Orthogonal Space-Time Block Coding for Double Scattering V2V Links with LOS and Ground Reflections.

Area of Science:

• Wireless Communications
• Signal Processing
• Vehicular Technology

Background:

• Vehicle-to-vehicle (V2V) communication systems face challenges from fast-fading channels.
• Impairments like ground reflections and high Doppler frequencies significantly impact V2V MIMO performance.
• Existing diversity schemes may be insufficient in dynamic vehicular environments.

Purpose of the Study:

• To analyze the performance of space-time block codes (STBCs) in V2V fast-fading channels.
• To investigate the influence of deterministic ground reflections and increased Doppler frequency on V2V MIMO systems.
• To evaluate the effectiveness of STBCs in mitigating self-interference and deep fades in vehicular environments.

Main Methods:

• Performance analysis of STBCs with varying coding rates using an approximation model.
• Modeling of V2V channels with antenna elements distributed on two vehicles.
• Utilizing a multi-ray model for ground reflection interference and a double scattering model for Doppler effects.

Main Results:

• STBCs effectively counteract signal fades caused by self-interference across various inter-vehicle distances and Doppler frequencies.
• STBCs demonstrate superior performance in deep fades compared to receive diversity alone, even with orthogonality loss in time-varying channels.
• Higher-order STBCs show gains, especially with multiple antenna receivers, even at lower coding rates.

Conclusions:

• STBCs are a viable solution for improving reliability in V2V communications under challenging channel conditions.
• Transmit diversity using STBCs can be effectively exploited in time-varying vehicular channels with modified line-of-sight.
• The findings provide insights for optimizing V2V system design considering channel impairments and diversity techniques.