Asynchronous Non-Orthogonal Multiple Access (ANOMA)

Abstract: Non-orthogonal multiple access (NOMA) is one of the key potential technologies to meet the challenges of the next generation wireless communications. NOMA allows different users to share the same time and frequency resources. In this talk, we introduce asynchronous NOMA (ANOMA) and study the benefits of intentionally adding symbol-level timing mismatch in both downlink and uplink NOMA. We analyze the rate-region provided by the asynchronous transmission and derive the corresponding theoretical capacity-regions for a wide range of pulse shaping methods. Our analysis shows that asynchronous transmission enlarges the rate-region. Furthermore, we provide practical transceiver designs that can achieve a rate pair that is not achievable by the synchronous transmission. We also apply ANOMA principles in different scenarios including multiuser transmit beamforming, systems with limited feedback, and cooperative communication to name a few.