【摘要】：在移動互聯(lián)網(wǎng)和物聯(lián)網(wǎng)迅猛發(fā)展的背景下,越來越多的短距離無線通信設備出現(xiàn)在日常生活中,很大程度上解決了密集用戶最后十米的接入問題。ISM 2.4GHz是唯一在全球范圍內(nèi)免費開放的頻段,基于IEEE802.15.4標準的ZigBee技術和無線局域網(wǎng)WLAN都是在ISM 2.4GHz頻段上廣泛應用的無線技術。隨著近年來2.4GHz頻段上的無線設備日益增多,該頻段日益擁擠,不同系統(tǒng)間的干擾也日益嚴重。由于WLAN的帶寬和功率都比ZigBee的大得多,對于WLAN系統(tǒng)而言,ZigBee的干擾可以忽略不計;相反在WLAN的干擾下,ZigBee系統(tǒng)性能會嚴重下降。通信頻譜資源的有限性不能滿足無線需求的快速增長,如何充分利用無線資源降低不同系統(tǒng)間的干擾成為研究熱點,本文結合理論和實驗分析了近距離情況下,WLAN干擾對ZigBee系統(tǒng)性能的影響。本文首先簡要介紹了 IEEE802.11b協(xié)議和IEEE802.15.4協(xié)議的技術特點,以及物理層和MAC層規(guī)范,接著介紹了 ZigBee技術的體系結構、網(wǎng)絡拓撲。接下來分析了 ZigBee系統(tǒng)自身抗干擾性,主要是IEEE802.15.4采用的CSMA/CA機制、CCA、接收端的能量檢測等。針對WLAN對ZigBee性能的干擾是基于分析模型的,本文介紹了兩種干擾分析模型,以及WLAN干擾下ZigBee系統(tǒng)性能的變化,包括誤碼率、分組錯誤率、延時、吞吐量、ZigBee組網(wǎng)等。本文總結了 WLAN對ZigBee干擾的物理層和MAC層多種干擾檢測方法,在判定干擾程度的基礎上,通過頻分復用、時分復用、空間復用的方法合理調(diào)度時間、空間、頻譜等無線資源以改進WLAN和ZigBee的共存問題。針對ISM頻段內(nèi)WLAN對ZigBee的干擾問題,本文通過實驗檢測了實際應用環(huán)境中ZigBee的通信質(zhì)量。實驗結果驗證了 ZigBee的分組錯誤率與WLAN發(fā)射功率、工作信道以及距離之間的相關性,WLAN的干擾可以使ZigBee分組錯誤率高達90%。本文為ZigBee研究抗干擾性能提供了頗有價值的理論和實驗依據(jù)。
[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.
【學位授予單位】：山東大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN925.93;TN92

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1 朱晨;WLAN對ZigBee傳感器網(wǎng)絡的干擾問題研究[D];山東大學;2017年

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本文編號：2413933