Prototyping NOMA Constellation Rotation in Wi-Fi

Non-orthogonal multiple access (NOMA) is a promising technique for improving the performance of Wi-Fi networks. With NOMA, a Wi-Fi access point may simultaneously transmit several flows. However, the ability of the NOMA devices to recover their frames depends on how the signals are multiplexed. In this demo, we extend our previously designed NOMA Wi-Fi prototype to enable constellation rotation. This feature can combat the phase noise, a detrimental effect for NOMA signals. We experimentally study constellation rotation and prove that it makes NOMA signal reception more robust compared to traditional NOMA(1).