spread spectrum multiple access 中文意思是什麼

spread spectrum multiple access 解釋
擴展頻譜多址
  • spread : vt （spread）1 伸開，伸長（手臂等），展開，張開（帆等），打開（地圖等）；鋪開（氈子等），展寬，展...
  • spectrum : n. （pl. -tra ）1. 【物理學】譜，光譜；波譜；能譜，質譜。2. 【無線電】射頻頻譜；無線電（信號）頻譜。3. 【心理學】（眼睛的）余像；殘像。4. 〈轉義〉范圍，幅度；（連續的）系列。
  • 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. 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。
  2. 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。
  3. 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。
  4. 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。
  5. Spread spectrum communication takes an important part in military communication and in civil communication. especially in recent years, code - division multiple access ( cdma ) system based on spread spectrum communication is widely used in mobile communication

    擴頻通信在軍事通信和民用通信中都具有重要的意義，特別是近幾年來，以擴頻通信為基礎的cdma通信系統在移動通信中得以廣泛應用。
  6. Multicarrier wireless communications have been widely investigated in the past decades. recently, two - dimensional spread spectrum ( 2d - ss ) system has drawn a lot of attention because of its full utilization of spreading characteristics in the frequency domain and time domain. compared with multicarrier code division multiplex access ( mc - cdma ), 2d - ss system can effectively mitigate multiple access interference ( mai ) due to spreading in the time domain

    當前多載波無線通信技術得到了廣泛的研究，二維擴頻通信系統是近年來提出的新的擴頻通信方式，由於二維擴頻系統從時域和頻域上分別對數據信號進行頻譜擴展，因此它同時具有時域擴頻和頻率擴頻通信系統的特點，是對傳統的一維時域直接序列擴頻和多載波擴頻的推廣。
  7. Spread spectrum code division multiple access technique ( ss - cdma ) has successfully been applied in the second generation mobile communication system, such as is - 95. moreover, the main technique of the third generation mobile communication system is also based on cdma

    擴頻碼分多址已成功地應用於第二代移動通信中，如is - 95 ，而且第三代移動通信的主要方案也都是基於碼分多址cdma ，因此cdma技術具有無可爭辯的競爭力。
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