Spatial Domain Isolation

Technical Explanation

Passive spatial isolation reduces the workload of active analog and digital cancellation. By physically separating transmit and receive sub-arrays on the gNodeB mast, employing orthogonal cross-polarization (+45° / -45°), and applying digital beamforming weight constraints that place nulls toward local receiver antenna elements, base stations achieve 30 to 45 dB of passive self-interference reduction.

Key Functions

• Exploits physical distance and electromagnetic shielding between antenna panels
• Utilizes orthogonal cross-polarized array elements for transmit and receive paths
• Calculates digital beamforming precoding weights that inject spatial nulls toward local receivers
• Reduces complexity, power consumption, and dynamic range strain on analog cancellation circuits