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Performance analysis of polar-coded FSO systems using turbulence-oriented rotational probabilistic shaping.

Xiaoyu Liu, Zhiyang Liu, Weiying Yang

|November 22, 2024

Summary

A new turbulence-oriented rotated probabilistic shaping (TRPS) scheme boosts free-space optical (FSO) communication rates. This method enhances performance in high signal-to-noise ratio (SNR) conditions, even with increasing atmospheric turbulence.

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Area of Science:

Optical communications
Wireless communication systems
Signal processing

Background:

Free-space optical (FSO) systems offer high speed and capacity but are challenged by atmospheric turbulence.
Existing methods struggle to maintain performance under varying turbulence intensities.

Purpose of the Study:

To introduce a novel turbulence-oriented rotated probabilistic shaping (TRPS) scheme for FSO systems.
To enhance achievable rates and improve error performance in turbulent FSO channels.

Main Methods:

Developed a TRPS scheme optimizing probabilities and rotation angles for joint coding, shaping, and signal space diversity gains.
Derived and verified the non-equivalent pairwise error probability as an upper bound for average symbol error rate (ASER).
Utilized polar codes for post-forward error correction bit error rate (BER) simulations.

Main Results:

TRPS significantly enhances achievable rates in high SNR regions with increasing turbulence.
Achieved rate increases of 0.08 to 0.23 bits per symbol (b/s) compared to non-rotated 16-ary quadrature amplitude modulation (16QAM).
TRPS demonstrated joint gains of over 11.5 dB in ASER and 3 dB in BER for 16QAM and 32QAM under strong turbulence.

Conclusions:

The TRPS scheme theoretically and practically validates its superiority in FSO systems.
TRPS effectively mitigates atmospheric turbulence effects, improving overall system performance.
The proposed scheme shows significant potential for robust and high-performance FSO communication.