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Zigbee和Wi_Fi的干扰和共存

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标签: 物联网

物联网是新一代信息技术的重要组成部分,也是“信息化”时代的重要发展阶段。其英文名称是:“Internet of things(IoT)”。利用局部网络或互联网等通信技术把传感器、控制器、机器、人员和物等通过新的方式联在一起,形成人与物、物与物相联,实现信息化、远程管理控制和智能化的网络。物联网是互联网的延伸,它包括互联网及互联网上所有的资源,兼容互联网所有的应用,但物联网中所有的元素(所有的设备、资源及通信等)都是个性化和私有化。

Zigbee和Wi_Fi的干扰和共存

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27 18 Vol 27 No 18 Computer Engineering and Design 9 2006 Sept 2006 Zigbee WiFi Zigbee Fi WiFi 200072 IEEE802154 Zigbee WiFi Zigbee WiFi Wi Zigbee WiFi TN92593 A 10007024 2006 18339703 Interference and coexistence between Zigbee and WiFi School of Communication and Information Engineering Shanghai University Shanghai 200072 China CHEN Cong FENG Yulin SHI Huichang Abstract Zigbee is a recently developed shortdistance wireless communication technology It defines the network for the MAC and PHY Sp......

27 18 Vol. 27 No. 18 Computer Engineering and Design 9 2006 Sept. 2006 Zigbee Wi-Fi Zigbee Fi ( Wi-Fi 200072) IEEE802.15.4 Zigbee Wi-Fi Zigbee Wi-Fi Wi- Zigbee Wi-Fi TN925.93 A 1000-7024 (2006) 18-3397-03 Interference and coexistence between Zigbee and Wi-Fi (School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China) CHEN Cong FENG Yu-lin SHI Hui-chang Abstract Zigbee is a recently developed short-distance wireless communication technology. It defines the network for the MAC and PHY Specifications of IEEE 802.15.4 and has the characters of low power consumption, low cost and low complexity. Zigbee and Wi- Fi have different applications. Zigbee fits the applications of auto control and remote monitor, and it is an effective complementarity for Wi-Fi. Due to using the same frequency band, it is not avoid that there exists interference between them. Zigbee is compared with Wi- Fi on the main characters, the interference reason of them is presented, and the impact of the interference on performance between Zigbee and Wi-Fi is analysed in the indoor environment in detail. At last, several solutions for improved coexistence are presented. Key words interference; coexistence; WPAN Zigbee; Wi-Fi; 0 (WLAN) (WMAN) Fi 1 Zigbee Wi-Fi Zigbee Wi- (WPAN) Zigbee [1] Zigbee Zigbee IEEE802.15.4 IEEE802.15.4 Zigbee 1.5 In-Stat/MDR IEEE802.11b 2.5 2008 Wi-Fi Fi 2.4 GHz ISM Zigbee Wi-Fi 2005-07-06 (1980 ) (045115012) (1946 ) 1.5 Zigbee Wi- Zigbee Wi-Fi 1 [2,3] 1 Zigbee Wi-Fi Zigbee DSSS 64 000 10 Kb/s~250 Kb/s 70 m~300 m 100~1 000+ 4 Kb~32 Kb (days) Wi-Fi DSSS 32 11 Mb/s 100 m 0.5~5 1 Mb+ Ad Hoc (1981 ) Ad Hoc 3397 2 2.1 Zigbee (ISM) 2.4 GHz 868/915 MHz 868 MHz 915 MHz ISM 2.4 GHz ISM Wi-Fi Zigbee 2.4 GHz 1 2 MHz ISM 16 [4] Wi-Fi SIR STA SIR ) < < 2 2 0 0 = 1 = = 1= 0 +10 log10 0 +10 log10 + + 0 0 — — AP — — Zigbee SIR = +10 log10 11 3 22 MHz 2 11 3 Zigbee Zigbee Wi-Fi 2.2 Zigbee Wi-Fi Zigbee Wi-Fi Zigbee Wi-Fi 4 Zigbee [ ] STA D =1 1 Zigbee [ ] 2 Wi-Fi 1/4 < = 2 = 10 log10 / 2 = / 2 0 1 = 1 2 1 2 = 1 2 1 2 +exp 1 2 2 STA + 1 = 2 / = + log10 = 1 2 1 Zigbee Zigbee SIR [6] 15.4 = 2exp 2 10 log10 50 log10 2 =1 1 Zigbee IEEE802. 1 %[4] 10dBm[7] AP Zigbee = 5 AP R d r = 0 +10 log10 + 0 — — [5] [6] ( Zigbee ) R STA 2 MHz — — 0— — SIR SIR Channel 14 dBm 0 dBm[4] [6] STA ( STA 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 2405 2410 2415 2420 2425 2430 2435 2440 2445 2450 2455 2460 2465 2470 2475 2480 2400 MHz 2453.5 MHz IEEE802.15.4 ; STA; AP 1 Zigbee 2.4 GHz Channel 1 22 MHz Channel 6 Channel 11 4 Zigbee Wi-Fi 2400 MHz 2412 MHz 2437 MHz 2462 MHz 2483.5MHz 2 Wi-Fi 2.4 GHz ( ) Channel 1 22 MHz Channel 7 Channel 13 2400 MHz 2412 MHz 2442 MHz 2472 MHz 2483.5 MHz 3 Wi-Fi 2.4 GHz ( ) 3398 ] C [ P 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 2 4 6 8 12 10 d (m) 14 16 18 20 (n=3.3 D=1/16 nodes/m )2 =6; =8; =10 5 Wi-Fi Zigbee 3 3.1 IEEE802.15.2 [8] Zigbee Wi-Fi Zigbee Wi-Fi 3.2.3 Zigbee Wi-Fi 4 Zigbee Wi-Fi Zigbee Wi-Fi MAC : [1] , 2003,6(6):33-35. [2] ZigBee Alliance. Emerging standards -where does ZigBee fit ZigBee [J]. , . Zigbee 3.2 3.2.1 MAC 3.2.2 ACK [3] [4] [EB/OL].http://www.zigbee.org/en/resources. IEEE Std 802.11b.Part 11:Wireless LAN medium access control (MAC)and physical layer(PHY)specifications[S]. 2001. IEEE Std 802.15.4.Wireless medium access control (MAC) and physical layer (PHY) specifications for low-rate wireless per- sonal area networks (LR-WPANs)[S]. 2003. [5] Theodore S Rappaport. [M]. : , 1998. Zigbee Wi-Fi sactions on Vehicular Technology, 2001,50(4):1114-1124. [6] Howitt I.WLAN and WPAN coexistence in UL band [J].Tran- [7] Kamerman A.Coexistence between bluetooth and IEEE 802.11 CCK solutions to avoid mutual interference[Z].Lucent Techno- lo-gies Bell Laboratories, 1999. IEEE Std 802.15.2. Coexistence of wireless personal area net- works with other wireless devices operating in unlicensed fre- quency bands[S]. 2003. [8] ISM ( 3396 ) : . [1] [EB/OL] . =4255. [2] Frederick P,Brooks J R. The mythical man-month[M]. : , 2003. [3] CNET Networks Inc. [EB/OL]. [4] [5] . PowerBuilder [J]. .MIS , 2002,23(6):10-13. , 2002,22(2):93-94. [J]. [6] [7] [8] [9] [10] [11] , , 2000.102-120. , , : , . [J]. , 2001,22(3):61-63. , , . [J]. , 2004,25(9):1557-1559. , . , 2004,25(1):102-104. [M]. . : . PowerBuilder 8.0 , 2002.38-238. [J]. , [M]. .PowerBuilder , , 1999.16-118. [M]. : 3399
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