multiple access communication 中文意思是什麼

multiple access communication 解釋
多址通信
  • 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。
  • communication : n. 1. 通訊，通知；交換；信息；書信，口信，通報。2. 傳達，傳授；傳播；傳染。3. 交通，交通機關；聯系，連絡（設備）。4. 【宗教】接受聖餐。
  1. Designers worldwide are working on local - access approaches using time - division multiple - access ( tdma ) technology. examples include using passive optical networks ( pons ) to realize fiber to the home, fiber to the curb. with the advent of the interactive services such as vod ( video on demand ), the communication traffic from subscriber to central office are increasing significantly

    各國的設計人員都在進行使用時分多址（ tdma ）技術的本地接入方式的研究工作，例如在本地接入方式中，利用工作于突發模式的無源光網路（ pon ）實現光纖到用戶、光纖到路邊的連接。
  2. Power control and multiuser detection are two key technique to cope with the multiple access interference and near - far effect in cdma mobile cellular communication systems, power control is a resource allocation technique that balances the received powers of the users so that no one user creates excessive interference

    功率控制和多用戶檢測是cdma移動通信系統中克服遠近效應、多址干擾的關鍵技術。功率控製作為一種可以平衡接收功率，減小對其他用戶干擾的技術得到廣泛的應用。
  3. The smart antenna, which is adapted in the wireless mobile communication system, in fact, forms an antenna with a high gain. thus communication in all directions can be proceeded, then base station antenna coverage, system capacity and service quality are improved, also inter - symbol interferes and multi - access interfere are reduced. the space division multiple access ( sdma ) is introduced, and users can be distinct from each other through their special location

    在無線移動通信系統中採用智能天線技術，實際上是通過數字信號處理，使天線陣為每個用戶自適應地進行波束賦形，相當于為每個用戶形成了一個可跟蹤它的高增益天線，從而即可以進行全方位通信，也可以用較小的發射功率覆蓋相同的范圍以及提高系統容量和業務質量、降低用戶間的碼間干擾和多址干擾。
  4. The directional routing protocol ds _ dsr put forward by the author is the improvement of the current protocol dsr, complete routine discovery and maintenance by directional neighbor nodes routing table, source routing and directional steering. the research discovers the application of the directional antenna, compare the omnidirectional antenna can increases the networks " total throughput, obviously reduces the co _ channel interference ( cci ), multiple access interference ( mai ), enlarges the nodes " signal and interference to noise ratio ( sinr ), and because of the high gain of directional antenna can realize the communication with farther distance and less jump, end to end delay can decrease deeply, simultaneously, security of networks can be improved partially, the node energy also can be saved easily by power control

    本文提出的定向路由協議ds _ dsr是基於對現有協議dsr的改進下實現的，通過定向鄰節點路由表、定向源路由和定向搜索來完成路由發現與維護。研究發現，定向天線的應用，相比全向天線可明顯提高網路的總的吞吐量，減少通道干擾、多址干擾，提高信干噪比，且由於定向天線的高增益可實現較遠距離、較少跳數的通信，減少了路由發現時間，這樣大大減小了傳輸時延，網路的整體性能得到了不同程度的提高，同時部分地解決安全問題，通過功率控制還可較容易的實現節能的目的。
  5. The paper contains all kinds of knowledge related to the system, including maxwell electromagnetic theory, pattern of optical radiation in space, channel model of atmosphere communication, computer communication protocols, wireless lan communication protocols, medium access control protocol, carrier sense multiple access / collision detection protocol, manchester coding theory, pulse position modulation coding theory and so on

    主要包括： maxwell電磁理論；發送光場模型；空間通道模型；計算機網路通信技術：無線局域網通信技術；媒體訪問控制規程（ mac ） ；載波檢測多址接入碰撞檢測規程（ csma cd ） ；曼徹斯特編碼與ppm編碼技術等。
  6. 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。
  7. Contributions in this paper mainly sh ow four points : 1 the structure characteristic of the received ds - cdma signal is analyzed in the presence of multi - path slow fading effect case for wireless mobile communication. according to this characteristic, four data - selected schemes based on chip - matched filter are presented from the perspective of energy and structure of signal. and the impact of these schemes on multiple - access interference ( mai ) and inter - symbol interference ( isi ) is analyzed

    本文的主要貢獻在於四個方面： 1 、針對無線移動通信系統中廣泛存在多徑慢衰落效應的情況，分析了ds - cdma系統中接收信號本身的結構特徵，根據這個特徵，在匹配濾波的基礎上，從能量與信號結構的角度提出了四種不同的數據採用方案，並分析了不同數據方案對多址干擾與碼間干擾的影響。
  8. Icao make a standard of very high frequency data link mode 4 ( vdl mode 4 ) on the basis of self - organizing time division multiple access ( s - tdma ), this standard is considered to be one of the basic solutions of aviation mobile communication

    該標準基於自組織時分多路訪問技術，其主要特點是:支持實時應用，採用短消息進行信息交換，並且可以在缺少地面基礎設施的情況下保障空空通信。
  9. 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。
  10. 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。
  11. 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。
  12. Combining walsh sequence with direct spread spectrum sequence, we can construct hybrid ds - fh spread - spectrum communication mode. this is very important for the mode to have better performance on anti - multiple - access inference and anti - near - far inference

    將walsh函數序列與直接擴頻序列相結合構成的ds - fh混合擴頻通信方式對于系統抗多址干擾和遠近效應具有重要意義。
  13. Since most of the 3g systems are evolved from different incompatible 2g systems like cdma code division multiple access, gsm global system for mobile communication and tdma time division multiple access, therefore the imt - 2000 standard will ensure the compatibility and interoperability of different systems in 3g. 3g is broadband and packet - based

    由於大部份3g系統是由多種不能兼容的2g系統，如碼分多址code division multiple access ，簡稱cdma ， gsm及時分多址time division multiple access ，簡稱tdma制式演進過來的，因此， imt - 2000標準是要保證3g系統所包含的各種程式的兼容及互用性。
  14. Multiuser detection algorithm for ultra wideband multiple access communication systems

    多址通信系統多用戶檢測演算法
  15. Direct sequence spread spectrum ( ds ) signals have been widely used for secure communication and mobile communication known as code division multiple access ( cdma ) system. because ds signals have many advantages such as anti - jamming capability, low probability of interception, multiple access capability and so on

    直接序列擴頻通信具有低截獲概率，抗干擾能力強以及實現碼分多址等優點，因而在抗干擾通信及民用移動通信中得到廣泛的應用。
  16. Civil air defense alarm system was a system to dispense antiaircraft alarm sig - nal, hand hostile air attack informational communication to urbanite at wartime. it is a particular informational communication system of the civil air defense depart - ment, and can not be taken place. at the development trend of digitaliza - tion, unitization, integration of civil air defense communication, the civil air defense alarm system is developing too, for adaptation to the require of both future war and peaceful dual, and enhancing civil air defense communication system ' s directing automation. in recent years, development of different kinds of communication technology infuses new clearly energy into communication, especially spread spectrum communication, because of its strongly interference - free feature, invisibility best, realizable code division multiple access and antimultipath wane and so on merit, gets extensive use at wireless region ; the corresponding spread spectrum chips emerge as the times and get boom, which provides advantag e to realization of the circuit of spread spectrum communication. at the same time, in company with the advance of electronics level, the single chip microcomputer has a great development, world renowned chip manufacturer pushout respective products one after another, the kinds of which are too many to statiste

    在人防通信的數字化、一體化、綜合化必然的發展趨勢下，人防警報系統也不斷發展，以適應未來戰爭和和平時期的雙重需要，提高人防通信系統指揮自動化。近年來，各種通信技術的發展給通信注入了活力，擴頻通信更因其抗干擾能力強、隱蔽性好、可實現碼分多址和抗多徑衰落等優點在無線領域得到了廣泛應用；其相應擴頻處理晶元應運而生並得到迅速發展，這為擴頻通信的電路實現提供便利。同時隨著微電子工藝水平的提高，單片微型計算機有了飛躍發展，世界上著名的集成電路晶元製造商紛紛推出各自的產品，單片機型號之多，已達到難以統計的地步。
  17. Firstly this paper researches present mobile communication technique of enhancing system capacity, next further researches basic principles of tdma and cdma system. based on these researches a new scheme is proposed that let broadband code division multiple access ( b - cdma ) system overlay on an existing narrowband digital cellular system ( i. e. gsm )

    本文首先研究了移動通信現有的擴容技術，其次深入研究了tdma系統和cdma系統的基本原理，在此基礎上提出了利用gsm與寬帶cdma系統同頻傳輸實現系統擴容的方案。
  18. Spread spectrum technique is brought forward originally in military communication for antijam and low probability of intercept. it ' s capability in security and antijam makes its expensive applications in the fields of communication and detection. application in multiple access communication techniques accelerates nowadays - 3g technique

    擴頻技術最早是在軍事通信中為了抗干擾和降低截獲概率而提出來的，它的保密、抗干擾性能使它在通信和探測領域得到廣泛的應用，擴頻技術應用於多址通信（碼分多址）使得當今的移動通信和3g通信等技術得以快速蓬勃的發展。
  19. This paper discusses the work that we have done about the ( cd ) 2ma ( chaotic digital code - division multiple access ) communication system, whose performance is desirable

    本文論述了我們在研究性能優良的混沌數字碼分多址通信系統方面所做的工作。
  20. Generally, in the cdma ( code divide multiple access ) communication system, we take the m and gold sequences as the pn ( pseudonoise ) code

    在cdma （碼分多址）通信系統中，通常所用的偽隨機碼為傳統的m序列， gold碼等。
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