碼多分址 的英文怎麼說

中文拼音 [duōfēnzhǐ]
碼多分址 英文
cdma code division multiple access
  • : 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
  • : 名詞(建築物的位置; 地基) location; site; ground; foundation
  1. Cdma cellular system

    蜂窩系統
  2. 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( 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。
  3. 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系統中的編解技術方案進行研究。
  4. 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

    本文在技術和正交載波技術原理基礎上,析了高斯白噪聲通道中載波( mc - cdma )系統的數學模型,並且使用不同的擴展對下行通道和上行通道誤率性能別作了計算機模擬析。
  5. Several technologies researched and applied in research of the thesis which includes the technique of electric energy measurement, the remote and automatic reading meter, gprs, embedded system and remote update application in terminal. the system has advantage of execution efficiency, software cubage, and response speed and communication expense

    終端系統的設計基於嵌入式系統,充利用了嵌入式操作系統的任務能力、模塊可裁剪能力,嵌入式處理器的速度快、尋能力強和資源豐富以及gprs網路永遠在線、通信費用低廉等優勢,在執行效率、代體積、通信處理能力和經濟效益上都有著強大的優勢。
  6. In this dissertation, the researches on the application of cdma in fiber - optic communication systems have been reviewed, and several key techniques in the application are proposed with theoretical analysis. in traditional researches and applications of the hfc cdma communication system, the gold sequence was used as the users " address code. in this paper, we analyze the characteristics of the m sequence in detail

    本文突破了以往在hfc系統中使用cdma擴頻技術通信時,通常都採用gold序列來作為地的慣例,析和提出了在hfc的特定環境中,使用同一m序列在某時刻具有的不同相移序列,來構成一個小區的地,能夠達到用戶通信時比使用gold序列進行通信具有更好的相關特性。
  7. Traditional multiuser detector make good use of all signals which resuilt in multiple access interference so that it provides optimum mai resistance. ( 1 ) nevertheless, it assumes that the receiver can acquire the signature waveform and timing of desired user and the interfering users ; ( 2 ) it has no ability to suppress intercell multiple access interference ; ( 3 ) it cannot be applied in downlink channels. adaptive multiuser detector eliminates the need to know the signature waveforms and the timing of the interferes and has to need training data sequences for every active user

    傳統用戶檢測在單用戶檢測技術基礎上,充利用造成干擾的所有用戶的信息進行聯合檢測,從而具有良好的抗干擾能力,但存在一些缺陷: ( 1 )不僅要求知道期望用戶的地pn及其定時信息,還要求其他干擾用戶的地pn及其定時信息; ( 2 )不能消除其他相鄰小區的干擾對本小區的影響; ( 3 )不能直接應用在cdma移動通信系統中的下行鏈路。
  8. 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-( 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:一個是干擾造成的性能下降;另一個則是遠近效應問題。
  9. In this thesis, first, we present the theory of sess system, the generation of the sess spreading code and its characteristics and the acquisition theory of conventional spread spectrum communication system. an efficient acquisition scheme based on periodically transmitting the synchronization head, which is composed of binary chaotic codes, using the matched filter and automatic decision threshold - level control based on a so - called constant false alarm criterion for sess system is present. the acquisition model of sess system is built and simulated in the awgn channel, the raleigh fading channel and imulti - address interfere condition

    本文首先概述了自編擴頻通信的原理、自編擴頻序列的產生方法及其特性和擴頻通信系統編同步的理論,然後針對自編擴頻通信系統提出了擴頻序列捕獲方案:周期性地加入混沌序列同步,並採用恆虛警率匹配濾波器捕獲法;在加性白高斯噪聲通道、瑞利衰落通道和干擾情況下進行了模擬,析了各種捕獲性能:在選擇性能最優的混沌序列、適當的序列長度、虛警概率及門限值的情況下,可以獲得較短的捕獲時間和較大的捕獲概率。
  10. Uplink space - time channel blind estimation for space - time coded multicarrier code division multiple access systems

    空時編載波系統上行空時通道盲估計
  11. Evm measurement algorithm for td - scdma ue conformance test based on iterative process

    基於迭代的時同步系統終端誤差矢量值一致性測試演算法
  12. 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

    技術逐漸成為新一代通信系統的主流技術,如何在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
  13. By using the de - interleaving memory combined with memory address computation for the interleaved data, frequency de - interleaving, block de - interleaving and time de - interleaving are performed in one - stage approach in the cofdm receiver

    藉由利用反交錯記憶體結合對該記憶體存取位的計算,頻域反交錯、區塊反交錯與時域反交錯在正交編工接收器中以單一階段技術來執行。
  14. Spreading codes ensure the mc - cdma a multiuser system

    擴頻保證系統為一個系統。
  15. S - cdma synchronous - code division multiple access

    同步方式
  16. A 3 - d code for ocdma system

    用於光系統的一種3d地
  17. A policy of call admission control in wideband ds - cdma system

    寬帶直擴系統中的一種呼叫允許控制策略
  18. Cdma is a kind of advanced wireless spread spectrum technique

    技術( cdma )是一種先進的無線擴頻技術。
  19. 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 )和預約接入rcma ,並對其性能進行了析。
  20. Then, memory cell array and some parts of peripheral circuits used in sram, for example, sense amplifyier and adderss decoder, are designed and verifyied by simulation. furthermore, some novel methods, such as clocked hierarchical word decoding structure, multi - stage sense amplifyier, common data line and data bus equlibruim technology has been applied in the design of 128kbit and imbit sram. what ' s more, we have studied compiler technology applied in the designing course of a imbit full cmos sram from the pointview of methology

    然後對sram的存儲單元電路以及外圍電路中的靈敏放大器和地器進行了設計和模擬,在此基礎上,以128kb和1mb全cmossram設計為例,從方法學角度對同步sram設計中的帶時鐘等級字線譯級靈敏放大和位線及總線平衡等技術進行了研究,並給出了相應的compiler演算法。
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