Demo abstract: Millimeter-Wave Sub-Arrays for Joint Communications and Interference Suppression

We demonstrate mmSubarray, a novel millimeter-wave sub-band phased array system designed to combat interference and maximize spectrum utilization in mmWave networks. Traditional approaches, such as frequency separation and beam nulling, often lead to spectrum under-utilization or coverage gaps. mmSubarray overcomes these limitations by splitting the spectrum into overlapping and non-overlapping sub-bands, assigning non-overlapping bands to interference-prone directions while using overlapping bands to support other directions. It dynamically allocates sub-bands across multiple beams and employs interference nulling to suppress interference below the noise floor. We built a prototype of mmSubarray using commercially available phased arrays and software-defined radio (SDR). Our experimental results show that the system significantly enhances network efficiency, ensuring robust and reliable communication links without sacrificing spectrum or coverage.