Full-duplex wireless adaptive tuning techniques

Stanford researchers have invented techniques to adaptively tune the operation of a wireless full-duplex node. To enable full-duplex operation, the receiver circuit needs to be able to cancel the transmitter's signal in order to receive data from other nodes.
The two components of the self-interference cancellation system are 1) Cancellation in the Radio Frequency and 2) Cancellation in Digital Samples.
This invention implements adaptive techniques for both components of the full-duplex design to make the design practically implementable.

Stage of Research:
This method has been evaluated using a 5 prototype testbed for a 10MHz wide OFDM signal. In this evaluation, full-duplex reduces packet losses due to hidden terminals by up to 88%. It also mitigates unfair channel allocation in AP-based networks, increasing fairness from 0.85 to 0.98 while improving downlink throughput by 110% and uplink throughput by 15%. These experimental results show that a redesign of the wireless network stack to exploit full-duplex capability can result in significant improvements in network performance.