Demonstration of Spatial Modulation Using a Novel Active Transmitter Detection Scheme with Signal Space Diversity in...

Area of Science:

• Optical Wireless Communications (OWC)
• Wireless Communication Systems
• Signal Processing

Background:

• Line-of-sight (LOS) indoor OWC offers high data rates but is susceptible to obstructions.
• Diversity techniques can mitigate performance degradation from channel obstructions, but channel gains vary.
• Spatial Modulation (SM) is a technique used in OWC to improve system performance.

Purpose of the Study:

• To propose a novel active transmitter detection scheme for spatial modulation (SM) integrated with signal space diversity (SSD).
• To enhance optical wireless communication (OWC) system throughput and bit-error-rate (BER).
• To address limitations in power-based transmitter detection for SM using complex modulation waveforms.

Main Methods:

• Developed an active transmitter detection scheme combining signal pre-distortion at the transmitter and statistical detection at the receiver.
• Integrated this scheme with signal space diversity (SSD) in an OWC system.
• Investigated performance under varying constellation rotation angles and channel gain distributions.

Main Results:

• Achieved approximately 0.61 dB signal-to-noise-ratio (SNR) improvement with the proposed scheme.
• Demonstrated potential for an improved data rate of approximately 7.5 Gbit/s.
• Validated effective transmitter detection for SSD, enhancing system performance.

Conclusions:

• The proposed scheme offers a practical solution for power-based SM implementation in OWC.
• Effective transmitter detection facilitates the realization of SSD for improved system throughput and BER.
• This work advances high-speed indoor OWC by enhancing reliability and data rates.