802.11n与ZigBee共存:子载波置零多输入多输出物理层模型

发布时间：2018-03-29 05:23

本文选题：多输入多输出　切入点：Zig　出处：《计算机应用》2014年12期

【摘要】：针对802.11n与Zig Bee共享ISM频段造成的Wi Fi与Zig Bee信道重叠,进而导致网络间相互干扰使得网络性能下降,以及当前载波侦听多路访问/冲突避免(CSMA/CA)可能导致的频谱资源利用率较低的问题,提出一个采用子载波置零技术的2×2非相干多输入多输出(MIMO)物理层模型。该模型中,为了避免共信道干扰,Wi Fi发送端在发送数据前首先对其当前使用的信道中可能存在的Zig Bee信号进行检测,若检测到Zig Bee信号则对已被占用的频谱对应的子载波置零,使用余下频谱不重叠子载波进行通信。接收端对发送端使用的子载波进行识别,并完成后续工作。通过使Wi Fi与Zig Bee信号频谱分离来消除信号间干扰,解决两者共存问题,实现Wi Fi与Zig Bee数据并行传输。在由GNURadio/USRP软件无线电设备和Zig Bee节点搭建的实验床上进行的实验结果表明,采用子载波置零技术的2×2非相干MIMO可以获得全带宽发送状态下50%~70%的吞吐量,同时在数据并行传输过程中Zig Bee的正确收包百分比达到90%以上。
[Abstract]:In view of the overlap of Wi-Fi and Zig Bee channel caused by 802.11n and Zig Bee sharing ISM band, the network performance is degraded by the interference between the two networks. As well as the problem of low spectrum resource utilization caused by current carrier listening multiplexing access / collision avoidance (CSMA / CAA), a 2 脳 2 incoherent multiple input multiple output (MIMOM) physical layer model using subcarrier zeroing technique is proposed. In this model, a 2 脳 2 incoherent multiple input multiple output (MIMOO) physical layer model is proposed. In order to avoid the co-channel interference, the Wi Fi transmitter detects the Zig Bee signal which may exist in the channel it is currently using before transmitting the data, and if the Zig Bee signal is detected, it sets zero to the subcarrier corresponding to the occupied spectrum. The receiver identifies the sub-carriers used by the transmitter and completes the follow-up work. The interference between the signals is eliminated and the problem of coexistence of the two is solved by separating the spectrum of the Wi Fi signal from the Zig Bee signal. The parallel transmission of Wi Fi and Zig Bee data is realized. The experimental results on the experimental bed built by GNURadio/USRP software radio equipment and Zig Bee node show that, The 2 脳 2 incoherent MIMO with subcarrier zeroing technique can achieve 50% throughput in the state of full bandwidth transmission, and the correct packet rate of Zig Bee in the process of data parallel transmission is more than 90%.
【作者单位】：天津大学计算机科学与技术学院;
【基金】：国家自然科学基金资助项目(610172063)
【分类号】：TN92

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