Recent work has shown the feasibility of single-channel fullduplex wireless physical layer, allowing nodes to send and receive in the same frequency band at the same time. In this report, we first design and implement a real-time 64-subcarrier 10 MHz full-duplex OFDM physical layer, FD-PHY. The proposed FD-PHY not only allows synchronous full-duplex transmissions but also selective asynchronous fullduplex modes. Further, we show that in over-the-air experiments using optimal antenna placement on actual devices, the self-interference can be suppressed upto 80dB, which is 10dB more than prior reported results. Then we propose a full-duplex MAC protocol, FD-MAC, which builds on IEEE 802.11 with three new mechanisms -shared random backoff, header snooping and virtual backoffs. The new mechanisms allow FD-MAC to discover and exploit fullduplex opportunities in a distributed manner. Our over-theair tests show over 70% throughput gains from using fullduplex over half-duplex in realistically used cases.
Sahai et al. proposed a full-duplex MAC (FD-MAC) protocol to evenly provide transmission opportunities and reduce collision probability REF .
Pushing the limits of Full-duplex: Design and Real-time Implementation
ArXiv
ArXiv
Computer Science