Practical, real-time, full duplex wireless
Practical, real-time, full duplex wireless
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DOI：
10.1145/2030613.2030647
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发表时间：
2011-09
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通讯作者：
Mayank Jain;J. Choi;T. Kim;Dinesh Bharadia;S. Seth;K. Srinivasan;P. Levis;S. Katti;P. Sinha-P.-Sin
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文献类型：
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作者：
Mayank Jain;J. Choi;T. Kim;Dinesh Bharadia;S. Seth;K. Srinivasan;P. Levis;S. Katti;P. Sinha-P.-Sin
本文使用信号倒置和自适应取消提出了完整的双工无线电设计。信号反演使用基于平衡/不平衡（Balun）变压器的简单设计。与先前的工作不同，这种新设计支持宽带和高功率系统。从理论上讲，这种新设计对带宽或力量没有限制。在实践中，我们发现单独的信号反转技术可以在40MHz带宽中取消至少45dB。此外，对于10MHz OFDM信号，将信号反转取消与取消的取消相结合可以减少73DB。本文还提供了完整的双工中型访问控制（MAC）设计，并使用5个原型完整双工节点的测试床进行评估。由于隐藏的终端导致的数据包损失最多88％。完整的双工还可以减轻基于AP的网络中不公平的通道分配，将公平性从0.85增加到0.98，同时将下行链接吞吐量提高了110％，上行链路吞吐量提高了15％。这些实验结果表明，无线网络堆栈的重新设计以利用完整的双链功能，可以显着改善网络性能。
This paper presents a full duplex radio design using signal inversion and adaptive cancellation. Signal inversion uses a simple design based on a balanced/unbalanced (Balun) transformer. This new design, unlike prior work, supports wideband and high power systems. In theory, this new design has no limitation on bandwidth or power. In practice, we find that the signal inversion technique alone can cancel at least 45dB across a 40MHz bandwidth. Further, combining signal inversion cancellation with cancellation in the digital domain can reduce self-interference by up to 73dB for a 10MHz OFDM signal. This paper also presents 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%. Full duplex 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 re- design of the wireless network stack to exploit full duplex capability can result in significant improvements in network performance.