Polar-UEP spinal concatenated encoding in free-space optical communication

Area of Science:

• Optical Communications
• Coding Theory
• Information Theory

Background:

• Spinal codes exhibit poor bit error rate (BER) performance in free-space optical (FSO) communication systems.
• Existing coding schemes may not adequately protect critical information bits against channel impairments.

Purpose of the Study:

• To propose a novel polar-UEP (unequal error protection) spinal concatenated coding scheme for FSO communication.
• To enhance the BER performance of spinal codes by leveraging polar code characteristics.

Main Methods:

• Combining unequal error protection of spinal codes with the construction of polar codes.
• Utilizing bit sorting and interleaving techniques for optimized data protection.
• Simulating the proposed scheme under varying turbulence intensities.

Main Results:

• The polar-UEP spinal concatenated code demonstrates superior BER performance for both important and less important bits compared to standard spinal codes.
• Achieved a 0.7 dB-1.2 dB gain at a BER of 10^-4 compared to fixed-rate polar codes under 0.1 turbulence intensity.
• Exhibited lower BER across different turbulence intensities than both spinal and polar codes.

Conclusions:

• The proposed polar-UEP spinal concatenated code offers a viable solution for improving spinal code efficiency in FSO communication.
• This scheme effectively enhances data reliability in optical communication systems facing channel impairments.