code division multiple access 中文意思是什麼

code division multiple access 解釋
cdma
  • code : n 1 法典；法規。2 規則，準則；（社會、階級等的）慣例，習俗，制度。3 （電）碼，代碼，密碼，暗碼；...
  • division : n 1 分，分開，分割；分劃，區分。2 分配；分派。3 分裂，（意見）不一致，傾軋。4 區域；〈英國〉選區...
  • multiple : adj 1 多重的；復合的 復式的 多數的 多樣的。2 倍數的 倍。3 【電學】並聯的；多路的 復接的。4 【植物...
  • access : n. 1. 接近；會面。2. 捷徑，門路〈指方法、手段〉；檢查孔；進路，入口；【自動化】（存貯器的）存取。3. （病的）發作；（怒氣等的）爆發。4. 增加。
  1. Is - 95, a wireless digital cellular standard based on cdma ( code division multiple access ), adopts convolution code as its channel coding part. the third generation wireless cellular standard adopts turbo coding, which stems from convolution coding, as its channel coding part

    以cdma （ codedivisionmultiplexaccess ）為基礎的數字蜂窩標準is - 95採用卷積碼作為其糾錯方案;第三代數字蜂窩無線通信標準也採用并行級聯卷積碼（ turbo碼）作為其糾錯方案。
  2. 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。
  3. For wireless communications, direct sequence code division multiple access ( ds - cdma ) techniques have received a great deal of attention due to the expectation of capacity increase, interference rejection capability, security, and so on. in a high data rate application such as multimedia services, however, the capacity of ds - cdma systems is limited by both the inter - chip, or inter - symbol interference

    Cdma技術以其高抗干擾能力、高容量、高保密性等技術優勢在第三代移動通信系統中被廣泛應用，然而在高速數據業務中，嚴重的碼間干擾和符號間干擾會導致系統性能明顯下降。
  4. Code - division multiple access

    分碼多重擷取系統
  5. Uplink equivalent space - time multiuser detection for multicarrier code - division multiple access systems

    系統盲空時通道估計及多用戶檢測
  6. Uplink space - time channel blind estimation for space - time coded multicarrier code division multiple access systems

    空時編碼多載波碼分多址系統上行空時通道盲估計
  7. An advantage of convolutional coding is that it can be applied to a continuous data stream as well as to blocks of data. is - 95, a wireless digital cellular standard for cdma ( code division multiple access ), employs convolutional coding. a third generation wireless cellular standard adopt turbo coding, which stems from convolutional coding

    Cdma （ codedivisionmultipleaccess ）數字蜂窩標準is - 95採用卷積碼作為其糾錯方案，現在已經通過的第三代數字蜂窩無線通信標準（ 3g ）建議採用turbo碼作為糾錯方案，該碼也是屬于卷積碼。
  8. Code division multiple access

    分碼多重進接
  9. S - cdma synchronous - code division multiple access

    同步碼分多址方式
  10. S - cdma synchronous code division multiple access

    同步碼分復用
  11. Cdma, code division multiple access

    碼分多址
  12. 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。
  13. Code division multiple access ( cdma ) communications systems being possessed of the merits of great capacity and soft hand - off and so on must have taken a significant role in future wireless communications systems. because pn sequences used in communications systems are been vertical completely, when numbers of user are more, there are multiple access interference ( mai ) in cdma and serving quality in communications systems is reduced

    碼分多址（ cdma ）通信系統以頻譜利用率高、系統容量大、頻率管理容易，軟切換、移動臺發射功率低、通道的傳輸速率高等優點代表了新一代移動通信，在未來的無線通信系統中必將扮演極為重要的角色。
  14. 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。
  15. 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。
  16. Due to the data transmission characteristics between tags and reader, space division multiple access ( sdma ), frequency division multiple access ( fdma ) and code division multiple access ( cdma ) are applied in a limited way in rfid system. therefore, time division multiple ( tdma ) has been generally accepted. according to tdma, there are aloha protocol, s - aloha, binary - tree protocol, clipped binary - tree protocol and others

    解決這個問題必須要用到多路存取法，針對射頻識別系統中閱讀器與應答器之間的通信特點，空分多路法、頻分多路法、碼分多路法在rfid系統中應用都受到一定的限制，只能應用到一些特定的場合，一般採用時分多路法，按照時分多路法的演算法有aloha演算法、時隙aloha演算法、二進制樹型搜索演算法、修剪枝的二進制樹型搜索演算法等防碰撞演算法協議，分析了各自特點以及存在的缺點。
  17. On the other hand, cdma ( code - division multiple access ) communication system has been widely considered as the mainstream of 3g communication system, because it has the good qualities such as high utilization ratio of frequency band, low transmission power, powerful anti - multiple path falling and flexible capacity

    另一方面， cdma通信系統以其高頻譜利用率、低發射功率、強抗多徑衰落特性、軟容量等優點，已被廣泛認為是第三代移動通信系統的主流。
  18. 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。
  19. 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。
  20. 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。
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