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1、基于IEEE802.15.4無線個域網(wǎng)的研究與實現(xiàn)摘要i隨著通信技術(shù)和半導體技術(shù)的飛速發(fā)展,以及人們對無線接入技術(shù)的需求日益增長,無線通信和無線網(wǎng)絡(luò)均呈現(xiàn)出指數(shù)增長的趨勢。這有力地推動了無線通信向高速通信的方向發(fā)展。然而,工業(yè)、農(nóng)業(yè)、車載電子系統(tǒng)、家用網(wǎng)絡(luò)、醫(yī)療傳感器和伺服執(zhí)行機構(gòu)等卻是無線通信還未涉足或剛涉足的領(lǐng)域。這些領(lǐng)域?qū)?shù)據(jù)吞吐量的要求很低,功率消耗也比現(xiàn)有標準提供的功率消耗低。此外,+為了促使簡單方便的、可以隨意使用的無線裝置大量涌現(xiàn),需要在未來的個人活動空間內(nèi)布置大量的無線接入點,因而低廉的價格將起到關(guān)鍵作用。IEEE802.15.4標準的制
2、定為低功耗、低速率、低成本的無線個域網(wǎng)的發(fā)展提供了一個標準的規(guī)范。,zigBee∞1作為IEEE802.15.4規(guī)范的主要技術(shù)之一,由于其設(shè)●計實現(xiàn)復雜度較高,系統(tǒng)成本相對偏高,在許多簡單的應用場合并不適用。本文主要研究了基于IEEE802.15.4標準的無線個域網(wǎng)技術(shù),并在CC2420+MSP430FG4619硬件平臺上設(shè)計實現(xiàn)了基于802.15.4標準的無線個域網(wǎng)協(xié)議棧。該協(xié)議棧的物理層和MAC層的實現(xiàn)完全符合IEEE802.15.4所定義的規(guī)范。在網(wǎng)絡(luò)層和應用層借鑒了ZigBee的一些技術(shù)特點,并在此基礎(chǔ)上進行了大量的簡化和部分改進,實現(xiàn)了相對簡單
3、且實用的無線個域網(wǎng)系統(tǒng),使系統(tǒng)成本降低,復雜度降低,更適宜實際應用。j關(guān)鍵詞:無線個域網(wǎng),IEEE802.i5.4,低功耗ResearchAndImplementWirelessPersonalAreaNetworkBasedOnIEEE802.15.4ABSTRACTAsthehighspeeddevelopmentofthetechnologyofcommunicationandsemiconductor,andmoreandmorepeoplebecominginteretedinwirelessaccesstechnology,wirelessc
4、ommunicationtechnologyisbecomingoneofdominatingtechnologiesincommunicationfield.Inthepastyears,peoplepaymuchattentiononhighratewirelesstechnology.However,wirelesscommunicationtechnologyseldomornotwidelyusedinsomeapplicationfieldssuchasindustralcontrol,agriculturalsupervision,vehi
5、cleelectronicsystem,homenetwork,medicalsensors,servooperationandSOon.Theseapplicationfieldsdemandlowerdatarateandlowerpowerconsumptionthancurrentmainwirelessstandard.Futhermore,givenagreatnumberofwirelessdeviceswillappearinpersonal‘a(chǎn)reabeforelong,thecostisoneofimportantfactorstod
6、rivingwirelessdeviceswidelyusedintheseapplicationfieldsasmanyaspossible.IEEE802.15.4workgroupputforwardastandard,whichisverysuitableforlowpowerconsumption,towdatarate,lowcostwirelessapplications.OneofthetechnologiesbasedonIEEE802.15.4standardiscalledZigBee.SinceZigBeeistoocomplic
7、atedandtooexpensiveformostsimpleapplications,itisnotthebestchoiseforthoseapplications.theIImainjobofthisthesisistoresearchwirelesspersonalareanetworktechnologybasedonIEEE802.15.4standard.OurobjectiveistoimplementthereducedprotocolstackbasedonIEEE802.15.4standardandapplicationonTe
8、xasInstrumentCC2420+MSP430FG4619platform