Relay Positions Considering Interference from Other Sub-Channels in OFDMA-Based D2D Group-Casting Systems

Area of Science:

• Wireless Communication
• Signal Processing

Background:

• Device-to-device (D2D) communication offers improved spectrum efficiency, reduced delay, and lower power consumption compared to traditional cellular networks.
• Orthogonal frequency-division multiple access (OFDMA) is commonly used in D2D systems for efficient frequency resource allocation.
• In-band emissions in D2D systems can cause interference between sub-channels, degrading performance.

Purpose of the Study:

• To investigate the performance degradation in OFDMA-based D2D group-casting systems due to inter-sub-channel interference.
• To determine the optimal relay position that minimizes outage probability in D2D overlay systems.
• To analyze the impact of source location and target scenario on relay placement.

Main Methods:

• Theoretical analysis of interference in D2D overlay systems using OFDMA.
• Simulation of three D2D relay scenarios.
• Mathematical derivation to find the relay position minimizing outage probability.

Main Results:

• Interference from other sub-channels significantly impacts OFDMA-based D2D group-casting performance.
• The optimal relay position is highly dependent on the source device's location.
• Different target scenarios necessitate distinct relay placements for optimal performance.

Conclusions:

• Interference management is crucial for robust D2D communication performance.
• Relay placement optimization is essential for mitigating interference and improving D2D system reliability.
• The findings provide valuable insights for designing efficient D2D communication systems.