Diversity scheme based hybrid FSO/RF systems in satellite-aerial-ground integrated network with outdated CSI

Area of Science:

• Wireless Communication Networks
• Optical Wireless Communication
• Satellite Communication Systems

Background:

• Satellite-aerial-ground integrated networks (SAGIN) face performance degradation due to weather-induced impairments and signal attenuation.
• Existing solutions often struggle to adapt to dynamic weather conditions and imperfect channel state information (CSI).

Purpose of the Study:

• To propose a novel weather-dependent hybrid free-space optical (FSO) and radio frequency (RF) switching scheme for SAGIN.
• To enhance the reliability and performance of SAGIN under adverse weather conditions and with outdated CSI.

Main Methods:

• Design of three distinct working modes and two diversity schemes within the hybrid FSO/RF framework.
• Performance evaluation using key metrics: outage probability (OP), average bit-error rate (BER), and ergodic capacity (EC).
• Derivation of asymptotic results for high signal-to-noise ratio (SNR) and perfect CSI scenarios.

Main Results:

• The proposed hybrid FSO/RF switching scheme demonstrates significant performance gains.
• Achieved over 8.8 dB improvement in outage probability (OP).
• Achieved over 8.1 dB improvement in average bit-error rate (BER).

Conclusions:

• The developed weather-dependent hybrid FSO/RF scheme effectively mitigates weather-induced impairments in SAGIN.
• The scheme offers a robust solution for improving communication reliability and performance in challenging environmental conditions.
• The findings provide valuable engineering insights for the design of resilient integrated networks.