碼分多址接入 的英文怎麼說

中文拼音 [mǎfēnduōzhǐjiērù]
碼分多址接入 英文
cdma: code division multiple access
  • 碼 : Ⅰ名詞（表示數目的符號或用具） a sign or object indicating number; code Ⅱ量詞1 （指一件事或一類的...
  • 分 : 分Ⅰ名詞1. （成分） component 2. （職責和權利的限度） what is within one's duty or rights Ⅱ同 「份」Ⅲ動詞[書面語] （料想） judge
  • 址 : 名詞（建築物的位置; 地基） location; site; ground; foundation
  • 接 : Ⅰ動詞1 （靠近;接觸） come into contact with; come close to 2 （連接; 使連接） connect; join; put ...
  • 入 : Ⅰ動詞1 （進來或進去） enter 2 （參加） join; be admitted into; become a member of 3 （合乎） conf...
  • 接入 : insert; join up; switch on; cut over; turn on; switch in; reset; put in; place in; cut in; throw ...
  1. With the trend that cdma will be the dominant multi - access scheme in the new generation of wireless communication, how to apply spatial processing in cdma system has been becoming the emphasis of research in smart antenna. a proper method is space - time processing due to the space - time structure of wireless channel. beamforming can be combined with rake to form 2d rake receiver, which can effectively weaken the enhancement of mai in conventional rake receiver. however a more effective method is to use space - time filtering. these two scheme will be discussed and the structure and realization will be presented

    碼分多址技術逐漸成為新一代通信系統的主流多址技術，如何在碼分多址系統中引入空域處理以改善系統性能是當前智能天線技術研究的重點之一.考慮到無線通道的時空二維結構特徵，一種合理的實現方式是採用時空處理方法，將波束形成技術與時域分集技術相結合;另一種更有效的方法是在接收端採用時空二維聯合處理，對無線通道進行時空二維均衡
  2. In code - division multiple - access ( cdma ) systems, the auto - and cross - correlation properties of the spreading sequences employed play an important role on the level of the self - interference ( si ), multiple access interference ( mai ) and adjacent cell interference ( aci ), and therefore directly influence the performance and capacity of the systems

    在碼分多址（ cdma ）系統中，擴頻序列自相關和互相關特性的好壞在很大程度上決定了系統自干擾（ si ） 、多址接入干擾（ mai ）和鄰區干擾（ aci ）的大小，從而直接影響著系統性能優劣和容量大小。
  3. Optical code division multiple access ( ocdma ) technology possess the characteristics of combating interference, high frequency efficiency, security, and simply network protocol, random access, so it is competitive to apply ocdma to wireless optical access network

    光碼分多址（ ocdma ）技術具有的抗干擾能力強、頻率利用率高、保密性好、網路協議簡單、支持隨機接入等優點，將其應用到無線光接入網中，不僅具有cdma技術的優點又保持了無線光通信的優點，實現二者優勢互補。
  4. Providing a novel access scheme for solving “ last mile ” wideband access and global person communications. in wireless optical code multiple access ( w - ocdma ) network, media access control ( mac ) is a key issue, which determines network performance 、 bandwidth efficiency 、 complexity and cost of terminal

    無線光碼分多址（ w - ocdma ）接入網中，數據鏈路層的媒質接入控制技術（ mac ）至關重要，它直接影響網路的性能、帶寬利用效率、終端設備的復雜度和成本。
  5. Conventional detector ( single - user matched filter ) distinguishes each user by the crosscorrelation of their spread - spectrum codes. in practice, however, its performance is much deteriorated due to the existence of noise in channel and strong multi - access interference, i. e. near for effect. a new method using independent component analysis is proposed in this paper. the - received energy of signals is controlled effectively, thus the near - far effect is overcome as much as possible ; moreover, the effect that noise imposed on the detector is mostly reduced. simulations verify the effectiveness of this method

    傳統檢測器（單用戶匹配濾波）利用擴頻碼之間的互相關特性來區分各用戶信號.而在實際應用中，通道噪聲和近距離用戶對遠距離用戶的強多址干擾即遠近效應，使得接收機的性能受到很大影響.本文將獨立分量分析法引入傳統接收機，有效控制接收信號的能量，從而極大地提高了接收機的抗遠近性能，同時噪聲的影響被盡可能消除.模擬結果表明了該方法的有效性和可行性
  6. Chapter 1 introduce the concepts of broadband access netwotks, integrated services, qos, multiple - access protocols and cdma

    第一章介紹了幾種目前流行的寬帶接入網技術以及寬帶業務，服務質量，多址接入協議和碼分多址技術。
  7. Proposes a novel channel estimation algorithm for multi - carrier code division multiplex access ( mc - cdma ) systems on the uplink

    摘要提出了一種新穎的適用於多載波碼分多址接入（ mc - cdma ）系統上行鏈路的通道估計演算法。
  8. Owing to its proximity to the mainland, coupled with tariffs - free arrangement under cepa, hong kong manufactures have gained a head - start in entering the mainland market. moreover, the mainland is developing its own standards such as avs, wapi, td - scdma, and hdtv standards

    此外，內地正訂立多項國家標準，例如數字音視頻編解碼技術標準（ avs ） 、無線局域網加密標準（ wapi ） 、時分同步碼分多址接入標準（ td - scdma ）及高清晰度電視標準（ hdtv ）等。
  9. The trust relationship of entities and security issues involved in the integration operation are also detailed. finally, the authentication framework of integration of code division multiple access 2000 and wireless local area network is furthered. some security vulnerabilities of the framework are identified and a novel solution is proposed to enhance the security

    本論文在這一方面討論了互通的基本框架和標準的現狀，考察了其中存在的安全問題和參與實體的信任關系，並就碼分多址接入技術和無線局域網接入技術的互通認證框架進行了深入分析，指出其不安全的因素，並提出了解決方法。
  10. Cdma ( code division multiple access ) is a promising technology for future mobile communication system because of its several features with which other multiple access technology can not compare : higher efficiency of frequency allocation, robust anti - multipath effect, macro diversity, mitigating interference, soft capacity, low power, soft handoff, simple frequency design, easy access, and so on

    碼分多址接入（ cdma : codedivisionmultipleaccess ）方式以頻譜利用率高、抗多徑、抗干擾、軟容量、低功率、軟切換、宏分集、頻率規劃簡單、用戶接入方便等其它多址技術不可比擬的優越性被認為是未來移動通信系統的理想接入技術之一。
  11. Cdma ( code division multiple access ) is one of the promising technology for futufe mobile conununication system because of its several featurs with which other multiple access technology can not compare : higher efficiency of frequency allocation, robust ani - multipath effect, macro diversity mitigating intefference, soft capacity low powet, soft handoff simple frequency design, easy access, and so on

    碼分多址接入（ cdma ： codedivisionmultipleaccess ）方式以頻譜利用率高、抗多經、抗干擾、軟容量、低功率、軟切換、宏分集、頻率規劃簡單以及用戶接入方便等其它多址技術不可比擬的優越性被認為是未來移動通信系統的理想接入技術之一。
  12. At the mean time, the building of the system is the fastest and the best convenience. the scdma making use of radio connection technology of scdma have advantage of high radio frequency ratio, good secrecy and long distance of transport under lower transmitter frequency

    Scdma無線接入通信系統採用同步碼分多址（ scdma ）無線接入技術，具有無線頻譜利用率高、通信保密性好和低發射功率下較遠的通信距離等技術優勢，是一種優秀的無線接入通信技術。
  13. Optical code division multiple access ( ocdma ) is a communication mode which introduces the code division multiple access ( cdma ) technology into optical fiber communication system. besides providing asynchronous communications access, ocdma system has many advantages, such as high capacity, security against interception, suppression of narrow band disturbances, capability in forming variable bit rate networks and multi - rate networks. it implies a great challenge for the development of future communication networks, especially all optical networks

    光碼分多址（ ocdma ）是將碼分多址（ cdma ）技術與大容量的光纖通信技術相結合的一種通信方式，其主要優點表現在如下幾個方面：允許多個用戶隨機地接入同一通道：可構成真正「透明」的全光通信網路；具有良好的安全性；允許可變速率或多速率傳輸，並可同時提供多種業務支持；具有優良好的抗干擾能力，並能夠充分地利用石英光纖的可用帶寬。
  14. In order to combine the virtues of reservation anoha and cdma, we bring forward the spread aloha ( sana ) protocol and reservation code multiple - access ( rcma ) protocol and analysis their performance

    為了結合aloha和cdma的優點，在aloha和prma的基礎上提出了擴展aloha （ sama ）和預約碼多址接入rcma ，並對其性能進行了分析。
  15. Synchronous cdma ( scdma ) system is a wireless communication system using smart antenna, synchronous cdma, swap ? ( synchronous wireless access protocol ) and it is implemented on software radio architecture

    Scdma （同步碼分多址）系統是使用智能天線、同步碼分多址和swap ~ （ tm ） （同步無線接入信令規范）信令、用軟體無線電實現的無線通信系統。
  16. Concerning with the direct sequence ( ds ) cdma system, this thesis focuses on several issues related to orthogonal spreading sequences and amc, including correlation properties of orthogonal variable - length spreading sequences and their effects on ds cdma system performance, performance of multicarrier ( mc ) ds cdma system with generalized orthogonal ( go ) sequences, adaptive modulation with throughput maximization, performance of adaptive turbo - qam coded modulation in generalized fading channel and performance of amc in wcdma high speed downlink packet access ( hsdpa )

    針對直接序列碼分多址（ dscdma ）系統，本文主要研究了正交擴頻序列和自適應調制編碼若干問題，包括正交變長擴頻序列的相關性及其對dscdma系統性能的影響、採用廣義正交（ go ）序列的多載波直接序列碼分多址（ mcdscdma ）系統性能、吞吐量最大化自適應調制、自適應turbo - qam編碼調制在廣義衰落通道中的性能，以及wcdma下行分組接入（ hsdpa ）中自適應調制與編碼性能五個方面。
  17. Besides, this paper studies the wireless optical code division multiple access ( w - ocdma ) technology whereas its anti - jamming, security and asynchronism. based on the w - ocdma communication technology, we analyzes ocdma mac protocol, studies the protocol theory, access mechanism in detail, and models the throughput performance, simulates and analyzes the performance

    （ 3 ）鑒于無線光碼分多址（ wirelessopticalcodedivisionmultipleaccess ， w - ocdma ）技術的抗干擾、保密和隨機異步接入的優點，本文分析了基於ocdma接入的無線光局域網mac協議，闡述了協議原理和接入機制，用馬爾可夫模型對吞吐量性能進行了建模和模擬計算。
  18. For example, hong kong is the first metropolitan area to have the telephone network digitized in the early 90 s, the first to adopt the cdma standards in the world, the first in asia to launch multi - media messaging services ( mms ) and one of the first to introduce general packet radio services ( gprs )

    舉例來說，在九十年代初期，香港是首個把電話網路數碼化的都會區，亦是首個採用碼分多址聯接制式（ cdma ）標準的地區。此外，我們也是首個推出多媒體訊息服務（ mms ）的亞洲地區，以及其中一個最先引入通用分組無線電服務（ gprs ）的地區。
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