突破全双工的极限：设计与实时的实现
Pushing the limits of Full-duplex: Design and Real-time Implementation
摘要：
最近的工作已经表明了单信道全双工无线物理层的可行性，允许节点在同一时间在同一频带发送和接收。在本报告中，我们首先设计并实作一个实时的【形】64副载波10 MHz全双工正交分频多工物理层，FD-PHY。所提出的FD-PHY不仅允许同步全双工传输，而且还允许选择性的异步全双工模式。此外，我们表明，在实际设备上使用最佳天线放置的空中实验中，自干扰可以被抑制高达80 dB，这比先前报道的结果多10 dB。然后，我们提出了一个全双工的MAC协议，FD-MAC，它建立在IEEE 802.11的三个新机制-共享随机退避，头侦听和虚拟退避。新机制允许FD-MAC以分布式方式发现和利用全双工机会。我们的无线测试显示，在实际使用情况下，使用全双工比使用半双工的吞吐量提高了70%以上。
英文摘要：
Recent work has shown the feasibility of single-channel full-duplex 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 full-duplex 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 full-duplex opportunities in a distributed manner. Our over-the-air tests show over 70% throughput gains from using full-duplex over half-duplex in realistically used cases.
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