September 19–23, 2011, Las Vegas, Nevada, USA | Mayank Jain1†, Jung II Choi1†, Tae Min Kim1, Dinesh Bharadia1, Siddharth Seth1, Kannan Srinivasan2, Philip Levis1, Sachin Katti1, Prasun Sinha3
This paper presents a full-duplex radio design using signal inversion and adaptive cancellation, which supports wideband and high-power systems. The design, based on a balanced/unbalanced (Balun) transformer, can cancel at least 45dB across a 40MHz bandwidth and reduce self-interference by up to 73dB for a 10MHz OFDM signal. The paper also introduces a full-duplex medium access control (MAC) design and evaluates it using a testbed of 5 prototype full-duplex nodes. Full-duplex reduces packet losses due to hidden terminals by up to 88% and improves channel allocation fairness from 0.85 to 0.98, while increasing downlink throughput by 110% and uplink throughput by 15%. The experimental results demonstrate significant improvements in network performance when the wireless network stack is redesigned to exploit full-duplex capability.This paper presents a full-duplex radio design using signal inversion and adaptive cancellation, which supports wideband and high-power systems. The design, based on a balanced/unbalanced (Balun) transformer, can cancel at least 45dB across a 40MHz bandwidth and reduce self-interference by up to 73dB for a 10MHz OFDM signal. The paper also introduces a full-duplex medium access control (MAC) design and evaluates it using a testbed of 5 prototype full-duplex nodes. Full-duplex reduces packet losses due to hidden terminals by up to 88% and improves channel allocation fairness from 0.85 to 0.98, while increasing downlink throughput by 110% and uplink throughput by 15%. The experimental results demonstrate significant improvements in network performance when the wireless network stack is redesigned to exploit full-duplex capability.