Channel Model and Performance Analysis for MIMO Systems with Single Leaky Coaxial Cable in Tunnel Scenarios

Area of Science:

• Wireless Communication Engineering
• Electromagnetics
• Channel Modeling

Background:

• Tunnel environments present spatial constraints for wireless systems.
• Traditional Multiple-Input Multiple-Output (MIMO) systems face challenges in limited spaces.
• Leaky coaxial cables (LCXs) offer potential for improved coverage and capacity in confined areas.

Purpose of the Study:

• To propose and validate a novel MIMO channel model utilizing double-port fed LCXs specifically for tunnel environments.
• To analyze the channel capacity distribution of LCX-MIMO systems under varying LCX lengths.
• To compare the performance of LCX-MIMO systems against traditional dipole antenna MIMO systems in tunnels.

Main Methods:

• Development of a MIMO channel model for double-port fed LCXs based on Geometry Based Single Bounce (GBSB) and LCX electromagnetic radiation theory.
• Derivation and verification of the Channel Impulse Response (CIR) using measurement data.
• Analysis of channel capacity distributions for different LCX lengths and prediction for longer LCXs.

Main Results:

• The proposed double-port fed LCX-MIMO channel model accurately represents tunnel environments.
• Channel capacity distributions were analyzed for various LCX lengths, with predictions for long LCXs.
• The LCX-MIMO system demonstrated superior channel capacity compared to dipole antenna MIMO systems in the studied tunnel scenarios.

Conclusions:

• Double-port fed LCXs offer a viable solution for enhancing MIMO system performance in space-limited tunnel environments.
• The developed channel model provides a valuable tool for designing and optimizing wireless communication systems in tunnels.
• LCX-MIMO systems represent a significant advancement over traditional antenna-based MIMO systems for tunnel applications.