研究目的
Investigating the performance of transmission techniques on the fixed‐gain amplify‐and‐forward–based asymmetric radio frequency/free space optical (RF/FSO) communication system over Nakagami‐m and gamma‐gamma fading channels with pointing errors.
研究成果
The study concludes that both atmospheric turbulence and pointing error significantly degrade the system performance, with the MRT transmission technique offering better performance compared to OSTBC under the same conditions. The analytical results are validated by Monte‐Carlo simulations.
研究不足
The study is theoretical and does not account for all possible real-world variations in atmospheric conditions and pointing errors. The performance analysis is limited to the specific models and techniques considered.
1：Experimental Design and Method Selection:
The study involves modeling the RF link by Nakagami‐m fading channels and the FSO link by Gamma‐Gamma fading channels under the effect of zero boresight and non‐zero boresight pointing errors. Maximum ratio transmission (MRT) and orthogonal space‐time block coding (OSTBC) techniques are considered at the system source, with selection combining used for reception at the relay and destination.
2：Sample Selection and Data Sources:
The study utilizes theoretical models and simulations to analyze the system's performance under various conditions.
3：List of Experimental Equipment and Materials:
The analysis is based on theoretical models and does not specify physical equipment.
4：Experimental Procedures and Operational Workflow:
The study derives a unified cumulative density distribution (CDF) of end‐to‐end signal‐to‐noise ratio for the system and uses this to obtain closed‐form expressions for the outage probability and average bit error rate for M‐ary phase shift keying modulation.
5：Data Analysis Methods:
The accuracy of the analytical results is verified by Monte‐Carlo simulations.
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