A QoS-Adaptive Interference Alignment Technique for In-Band Full-Duplex Multi-Antenna Cellular Networks

Area of Science:

• Wireless communication networks
• Signal processing for wireless communications
• Information theory

Background:

• In-band full-duplex (IBFD) technology enables simultaneous transmission and reception.
• Existing IBFD MIMO cellular networks face cross-link interference (CLI) challenges.
• Half-duplex (HD) systems have limitations in spectral efficiency.

Purpose of the Study:

• To propose a novel interference alignment (IA) technique for IBFD MIMO cellular networks.
• To mitigate cross-link interference (CLI) in networks with a full-duplex base station and half-duplex user equipment.
• To adapt the IA schemes based on quality-of-service (QoS) requirements.

Main Methods:

• Development of two symmetric IA schemes tailored to antenna configurations.
• Theoretical characterization and proof of achievable sum-degrees-of-freedom (DoF).
• Adaptive application of IA schemes based on uplink and downlink traffic demands.

Main Results:

• The proposed IA technique effectively mitigates CLI in IBFD MIMO networks.
• Achievable sum-degrees-of-freedom (DoF) is theoretically proven.
• Simulation results demonstrate significant sum rate improvement over conventional HD multi-user MIMO.

Conclusions:

• The novel IA technique offers a viable solution for enhancing performance in IBFD MIMO cellular networks.
• The proposed method achieves performance comparable to interference-free IBFD MIMO systems.
• Adaptive IA schemes provide flexibility to meet diverse QoS demands.