無線傳輸層 的英文怎麼說

中文拼音 [wúxiànzhuànshūcéng]
無線傳輸層 英文
wtl wireless transmission layer
  • 無 : 無Ⅰ動詞（沒有） not have; there is not; be without Ⅱ名詞1 （沒有） nothing; nil 2 （姓氏） a surn...
  • 線 : 名詞1 （用絲、棉、金屬等製成的細長的東西） thread; string; wire 2 [數學] （一個點任意移動所構成的...
  • 傳 : 傳名詞1 （解釋經文的著作） commentaries on classics 2 （傳記） biography 3 （敘述歷史故事的作品）...
  • 輸 : Ⅰ動詞1 （運輸; 運送） transport; convey 2 [書面語] （捐獻） contribute money; donate 3 （失敗） l...
  • 層 : i 量詞1 （用於重疊、積累的東西 如樓層、階層、地層） storey; tier; stratum 2 （用於可以分項分步的...
  • 無線 : wireless無線電報 wireless telegram; radiotelegram; 無線話筒 radio microphone ; 無線裝訂 unsewn binding
  1. The future wireless mobile communication systems are expected to provide ubiquitous, high - quality, and high - rate mobile multimedia transmission. however, hostile multipath fading radio conditions give rise to serious inter - symbol interference ( isi ) ; even worse, wireless channel are often time varying, which makes the system more vulnerable and more difficult to track the channel state. orthogonal frequency dvision multiplexing ( ofdm ), which is inherently resistant against isi, has invoked a popular research interest in recent years, and has been a promising candidate technology of the physical layer for future weideband high - date - rate wireless communications. notwithstanding, ofdm is much more vulnerable to errors of both time and frequency synchronization and to that of channel estimation, and how to obtain correct timing and channel estimation efficiently is highly critical to ofdm systems. the dissertation will focus on both of the aspects of ofdm systems mentioned above

    但是無線環境的多徑特性造成通信系統中嚴重的符號間干擾，同時無線通道的時變性使得通道特性跟蹤復雜。而正交頻分復用技術（ orthogonalfrequencydivisionmultiplexing ， ofdm ）正是一種解決符號間干擾的有效傳輸手段，因此ofdm技術作為未來寬帶高速率無線通信的物理層候選技術在當前引起了一股研究熱潮。但ofdm系統對定時同步誤差和通道估計誤差非常敏感，如何在ofdm系統中準確快速地實現符號同步和通道估計是至關重要的，本論文將重點針對這兩個問題進行討論。
  2. In packet based wireless video communications, when best band distribution, not only source distortion should be considered, but also channel distortion caused by channel errors. the existing macroblock - layer rate control schemes calculates quantization parameters of all macroblocks ( mb ) in a frame in a raster scan order, and then encodes the mbs in the same order. actually, the quantization distortion is heavily dependent upon the coding order of mbs

    在基於包的無線視頻傳輸中，最佳帶寬分配時，不僅要考慮信源編碼失真，也要考慮由於通道差錯引起的通道失真；已有的宏塊層碼率控制演算法以矩陣掃描的順序計算一幀中所有宏塊的量化參數，事實上量化失真與宏塊的編碼順序有很大關系，改變宏塊的編碼順序，使復雜的宏塊分配到更多的比特數，顯然能大大提高編碼效率。
  3. We study and analyze the problems of wireless asymmetric network applications using the original tcp / ip as system transport layer protocols. it is the high error rate in wireless asymmetric link, high - latency, tcp / ip performance deteriorated because of the asymmetric data streams that depressed the efficiency of the utilization coefficient of the wireless link

    分析了基本tcp ip作為系統傳輸層協議用於無線非對稱環境下存在的問題，主要是無線傳輸的高誤碼率、較大的延遲，及鏈路非對稱性導致的tcp ip性能惡化，從而降低了無線鏈路的利用率。
  4. To accord with the hierarchical organization of army, the its is organized with a 3 - layerd network structure. each layer is made up of several wireless self - organized subnets ( the top - level layer has only one subnet )

    為了適應部隊的分級編制，信息傳輸分系統採用三層組網結構，每一層由若干個（頂級網路只有一個）無線自組織子網組成。
  5. ( 1 ) for wireless physical layers, the efficiency function is defined to quantify the upper layer throughput per unit of wireless resources while maintaining a certain maximum remnant bit error rate subjected to a certain snr

    （ 1 ）針對無線物理層，引入效率函數來表徵在一定殘余誤碼率ber要求和一定通道信噪比snr情況下，上層應用正確傳輸的數據量和下層無線資源的關系。
  6. The content of this article is the research on the protocols for wireless communications on the media access control ( mac ) layer, which is a sublayer of the link layer, one of the five layers ( the physics layer, the link layer, the network layer, the transmission layer and the application layer ) which construct the stack of protocols for wireless communications. the emphasis of the research is on the applicability and superiority of two protocols on the mac layer

    本文的研究內容是mac （ mediaaccesscontrol ）層? ?無線傳輸的五層協議棧結構（物理層、鏈路層、網路層、傳輸層、應用層）中數據鏈路層的媒體接入控制子層? ?無線通信協議，重點研究兩種協議在傳感器網路應用中的適用性和優越性。
  7. We studied many methods to improve the tcp / ip in wireless environment, such as tcp / ip initial slow start algorithm, initial window and retransmission time out ( rto ) estimate. finally, we consider the round - trip time ( rtt ) with the physical layer and the transfer layer combined together. physical layer using rtt related to the channel state and transfer layer using the constant rtt, the interference between the two layers can be eliminated, and so the effectiveness of the wireless data link can be enhanced

    研究了tcp ip的慢速啟動演算法、初始窗口、重傳超時估計以及改善無線tcp ip性能的各種方法，提出了一種把物理層鏈路和傳輸層相結合處理往返時間（ rtt ）的方法：物理層鏈路採用與通道相關的動態rtt ，傳輸層採用常數rtt ，消除了兩層rtt之間的相互干擾，從而提高了無線鏈路的利用率。
  8. The six layers are : wireless physical layer, wireless data - link layer, network layer, transport layer, mobile computing application supporting environment, and application layer

    六個層次是：無線物理層、無線數據鏈路層、無線網路層、無線傳輸層、移動計算應用支撐環境和移動應用層。
  9. Wap includes a specification called wtls wireless transportation layer security which implements options for authentication and encryption. wtls ensures data integrity, privacy, and authentication and is optimized for use in the mobile environment

    無線應用系統規約包括一套名為無線傳輸層保安wireless transportation layer security ，簡稱wtls的規格，提供額外認證及加密的功能。
  10. Wap includes a specification called wtls ( wireless transportation layer security ) which implements options for authentication and encryption. wtls ensures data integrity, privacy, and authentication and is optimized for use in the mobile environment

    無線應用系統規約包括一套名為無線傳輸層保安（ wirelesstransportationlayersecurity ，簡稱wtls ）的規格，提供額外認證及加密的功能。該系統確保數據的完整性、私隱性及真確性，也專為流動通訊環境而設。
  11. We designed a wireless asymmetric physical layer link model with a direct sequence spread spectrum system as a transmitted reference. uplink and downlink are both one - way links connected by an ip tunneling. uplink is consisted with the narrowband radio data link of the warfighter information networks ( win )

    研究了無線非對稱鏈路，提出了一種用參考法直接序列擴頻（ dsss ）實現的無線非對稱數據傳輸的物理層鏈路模型：利用現有戰斗員信息網電臺的窄帶數據鏈作為上行通道，通過ip隧道技術保證單向鏈路的連通性。
  12. By utilizing the busy tones to realize the multicast reliability, rmac has three novelties : it uses a variable - length control frame to stipulate an order for the receivers to respond, thus solving the feedback collision problem ; it extends the usage of busy tone for preventing data frame collisions into the multicast scenario ; and it introduces a new usage of busy tone for acknowledging data frames positively

    例如， ieee 802 . 11 ，現今應用最廣泛的無線mac協議，僅在單播unicast通信方式下提供可靠數據傳輸服務，而對于組播和廣播兩種通信方式，它僅傳輸數據一次，即使數據傳輸出錯，也不會重傳。然而近幾年來，由於無線網路應用的蓬勃發展，人們逐漸認識到在mac層提供可靠組播服務是非常必要的。
  13. 1 ) realization of software packet embedded in m - es and md - is respectively to accomplish main function of mdlp, including assignment of tei ( temporary equipment identifier ), establishment of multiple frame operation, framing, flow control and error - free transmission of packets, is detailed. 2 ) a test model is established to evaluate the robustness and stability of mdlp and verify the validity of software packets. 3 ) according to the design of radio modem construction used in m - es, the modules of interface between data terminal equipment and radio modem are achieved to enable transmission of short message and continuous pseudo - random bit stream via rs232 uart

    本文首先概述了蜂窩數字分組數據網的結構和空中協議，詳細分析了移動數據鏈路協議，並在此基礎上，重點敘述了以下方面的工作： 1 ）設計並完成了分別應用於m - es和md - is端無線控制器的兩套程序實現數據鏈路層的主要功能，包括分配臨時設備號、建立鏈路、組幀和面向連接的服務保證分組正確無誤地傳輸，並進行適當的流控； 2 ）建立測試模型測試移動數據鏈路協議的可靠性和穩定性，證明了程序包的效用； 3 ）根據cdpd系統無線數據機的軟硬體總體設計方案，完成了介面模塊，實現了rs232異步串口通信，使用戶可以根據需要發送短消息或連續的偽隨機比特流； 4 ）在tms320c54x的軟體、硬體模擬平臺上，建立了cdpd試驗模型，實現了cdpd系統的mdlp基本功能。
  14. There are some differentiations in qos control of ( e ) gprs radio access network, which is the qos guarantee bottleneck of higher level traffic

    （ e ） gprs的無線接入網路的qos管理比較特殊，成為上層數據業務傳輸能否達到質量保證的瓶頸。
  15. Furthermore, this paper exploringly studies an 802. 1 la high - speed wlan with the 54mbps data rate, and presents a sort of time synchronization and frequency offset estimation method based on the frequency domain auto - correlation of the unique preamble training sequence of 802. 11 plcp frame ; the method have the high time precision, the wide frequency estimat ion range and short convergence process ; and moreover, it can applied to other frame communication system

    另外本文還對最高傳輸速率為54mbps的802 . 11a高速無線局域網系統進行了探索性研究，討論了ofdm調制技術在無線局域網中的應用；結合802 . 11a物理層數據幀結構特點，提出了一種基於前導訓練符號序列的頻域自相關時間和頻率同步方法，此方法具有定時精度高、頻偏估計范圍寬和同步建立迅速等特點，也適合於其它幀通信應用場合。
  16. After analyzing the features of domestic and abroad congener, i design and implement a mobile communication device including full ppp, upper tcp / ip, data - transport function and routing function

    本課題在分析了國內外同類嵌入式通信產品的特徵以後，設計並實現了一個包含完整的ppp協議及上層tcp / ip協議，具有無線數據傳輸功能和無線路由功能的嵌入式移動通信設備。
  17. Next, synthesizing the features of wired and wireless lan, a network structure based on combination of wired and wireless network is presented as network structure of on - board wirless comminucation system, alone with a discussion of problems on store and forward switching, enrolment of consumer, management of route control. call control and problems of network layer. at one time, design and realization of on - board wireless comminucation system are introduced combined with its feature

    其次，分析了有線局域網與無線局域網的特點，提出了一種基於有線無線異構網路作為車載無線數據傳輸系統的網路結構，討論了存儲轉發、用戶注冊、地址與路由管理和呼叫控制等網路層問題。並結合車載無線數據傳輸系統的實際特點，具體說明了車載無線數據傳輸系統的設計與實現過程。
  18. Firstly the paper makes a survey of the development of bluetooth technology in the internal and the external, explains charactoristic and application of bluetooth, points out the purpose and significance of developing bluetooth application. secondly, based on the sig bluetooth specification version1. 1, it analyses the wholesome framework of specification of bluetooth technology and the contents of the bluetooth protocol stack. thirdly, it discusses the wireless layer, baseband layer and hci in detail

    本文首先介紹了藍牙技術的國內外發展概況，簡述了藍牙技術的主要特點和應用，指出了開發藍牙應用的目的和意義；然後以藍牙規范1 . 1版本為基礎，論述了藍牙規范的完整框架和藍牙協議棧的具體內容，其中重點分析了傳輸協議組、中間件協議組和應用組；最後對低層的藍牙傳輸組中的無線層、基帶層和主機控制器介面進行了詳細的分析。
  19. In july 1998, the ieee standardization group selected the ofdm modulation technique for their new ieee802. 1l a standard, targeting data transmission from 11 up to 54 mbps. meanwhile, this new ieee standard is the first one to use ofdm in packet based communications. ( before the proposal of this standard, use of ofdm was limited to continuous systems ) in this paper, the author firstly presents the technical characteristics and the typical application of wireless local area network ( wlan ), analyzes its topology structure, the network configuration and etc. then the author illustrates the media access control and the operation and frame structure of physical layer

    1998年7月， ofdm技術正式被ieee標準組確定為ieee802 . 11a物理層調制方法，使得無線局域網數據傳輸速率由11mbps提高到54mbps ，性能得到明顯改善。同時該標準是第一個將ofdm技術應用於包傳輸通信中的ieee標準（在該標準提出以前， ofdm的使用通常局限於連續傳輸系統中） 。本文中，作者首先介紹了無線局域網的技術特點和典型應用，分析了其拓撲結構、網路配置功能等。
  20. The ped system is an ultra low frequency “ through the earth ” paging control and remote blasting system

    Ped井下無線通訊與急救系統是世界上唯一一套可實現超低頻信號穿透巖層進行傳輸的無線急救通訊系統。
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