power, while that of the downlink was analyzed in terms of atmospheric turbulence conditions and transmitting power. Finally, we discussed two system parameters of receiving aperture and transmitting power to meet the three criteria of link margin, BER, and channel capacity.

Latency Versus Transmission Power Trade-Off in Free-Space Optical (FSO) Satellite Networks With Multiple Inter-Continental Connections

“…For optical uplink and downlink in an FSOSN, we consider Mie scattering and geometrical scattering to model atmospheric attenuation. The transmission power P T for optical uplink and downlink is given by [38]…”

Performance Analysis of M-ary Optical Communication over Log-Normal Fading Channels for CubeSat Platforms

“…The link equation is a fundamental and useful tool to predict the channel performance of the optical communication system, since it provides a key to the system design and component selection. The link equation represents the relationship between the transmitting optical power (P T ) and the received optical power (P R ) at the input to the optical detector, and then enables to analyze the trade-offs between system parameters and link performance (Lim et al 2020a). Taking into account no atmospheric turbulence, the link equation is expressed by:…”

“…The one-way atmospheric transmittance, T A and T C , due to the atmospheric constituents and cirrus clouds are expressed as (Degnan 1993;Lim et al 2020a):…”

“…A major impairment over optical downlinks and uplinks is atmospheric turbulence which causes fluctuations in both intensity and phase of the received signals. Based on scintillation statistics, various fading channel models have been proposed such as log-normal, K channel, Gamma-Gamma, and negative exponential models (Lim et al 2020a). The log-normal model is suitable for weak turbulence which is characterized by a scintillation index ( 2 si σ ) less than 0.75.…”

“…The Hufnagel-Valley model has been widely used for satellite optical communications due to its simplicity and relative accuracy. In addition, it allows an easy variation of the daytime and nighttime profile by varying various site parameters like wind speed, isoplanatic angle and attitude (Kaushal & Kaddoum 2017;Lim et al 2020a…”