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[] 802.11axƾʲôսʤ802.11adת

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       ȷWiFiЭ׼ʱһʱ䣬ҶΪ802.11adЭ顣802.11ad Wi-FiΪ4600Mbpsȵʱ802.11acı802.11ad IEEE WiGig˴802.11ad2009ʽȻ2011IEEEݰ׶ΣWiGigWiFi2013ϲʽΪٷWiFi׼


ǰе WiFi ׼ͬ802.11adȫµƵΡ802.11b/g/n/ac õ 2.4GHz 5GHz ƵΣ802.11adõ60GHzƵΣϸ˵ 802.11adʹõƵ5766GHz֮䣬ȡסĸ֡60GHzζſԴݣҲһЩȱ㡣


ǣƵԽ߻򲨳Խ̣ʾԽⲻ⣬ʵȴľذשǽƵԶ봫ϻѡΪʲôߵ͵ӵijƵźſԴԶľ룬ɼĶ̲źŻᱻա


WiFiƵʶ΢𣬴30000MHz300GHz֮䣬ֱΪ1׵1ס2.4GHzʽWiFi׼a/b/gIJ㹻ͣõĴ͸Ժܿͨˡźǽڡ802.11n/ac5GHzƵʣ÷ΧСҲΪʲô·֧2.4GHz5GHz磨Լԣԭ򣬵5GHzƵں̶ֻܴСͼͥ


802.11ad˵ź޷͸һשǽǼ򵥵ľҲԴӰ졣ˣ802.11adȷṩdzٶȣǰ·ͬһ䡣һ߳䣬Զ·ġ߷Χ֮⣬źžͻᶪʧ


ҲͲ⣬802.11adղ802.11axʧWiFi׼ԭ


802.11axΪ802.11acļݽ2013IEEEͿʼ802.11axо2014ʽax飨Task Group 11ax201611º20179·ֱ˵һ͵ڶ׼ݰȻδܻ802.11axС75%ϳԱͶƱϿɣĿǰĵ棬Ҳ3.0汾ݰУԤƻ2019ʽ׼Ȼʽ׼δɣDzӰ802.11axļչ


360ͼ20181012145547317.jpg


ǰȣ802.11ac802.11axҪĿܼûнûƽ4ȻҪڼ㹻Ҫ漰MU-MIMOOFDMAMCS档


һMU-MIMO


MU-MIMOûҲҪӦ802.11ac WAVE2ļӦ802.11nϵMIMOߴ䣩ԣҪ·õ·ָߣΪͬ豸䡣


2015Ƴ802.11ac Wave 2һҪӦMU-MIMOʹAPڵͬʱ֧MU-MIMOĿͻ˷ݰ·֮ǰһֻܺһնͨŵ⡣802.11ac Wave 2ʱֵ֧44 MU-MIMOͬʱ4ն˹еMU-MIMOݰ


϶ԣ802.11axӵ88 MU-MIMOͬʱ8ն˹СеMU-MIMOݰ⣬802.11ax׼豸APն˷ݰʱһݰն˽ڵ㷢ͣ⼸ն˽ڵҲܹЭͬʱAPˡзݰݰͬʱAPAPҲԽ롢ͬʱеݰЧʾߡ


OFDMA


802.11ac֮ǰWiFi׼õĶOFDMƵָãƷʽǶز䷽ʵַʽ֮һø÷ʽ豸ͬһֻ֡һ׼ݰͻ˵ʱ򲻹֡ĴСЭĽǶŵͷϵͳһġ⣬OFDMϵͳУûռŵû࣬û֮ᷢͻӶµЩûʱϲ


802.11axõOFDMAƵֶַƷʽüOFDMݽOFDMAѾڷձӦã԰ѸִСݰӵƵĽǶһϵͳͨͣͬʱ֧кУЧʵõߡͬʱOFDMAķŵijҲÿһźŵķųȱ802.11ac4ƵijԽڶ·£APˡͻ˾иĻԳö·ͨĴڰѲͬǶȷźһʵӦóУرԶ봫ʱڶ·Ƚǿ£ǿܵȶҲˡ


MCSԣ


漰QAMƣزƼƽصĽϡ802.11acֻ֧256-QAM802.11axֵ֧1024-QAMڵܶԽ󣬳صҲԽ802.11ax802.11acڳ23ݽǶռ80MĹʴ433Mbps600.4Mbpsʣ160M8ռ6.9Gbps9.6Gbpsҡ


802.11axҲΪЧ(High-Efficiency Wireless - HEW)ͨһϵϵͳԺͶֻϵͳͨõһ¸ǺͼٿտڽӵWi-FiĹʽʹû;ܼûУΪûṩһºͿɿĿǽûƽ4Ҳ˵802.11axWi-Fiζǰδеĸ͸Чʡ




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