Issue No. 08 - Aug. (2012 vol. 11)
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/TMC.2011.158
Qian Zhang , The Hong Kong University of Science and Technology, Hong Kong
Jin Zhang , The Hong Kong University of Science and Technology, Hong Kong
Yunhuai Liu , Chinese Academy of Sciences, Hong Kong
Haoyu Tan , The Hong Kong University of Science and Technology, Hong Kong
Kaishun Wu , The Hong Kong University of Science and Technology, Guangzhou, and Sun Yat-sen University, Hong Kong
Lionel M. Ni , The Hong Kong University of Science and Technology, Hong Kong
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.
Interference, Wireless networks, Receivers, Channel capacity, Synchronization, Throughput, Multiaccess communication, coordination., Wireless network, interference
Q. Zhang, J. Zhang, Y. Liu, H. Tan, K. Wu and L. M. Ni, "Side Channel: Bits over Interference," in IEEE Transactions on Mobile Computing, vol. 11, no. , pp. 1317-1330, 2012.