wi-fi技術外文翻譯

1、<p>　　1700單詞，2950漢字</p><p>　　Wi-Fi Technology</p><p>　　Wi-Fi stands for Wireless Fidelity, also known as the 802.11b standard. Its biggest advantage is the high transmission speed can reach

2、 11Mbps, another effective long distance, at the same time compatible with the existing variety of 802.11DSSS equipment. Along with Intel's laptop chipset,"Centrino" is recognized by more and more people, t

3、his technology has become a topic of concern to everyone. However, since the end of 2005, many mobile phone manufacturers, especially the production of smart ph</p><p>　　With Wi-Fi, no cable can be linked in

4、to the network. More and more devices installed in the factory, Wi-Fi module, but also more and more places to offer Wi-Fi signal coverage. In this way, the Wi-Fi formed from research to equipment production, from networ

5、k access to network services is a huge industrial chain. In 2007, the value of the national the wlan industry, including Wi-Fi industry is expected to exceed 100 million U.S. dollars. For individual users, the popularity

6、 of Wi-Fi, it will be a</p><p>　　Laptop users will be able to any one with Wi-Fi signal coverage fast access to the Internet without the need to go looking for network cable, a growing number of airports, ho

7、tels, public places, offer Wi-Fi signal coverage. In a timely manner with a laptop computer to meetings, do not worry do not have enough network cable jack in the conference room. At home, you can even in any corner of t

8、he coverage of wireless signals, without having to worry about the alignment of the cable affect the overa</p><p>　　Wi-Fi in handheld devices are widely used, and smart phones is part of it. Different from t

9、he earlier Bluetooth technology used in mobile phones, Wi-Fi has a greater coverage and higher transmission rates, Wi-Fi phones has become a fashion trend of the mobile communications industry.</p><p>　　Wi-F

10、i bands in the world without any telecom operator license free band, WLAN wireless devices provides a worldwide can be used, the cost is extremely low and very high data bandwidth wireless air interface. Users can browse

11、 the web quickly in the Wi-Fi coverage area, anytime, anywhere and receive phone calls. Other WLAN-based broadband data applications such as streaming media, online games and other functions more user should expect. With

12、 Wi-Fi capability, long-distance calls (including intern</p><p>　　Wi-Fi flip range more widely in the country, luxury hotels, luxury residential, airports and coffee shops class area has Wi-Fi interface. Whe

13、n we went to the tourist office, you can use our handheld devices in such places and enjoy surfing the web.</p><p>　　A Wi-Fi connection point network members and structure of the site (Station), the network

14、of basic components. The basic service unit (Basic service the Set, BSS). Network basic service unit. The most simple unit can only be composed by the two sites. The site can be dynamic link (associate) to the basic serv

15、ice unit.</p><p>　　Distribution System Distribution System (DS). The distribution system used to connect different basic service unit. The media distribution system medium (Medium) logic and the basic servic

16、e unit is completely separate, even though they physically may be the same media, for example, the same radio frequency band.</p><p>　　Access point (Acess Point, AP). Access point that the identity of the or

17、dinary sites, and access to the distribution function of the system.</p><p>　　Extended Service Unit (Extended Service Set ESS). A combination of the distribution system and basic services unit. This combinat

18、ion is logical, not physical - the basic service unit of matter may be geographically far removed from. Distribution system can also use a variety of techniques.</p><p>　　Mark (Portal) is a logical compositi

19、on. For wireless LAN and wired LAN or other network link.</p><p>　　Here are three kinds of media, the site uses wireless media distribution system to use the media, and other LAN and wireless LAN integration

20、 together media. Physically, they may overlap each other.</p><p>　　The IEEE802.11 only responsible for addressing (Addressing,) on the site uses the wireless medium. Distribution systems and other LAN addres

21、sing a range of wireless LAN.</p><p>　　The IEEE802.11 no specific definition of the distribution system, but the definition of the distribution system should provide the services (Service). The entire wirele

22、ss LAN defines nine kinds of service, five kinds of services are part of the task of distribution systems, respectively, joins (Association), the end connection (Diassociation), distribution (Distribution,), integration

23、(Integration), to re-connect.</p><p>　　Four kinds of services are the tasks of the site, respectively, authentication (Authentication), the end of the authentication (Deauthentication), privacy (Privacy), MA

24、C data transmission (the MSDU delivery).</p><p>　　The main technical advantage of the Wi-Fi</p><p>　　First A radio wave coverage, the coverage of radio based on Bluetooth technology is very sma

25、ll radius of only about 50 feet, or about 15 meters. Wi-Fi radius of up to about 300 feet, or about 100 meters. A new type of by Vivato company recently launched the switches, which products to current Wi-Fi wireless net

26、work 300 ft, close to 100 m communication distance expanded to four miles, about 6.5 km.</p><p>　　Second Although the quality of wireless communications transmitted by the Wi-Fi technology is not very good

27、performance of data security than Bluetooth worse, the transmission quality to be improved, but the transfer speed is very fast, you can reach 11Mbps, in line with the needs of personal and social information.</p>

28、<p>　　Third manufacturers to enter the field is relatively low threshold. Vendors set up "hot spots" in airports, railway stations, coffee shops, libraries and other personnel intensive, and high-speed l

29、ine Internet access to these places. Such "hot spots" to emit radio waves can reach tens of meters to 100 meters away from the radius of the access point, as long as the user will support wireless LAN notebook

30、or PDA to get the region to high-speed Internet access. Means that manufacturers do not have</p><p>　　Wi-Fi methods of organizing</p><p>　　Wi-Fi is a wireless network by the AP (Access Point) an

31、d Wireless LAN. Generally set up a wireless network equipped with a wireless card and the AP, so will be able to wireless mode, with both wired architecture to share network resources, erection cost and complexity of the

32、 program is far lower than a traditional wired network. If only a few computers, peer-to-peer network, can also be not to the AP, only require each computer is equipped with a wireless card. AP is generally translated as

33、 "wir</p><p>　　Wi-Fi is the complement of high-speed wired access technologies</p><p>　　At present, the wired access technologies including Ethernet, xDSL, etc. Wi-Fi technology as a comple

34、ment of high-speed wired access technology, has the advantage of mobility, inexpensive Wi-Fi technology is widely used in the field of need a wireless extension of wired access, such as the temporary venue. Data rate, co

35、verage and reliability of the difference, Wi-Fi technology in broadband applications will be as a complement of high-speed wired access technologies. The key technology is no doub</p><p>　　Wi-Fi is the compl

36、ement of cellular mobile communication and 3G</p><p>　　Secondary positioning of the Wi-Fi technology ---- the complement of cellular mobile communication. Cellular mobile communication can provide a wide cov

37、erage, high mobility and the low data transfer rate, it can use the Wi-Fi high-speed data transmission characteristics to compensate for the deficiencies of their own data transfer rate is limited. Wi-Fi not only the use

38、 of cellular mobile communication network authentication and billing mechanisms, and characteristics of multi-access switching f</p><p><b>　　Wi-Fi技術</b></p><p>　　Wi-Fi的全稱是Wireless Fi

39、delity，又叫802.11b標準。它的最大優(yōu)點就是傳輸速度較高，可以達到11Mbps，另外它的有效距離也很長，同時與已有的各種802.11DSSS設備兼容。伴隨著Intel公司提出的筆記本電腦芯片組?！把格Y”被越來越多的人認可，這一技術也逐漸成為了大家關注的話題。不過自2005年底開始，很多手機廠商，特別是以生產智能手機為主的品牌便開始將Wi-Fi引入自己的產品當中。簡而言之：Wi-Fi就是無線網絡Wi-Fi已經廣泛的應用在了筆記本

40、電腦，手機掌上電腦，數(shù)碼相機等移動終端上。</p><p>　　有了Wi-Fi之后，不需要網線即可聯(lián)入網絡。越來越多的設備在出廠前安裝了Wi-Fi模塊，也有越來越多的場所提供了Wi-Fi信號覆蓋。這樣，Wi-Fi形成了一個從科研到設備生產、從網絡接入到網絡內容服務等一個龐大的產業(yè)鏈。2007年，全國包括Wi-Fi在內的wlan行業(yè)產業(yè)價值有望超億美元。對于個人用戶來說，Wi-Fi的普及，將是用戶體驗的一次飛躍。&

41、lt;/p><p>　　筆記本電腦用戶將可以任意一個具備Wi-Fi信號覆蓋的地方快速接入Internet而不需要再去尋找網線，越來越多的機場、酒店、公共場所都提供了Wi-Fi信號覆蓋。及時帶筆記本電腦開會，也不用擔心會議室沒有足夠的網線插口。而在家中，您更可以在任何一個角落都覆蓋無線信號，而不需要擔心網線的走線影響整體室內美觀。</p><p>　　Wi-Fi在掌上設備上應用越來越廣泛，而智能

42、手機就是其中一份子。與早前應用 于手機上的藍牙技術不同，Wi-Fi具有更大的覆蓋范圍和更高的傳輸速率，因此Wi-Fi手機成為了目前移動通信業(yè)界的時尚潮流。</p><p>　　由于Wi-Fi的頻段在世界范圍內是無需任何電信運營執(zhí)照的免費頻段，因此WLAN無線設備提供了一個世界范圍內可以使用的，費用極其低廉且數(shù)據帶寬極高的無線空中接口。用戶可以在Wi-Fi覆蓋區(qū)域內快速瀏覽網頁，隨時隨地接聽撥打電話。而其它一些基于

43、WLAN的寬帶數(shù)據應用，如流媒體、網絡游戲等功能更是值得用戶期待。有了Wi-Fi功能我們打長途電話(包括國際長途哦)，瀏覽網頁、收發(fā)電子郵件、音樂下載、數(shù)碼照片傳遞等，再無需擔心速度慢和花費高的問題。</p><p>　　現(xiàn)在Wi-Fi翻蓋范圍在國內越來越廣泛了，高級賓館，豪華住宅區(qū)，飛機場以及咖啡廳之類的區(qū)域都有Wi-Fi接口。當我們去旅游，辦公時，就可以在這些場所使用我們的掌上設備盡情網上沖浪了。</p

44、><p>　　一個Wi-Fi聯(lián)接點網絡成員和結構站點(Station) ，網絡最基本的組成部分?；痉諉卧?Basic Service Set, BSS) 。網絡最基本的服務單元。最簡單的服務單元可以只由兩個站點組成。站點可以動態(tài)的聯(lián)結(associate)到基本服務單元中。</p><p>　　分配系統(tǒng)(Distribution System, DS) 分配系統(tǒng)用于連接不同的基本服務單元

45、。分配系統(tǒng)使用的媒介(Medium) 邏輯上和基本服務單元使用的媒介是截然分開的，盡管它們物理上可能會是同一個媒介，例如同一個無線頻段。</p><p>　　接入點(Acess Point, AP) 接入點即有普通站點的身份，又有接入到分配系統(tǒng)的功能。</p><p>　　擴展服務單元(Extended Service Set, ESS) 由分配系統(tǒng)和基本服務單元組合而成。這種組合是邏

46、輯上，并非物理上的--不同的基本服務單元物有可能在地理位置相去甚遠。分配系統(tǒng)也可以使用各種各樣的技術。</p><p>　　關口(Portal) 也是一個邏輯成分。用于將無線局域網和有線局域網或其它網絡聯(lián)系起來。</p><p>　　這兒有3種媒介，站點使用的無線的媒介，分配系統(tǒng)使用的媒介，以及和無線局域網集成一起的其它局域網使用的媒介。物理上它們可能互相重迭。</p>&

47、lt;p>　　IEEE802.11只負責在站點使用的無線的媒介上的尋址(Addressing)。分配系統(tǒng)和其它局域網的尋址不屬無線局域網的范圍。</p><p>　　IEEE802.11沒有具體定義分配系統(tǒng)，只是定義了分配系統(tǒng)應該提供的服務(Service) 。整個無線局域網定義了9種服務，5種服務屬于分配系統(tǒng)的任務，分別為，聯(lián)接（Association), 結束聯(lián)接(Diassociation), 分配(

48、Distribution), 集成(Integration), 再聯(lián)接(Reassociation) 。</p><p>　　4種服務屬于站點的任務，分別為，鑒權(Authentication), 結束鑒權(Deauthentication), 隱私(Privacy), MAC數(shù)據傳輸(MSDU delivery) 。</p><p>　　Wi-Fi的主要技術優(yōu)勢</p>&

49、lt;p>　　1、無線電波的覆蓋范圍廣，基于藍牙技術的電波覆蓋范圍非常小，半徑大約只有50英尺左右，約合15米。而Wi-Fi的半徑則可達300英尺左右，約合100米。最近由Vivato公司推出的一款新型交換機，該款產品能夠把目前Wi-Fi無線網絡300英尺，接近100米的通信距離擴大到4英里，約6.5公里。</p><p>　　2、雖然由Wi-Fi技術傳輸?shù)臒o線通信質量不是很好，數(shù)據安全性能比藍牙差一些，傳

50、輸質量也有待改進，但傳輸速度非常快，可以達到11Mbps，符合個人和社會信息化的需求。 </p><p>　　3、廠商進入該領域的門檻比較低。廠商只要在機場、車站、咖啡店、圖書館等人員較密集的地方設置“熱點”，并通過高速線路將因特網接入上述場所。這樣由于“熱點”所發(fā)射出的電波可以達到距接入點半徑數(shù)十米至100米的地方，用戶只要將支持無線LAN的筆記本電腦或PDA拿到該區(qū)域內，即可高速接入因特網。也就是說廠商不用耗

51、費資金來進行網絡布線接入，從而節(jié)省了大量的成本。</p><p><b>　　Wi-Fi組建方法</b></p><p>　　Wi-Fi是由AP（Access Point）和無線網卡組成的無線網絡。一般架設無線網絡的基本配備就是無線網卡及一臺AP，如此便能以無線的模式，配合既有的有線架構來分享網絡資源，架設費用和復雜程序遠遠低于傳統(tǒng)的有線網絡。如果只是幾臺電腦的對等網

52、，也可不要AP，只需要每臺電腦配備無線網卡。AP一般翻譯為“無線訪問節(jié)點”，或“橋接器”。它主要當作傳統(tǒng)的有線局域網絡與無線局域網絡之間的橋梁，因此任何一臺裝有無線網卡的PC均可透過AP去分享有線局域網絡甚至廣域網絡的資源，其工作原理相當于一個內置無線發(fā)射器的HUB或者是路由，而無線網卡則是負責接收由AP所發(fā)射信號的CLIENT端設備。有了AP就像一般有線網絡的Hub一般，無線工作站可以快速且輕易地與網絡相連。特別是對于寬帶的使用，Wi

53、-Fi更顯優(yōu)勢，有線寬帶網絡（ADSL、小區(qū)LAN等）到戶后，連接到一個AP，然后在電腦中安裝一塊無線網卡即可。普通的家庭有一個AP已經足夠，甚至用戶的鄰里得到授權后，則無需增加端口，也能以共享的方式上網。 </p><p>　　Wi-Fi是高速有線接入技術的補充</p><p>　　目前，有線接入技術主要包括以太網、xDSL等。Wi-Fi技術作為高速有線接入技術的補充，具有為可移動性、價

54、格低廉的優(yōu)點，Wi-Fi技術廣泛應用于有線接入需無線延伸的領域，如臨時會場等。由于數(shù)據速率、覆蓋范圍和可靠性的差異，Wi-Fi技術在寬帶應用上將作為高速有線接入技術的補充。而關鍵技術無疑決定著Wi-Fi的補充力度?，F(xiàn)在OFDM、MIMO（多入多出）、智能天線和軟件無線電等，都開始應用到無線局域網中以提升Wi-Fi性能，比如說802.11n計劃采用MIMO與OFDM相結合，使數(shù)據速率成倍提高。另外，天線及傳輸技術的改進使得無線局域網的傳輸

55、距離大大增加，可以達到幾公里。</p><p>　　Wi-Fi是蜂窩移動通信與3G的補充</p><p>　　Wi-Fi技術的次要定位----蜂窩移動通信的補充。蜂窩移動通信可以提供廣覆蓋、高移動性和中低等數(shù)據傳輸速率，它可以利用Wi-Fi高速數(shù)據傳輸?shù)奶攸c彌補自己數(shù)據傳輸速率受限的不足。而Wi-Fi不僅可利用蜂窩移動通信網絡完善的鑒權與計費機制，而且可結合蜂窩移動通信網絡廣覆蓋的特點進行

56、多接入切換功能。這樣就可實現(xiàn)Wi-Fi與蜂窩移動通信的融合，使蜂窩移動通信的運營錦上添花，進一步擴大其業(yè)務量。對于電信運營商來說，Wi-Fi技術的定位主要是作為高速有線接入技術的補充，逐漸也會成為蜂窩移動通信的補充。當然Wi-Fi與蜂窩移動通信也存在少量競爭。一方面，用于Wi-Fi的IP話音終端已經進入市場，這對蜂窩移動通信有一部分替代作用。另一方面，隨著蜂窩移動通信技術的發(fā)展，熱點地區(qū)的Wi-Fi公共應用也可能被蜂窩移動通信系統(tǒng)部分取