Received response based heuristic LDPC code for short-range non-line-of-sight ultraviolet communication

Area of Science:

• Optical Communications
• Wireless Communication Systems
• Signal Processing

Background:

• Short-range non-line-of-sight (NLOS) ultraviolet (UV) communication faces challenges from scattered propagation and random detection.
• Inter-symbol interference (ISI) significantly impacts data rates in UV communication systems.
• Photon multiplier tube (PMT) receiver statistics are crucial for accurate modeling.

Purpose of the Study:

• To develop a generalized received response model for NLOS UV communication.
• To investigate the impact of ISI on link data rate.
• To propose an efficient coding scheme for improved performance.

Main Methods:

• Modified photon multiplier tube (PMT) receiver output statistics to create a generalized response model.
• Incorporated scattered propagation and random detection effects into the model.
• Developed a heuristic check matrix construction algorithm for low-density-parity-check (LDPC) codes.
• Utilized numerical simulations validated against experimental results.

Main Results:

• The generalized model accurately reflects experimental UV communication link performance.
• A novel LDPC code construction algorithm was proposed.
• The proposed LDPC coding approach improved bit error ratio (BER) performance.
• Achieved BER below 1E-05 at a data rate of 2Mbps in short-range NLOS UV systems.

Conclusions:

• The developed response model effectively captures the complexities of NLOS UV communication.
• The proposed LDPC coding strategy significantly enhances BER performance.
• This research offers a pathway to higher data rates and reliability in short-range UV communication.