Side Channel: Bits over Interference
Side Channel: Bits over Interference
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DOI：
10.1145/1859995.1859998
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发表时间：
2010-09
影响因子：
7.9
通讯作者：
Kaishun Wu;Haoyu Tan;Yunhuai Liu;Jin Zhang;Qian Zhang;L. Ni
中科院分区：
文献类型：
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作者：
Kaishun Wu;Haoyu Tan;Yunhuai Liu;Jin Zhang;Qian Zhang;L. Ni
干扰是无线通信中的关键问题。在典型的多用户环境中，不同的用户可能会严重地相互干扰。因此，用户之间的协调是无线网络中干扰管理不可或缺的部分。众所周知，多个节点之间的协调是一个昂贵的操作，需要大量的有价值的通信资源。在本文中，我们有一个有趣的观察，通过生成预期的模式，一些同时传输，即，“干扰”，可以成功地解码，而不会降低原始传输中的有效吞吐量。因此，可以建立一个额外的和“免费”的协调渠道。基于这个想法，我们提出了一个DC-MAC利用这个“自由”的渠道，在多用户无线网络中的高效介质访问。我们从理论上分析了该信道在不同环境下的容量与各种调制方案。基于USRP 2的实现实验表明，与广泛采用的CSMA相比，DC-MAC可以将信道利用率提高250%。
Interference is a critical issue in wireless communications. In a typical multiple-user environment, different users may severely interfere with each other. Coordination among users therefore is an indispensable part for interference management in wireless networks. It is known that coordination among multiple nodes is a costly operation taking a significant amount of valuable communication resource. In this paper, we have an interesting observation that by generating intended patterns, some simultaneous transmissions, i.e., "interference,” can be successfully decoded without degrading the effective throughput in original transmission. As such, an extra and "free” coordination channel can be built. Based on this idea, we propose a DC-MAC to leverage this "free” channel for efficient medium access in a multiple-user wireless network. We theoretically analyze the capacity of this channel under different environments with various modulation schemes. USRP2-based implementation experiments show that compared with the widely adopted CSMA, DC-MAC can improve the channel utilization efficiency by up to 250 percent.