WLAN对ZigBee传感器网络的干扰问题研究
发布时间：2019-01-23 15:10
【摘要】：在移动互联网和物联网迅猛发展的背景下,越来越多的短距离无线通信设备出现在日常生活中,很大程度上解决了密集用户最后十米的接入问题。ISM 2.4GHz是唯一在全球范围内免费开放的频段,基于IEEE802.15.4标准的ZigBee技术和无线局域网WLAN都是在ISM 2.4GHz频段上广泛应用的无线技术。随着近年来2.4GHz频段上的无线设备日益增多,该频段日益拥挤,不同系统间的干扰也日益严重。由于WLAN的带宽和功率都比ZigBee的大得多,对于WLAN系统而言,ZigBee的干扰可以忽略不计;相反在WLAN的干扰下,ZigBee系统性能会严重下降。通信频谱资源的有限性不能满足无线需求的快速增长,如何充分利用无线资源降低不同系统间的干扰成为研究热点,本文结合理论和实验分析了近距离情况下,WLAN干扰对ZigBee系统性能的影响。本文首先简要介绍了 IEEE802.11b协议和IEEE802.15.4协议的技术特点,以及物理层和MAC层规范,接着介绍了 ZigBee技术的体系结构、网络拓扑。接下来分析了 ZigBee系统自身抗干扰性,主要是IEEE802.15.4采用的CSMA/CA机制、CCA、接收端的能量检测等。针对WLAN对ZigBee性能的干扰是基于分析模型的,本文介绍了两种干扰分析模型,以及WLAN干扰下ZigBee系统性能的变化,包括误码率、分组错误率、延时、吞吐量、ZigBee组网等。本文总结了 WLAN对ZigBee干扰的物理层和MAC层多种干扰检测方法,在判定干扰程度的基础上,通过频分复用、时分复用、空间复用的方法合理调度时间、空间、频谱等无线资源以改进WLAN和ZigBee的共存问题。针对ISM频段内WLAN对ZigBee的干扰问题,本文通过实验检测了实际应用环境中ZigBee的通信质量。实验结果验证了 ZigBee的分组错误率与WLAN发射功率、工作信道以及距离之间的相关性,WLAN的干扰可以使ZigBee分组错误率高达90%。本文为ZigBee研究抗干扰性能提供了颇有价值的理论和实验依据。
[Abstract]:With the rapid development of mobile Internet and Internet of things, more and more short-range wireless communication devices appear in daily life. To a large extent, it solves the problem of the last 10 meters of access for intensive users. ISM 2.4GHz is the only frequency band that is free of charge on a global scale. Both ZigBee technology based on IEEE802.15.4 standard and WLAN are widely used in ISM 2.4GHz band. In recent years, with the increasing number of wireless devices in the 2.4GHz band, the frequency band is becoming increasingly crowded, and the interference between different systems is becoming more and more serious. Because the bandwidth and power of WLAN are much larger than that of ZigBee, the interference of ZigBee can be ignored for WLAN system. On the contrary, the performance of ZigBee system will be seriously degraded under the interference of WLAN. The limitation of communication spectrum resources can not meet the rapid growth of wireless demand. How to make full use of wireless resources to reduce interference between different systems has become a research hotspot. The effect of WLAN interference on the performance of ZigBee system. In this paper, the technical characteristics of IEEE802.11b and IEEE802.15.4 protocols, the specification of physical layer and MAC layer, and the architecture and network topology of ZigBee are introduced briefly. Secondly, the anti-jamming performance of ZigBee system is analyzed, including the CSMA/CA mechanism adopted by IEEE802.15.4, the energy detection of CCA, receiver and so on. This paper introduces two kinds of interference analysis models for WLAN to ZigBee performance, and the performance changes of ZigBee system under WLAN interference, including bit error rate, packet error rate, delay, throughput, ZigBee network, etc. This paper summarizes the physical and MAC interference detection methods of ZigBee interference by WLAN. On the basis of judging the degree of interference, the methods of frequency division multiplexing, time division multiplexing and spatial multiplexing are used to schedule the time and space reasonably. Spectrum and other wireless resources to improve the coexistence of WLAN and ZigBee. Aiming at the interference of WLAN to ZigBee in ISM band, the communication quality of ZigBee in practical application environment is tested experimentally in this paper. The experimental results verify the correlation between the packet error rate of ZigBee and the transmission power, working channel and distance of WLAN. The interference of WLAN can make the packet error rate of ZigBee up to 90%. This paper provides a valuable theoretical and experimental basis for the study of anti-jamming performance of ZigBee.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN925.93;TN92
本文编号：2413933
[Abstract]:With the rapid development of mobile Internet and Internet of things, more and more short-range wireless communication devices appear in daily life. To a large extent, it solves the problem of the last 10 meters of access for intensive users. ISM 2.4GHz is the only frequency band that is free of charge on a global scale. Both ZigBee technology based on IEEE802.15.4 standard and WLAN are widely used in ISM 2.4GHz band. In recent years, with the increasing number of wireless devices in the 2.4GHz band, the frequency band is becoming increasingly crowded, and the interference between different systems is becoming more and more serious. Because the bandwidth and power of WLAN are much larger than that of ZigBee, the interference of ZigBee can be ignored for WLAN system. On the contrary, the performance of ZigBee system will be seriously degraded under the interference of WLAN. The limitation of communication spectrum resources can not meet the rapid growth of wireless demand. How to make full use of wireless resources to reduce interference between different systems has become a research hotspot. The effect of WLAN interference on the performance of ZigBee system. In this paper, the technical characteristics of IEEE802.11b and IEEE802.15.4 protocols, the specification of physical layer and MAC layer, and the architecture and network topology of ZigBee are introduced briefly. Secondly, the anti-jamming performance of ZigBee system is analyzed, including the CSMA/CA mechanism adopted by IEEE802.15.4, the energy detection of CCA, receiver and so on. This paper introduces two kinds of interference analysis models for WLAN to ZigBee performance, and the performance changes of ZigBee system under WLAN interference, including bit error rate, packet error rate, delay, throughput, ZigBee network, etc. This paper summarizes the physical and MAC interference detection methods of ZigBee interference by WLAN. On the basis of judging the degree of interference, the methods of frequency division multiplexing, time division multiplexing and spatial multiplexing are used to schedule the time and space reasonably. Spectrum and other wireless resources to improve the coexistence of WLAN and ZigBee. Aiming at the interference of WLAN to ZigBee in ISM band, the communication quality of ZigBee in practical application environment is tested experimentally in this paper. The experimental results verify the correlation between the packet error rate of ZigBee and the transmission power, working channel and distance of WLAN. The interference of WLAN can make the packet error rate of ZigBee up to 90%. This paper provides a valuable theoretical and experimental basis for the study of anti-jamming performance of ZigBee.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN925.93;TN92
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1 朱晨;WLAN对ZigBee传感器网络的干扰问题研究[D];山东大学;2017年
，本文编号：2413933
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