碼分多址技術 的英文怎麼說

中文拼音 [mǎfēnduōzhǐjìshù]
碼分多址技術 英文
cdma
  • 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
  • 技 : 名詞（技能; 本領） skill; ability; trick; technique
  • 術 : 術名詞1. （技藝; 技術; 學術） art; skill; technique 2. （方法; 策略） method; tactics 3. （姓氏） a surname
  1. They are increasingly replacing conventional communication forms and obtaining extensively applications in modern military and commercial communication systems, for example, cdma communication system, gps, measuring and control system, satellite chain, identification of friend or foe and etc. therefore, corresponding dsss electronic counter technique becomes a big problem to solve in electronic warfare domain

    正日益取代常規通信而廣泛應用於現代軍事和商用通信系統中，如碼分多址（ cdma ）通信、全球定位系統（ gps ） 、測控、衛星鏈路和敵我識別等。因此，與之對應的直擴通信對抗技術也就成了通信對抗領域亟待解決的問題。
  2. The main research work of this thesis is focused on the encoding and decoding technologies in the optical code divison multiplexing access system

    本文主要針對一維和二維光碼分多址系統中的編解碼技術方案進行研究。
  3. In this paper, after introduction of the code division multiple access ( cdma ) and orthogonal multicarrier ( mc ) technique, the system model of mc - cdma is analyzed and the bit error rate ( ber ) performance in downlink and uplink channel is shown in awgn channel by computer simulation

    本文在碼分多址技術和正交多載波技術原理基礎上，分析了高斯白噪聲通道中多載波碼分多址（ mc - cdma ）系統的數學模型，並且使用不同的擴展碼對下行通道和上行通道誤碼率性能分別作了計算機模擬分析。
  4. Direct sequence - code divition multiple access ( ds - cdma ) technology is achieved easily and used widely at present its receiver capability is confined by two factors, one of which is the multiple access interference ( mai ) which makes the capacity low, another of which is the near - far problem

    直接序列擴頻-碼分多址（ ds - cdma ）技術是最易實現、也是目前應用最廣的一種方式，它的接收性能受到兩個主要的限制：一個是多址干擾造成的性能下降；另一個則是遠近效應問題。
  5. 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
  6. Cdma is a kind of advanced wireless spread spectrum technique

    碼分多址技術（ cdma ）是一種先進的無線擴頻技術。
  7. 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。
  8. General specification of satellite communicalion earth station for shipborne communication equipment for cdma

    衛星通信船載地球站碼分多址通信設備通用技術條件
  9. 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。
  10. Code division multiple access ( cdma ) has rapidly become a leading technology for commercial cellular systems because it has large capacity, good voice quality and big potential of upgrading etc. in 1996, china began the commercial trial of cdma cellular communication network in four cities, beijing, shanghai, guangzhou and xi ' an

    基於cdma （碼分多址）技術的數字蜂窩系統由於具有容量大、音質好、升級潛力大等優點，贏得了廣大消費者及運營商的青睞，在世界各地也得到了越來越廣泛的應用。 1996年，我國首先在北京、上海、廣州和西安四城市進行了cdma網的商用試驗。
  11. 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。
  12. The basic theory, system scheme and key technology of ocdma technology are introduced in the first chapter. the advantages and the future development of ocdma system. are summarized

    論文首先對光碼分多址技術的基本原理，系統方案以及關鍵技術進行了介紹，並對ocdma系統的優點以及發展前景進行了總結。
  13. Code - division multiple - access ( cdma ) technology has become the main technology studied in the personal communication service ( pcs ) recently because it has lots of benefits, such as large system content, high voice quality, easy frequency scheme, low cost of the net making and so on

    碼分多址技術因其具有系統容量大、語音質量高、頻率規劃簡單、建網成本較低等眾多優點，已成為近年來個人通信業務中研究的主要技術。
  14. Now cdma is very mature and becomes the key technique of the third - generation mobile communication systems. more and more attention is paid to the technique of multi - carrier. mc - cdma is combination of ofdm and cdma, thus advantages of both techniques are exploited

    近年來移動通信技術發展迅猛，碼分多址技術到目前已經非常成熟，並成為了第三代移動通信系統的核心，人們將眼光聚集在正交頻分復用調制技術，將多載波調制技術應用於cdma中，從而兼具多載波技術和cdma技術的優點。
  15. The researching work of this thesis is mainly about the encoding and decoding schemes of the arrayed waveguide gratings and the bragg fiber gratings systems. firstly, the basic principle, system schemes and the key technologies are introduced in section one. the development, research status and trends of ocdma technologies are also summarized

    本論文的第一章對ocdma系統進行了較為全面的綜述，對光碼分多址技術的基本原理和分類、編解碼結構方案以及關鍵技術進行了介紹，並對光碼分多址技術的發展和現狀進行了概述。
  16. Firstly, the basic principle of ocdma, the basic theory of ooc and the key technologies of ocdma are introduced. the development, research status and trends of ocdma technologies are also summarized. combining with other multiplexing technologies and using fiber gratings as the encoder / decoder are the trends of ocdma system

    論文首先對ocdma的基本原理、光正交碼的基本理論以及關鍵技術進行介紹，對光碼分多址技術發展歷史、研究現狀以及發展趨勢進行總結，指出同其它復用方式相結合的混合全光網路和採用光纖光柵編解碼器是光碼分復用技術最有希望的發展方向。
  17. 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。
  18. 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。
  19. 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。
  20. 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。
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