spread spectrum transmission 中文意思是什麼

spread spectrum transmission 解釋
寬頻帶傳輸
  • 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。
  • transmission : n 遞送；傳遞；傳達；傳染；移轉；【機械工程】傳動；傳遞；變速器；聯動機件；【無線電】傳送；發射；...
  1. This paper mainly focuses on the noise limiting by means of the direct sequence spread spectrum ( dsss ) and the analysis of the transmission performance of the plc and some digital modulation technology. the contents of the paper is as follows : 1 ) the technical feasibility is proved after simulating noise limiting principle of dsss by means of systemview, the simulation software ; 2 ) a kind of band pass filter ( bpf ) is realized according to the requirement of filter and the principle of butterworth approximation, which satisfies the index of performance of dsss. 3 ) the low voltage plc system includes the sc1128, the specific modulation / demodulation ic, the bpf filter and other circuit components, furthermore, the control function of system is realized by means of the personal computer and the microcontroller

    本課題在對低壓電力線的傳輸特性和數字調制技術進行分析的基礎上，將通信理論中的直接序列擴頻技術（ dsss ）用於解決低壓電力線通信的干擾問題，主要研究內容如下： （ 1 ）用通信模擬軟體systemview對dsss技術的通信和抗干擾原理進行模擬分析，分別對時域和頻域下採用dsss技術前後接收信號的頻譜進行分析，驗證dsss技術在本系統中的可行性； （ 2 ）由dsss技術對濾波系統的要求，根據濾波理論分析了巴特沃思型濾波器的逼近原理並設計了合適的濾波電路； （ 3 ）用調制解調晶元sc1128和自行設計的濾波器加之輔助外圍電路，構造出低壓電力線載波通信系統，並採用atmel公司的單片機設計了接收和發射電路的微控制器； （ 4 ）分別對採取抗干擾措施前後輸入和輸出信號進行對比實驗，並對結果進行分析，驗證了dsss技術對干擾信號的抑制作用。
  2. This paper presented a general systematic view, application and current development of the power line carrier transmission technology, and clearly compared some existing power line carrier communication chip with each other. then the authors analyze the channel " s characters of low voltage power line, and formed an abstract carrier channel model. using this as its basis, a new kind of transmission technology is designed that adopted transmission technology combining the spread spectrum modulation with channel coding, which can solve the problems above mentioned to a certain degree, and need not pay for high cost

    文章不僅全面地介紹了電力線載波通訊技術的特點、應用及其發展狀況，還對目前的電力線載波通訊晶元進行了比較；並通過對低壓電網通道特性的分析和研究，抽象出其載波通道模型，在此基礎上，提出了將擴頻調制和通道編碼相結合的傳輸技術用於低壓電力線載波通信，這可以在很大程度上解決電力線的干擾問題，且不必付出高昂的代價。
  3. The design of direct sequence spread spectrum communication system for data transmission

    直接序列擴頻數據通信系統的設計
  4. Through some research in depth on soct, this thesis proposes a scheme of star - type vsat ( very small aperture terminal ) network based on overlap back transmission, and do some research on key techniques involved with the scheme and their partial realization with fpga ( field programmable gate array ), such as spread spectrum techniques, a non - coherent de - spreading spectrum and demodulation technique and adaptive interference cancel

    本文在深入研究衛星重疊通信技術的基礎上，提出了一種基於重疊回傳的星形vsat網方案。並在衛星重疊通信涉及的幾種關鍵技術及其部分核心器件的fpga實現等方面進行了一些研究，包括：擴頻技術、非相干解擴解調技術、自適應干擾抵消技術等，並將它們用於基於重疊回傳的星形vsat網方案。
  5. This paper presented a general systematic view of the power - line data transmission through ssc ( spread - spectrum communication ) technology. furthermore, it put forward two application schemes in the automatic reading ammeter system

    系統、全面地介紹了電力線載波通訊技術的特點、應用及發展狀況，並對目前的電力線載波通訊晶元進行了比較；同時，也提出了電力線載波通訊技術運用在遠程自動抄表系統中的應用方案。
  6. Based on the analysis of vhf - rc, the method of applying chaos direct sequence spread spectrum communication ( cds - ssc ) to ahts has been studied and discussed in this thesis. in this method, cds - ssc, which combines chaos sequences ( cs ) of high rand quality with ds - ss excelling in resisting interferences, is used to realize the transmission of hydrologic data

    文中所述方法利用混沌直接擴頻通信的通信方式來實現水文數據的傳輸，即將隨機性能較強的混沌序列作為擴頻碼與抗干擾性較強的直接擴頻通信相結合，應用於水文自動測報系統中去。
  7. The mobile multimedia communication system need to support the transmission of high - speed data and variable speed data compared with the ordinary spread spectrum communication. the data rate ranges from several kbps to hundred kbps for wide up to 2mbps. in order to assure different data rate to transmission in the same spread spectrum bandwidth, we need to use different lengths and orthogonal pn codes

    傳統移動通信系統所提供的數據速率一般只有幾kbps ，而移動多媒體通信所要求的數據速率范圍為幾mbps甚至幾十mbps ，在同一擴頻系統內傳輸多媒體的擴頻比也不一樣，就要採用不同長度的偽碼，而且偽碼之間必須保證正交性或準正交性。
  8. Traditional spread spectrum communication adopts pseudo - noise ( pn ) codes as spreading codes. however, pn sequence is fixed and periodic, which threatens the transmission security. self - encoded spread spectrum ( sess ) employs random spreading sequences that are extracted from the random information data, abandoning the fixed sequence

    傳統的擴頻通信廣泛採用偽噪聲（ pseudo - noise ， pn ）序列作為擴頻序列， pn序列具有類噪聲特性，但它實際上是確定的周期序列，容易被復制。
  9. System scheme of speech coding plus spread spectrum communication was presented based on a full analysis of noise characteristic, attenuation characteristic and impedance characteristic of low - voltage power line. spread spectrum carrier ( abbreviated as ssc ) technology is adopted to overcome problems existing in signal transmission over power line. high quality, low rate mbe compression algorithm was used to complete speech encoding and decoding

    在對低壓電力線路的噪聲特性、衰減特性和阻抗特性三個方面充分分析的基礎上，本文提出一種語音編碼+擴頻傳輸的系統總體方案，採用擴頻載波（ spreadspectrumcarrier ，縮寫為ssc ）技術克服電力線傳輸信號存在的問題，採用語音合成質量高並具有較低碼率的mbe壓縮演算法完成語音信號的編解碼。
  10. Every few milliseconds, a fhss signal bounces between different specific points in a designated " spread " of the electromagnetic spectrum, reducing interference from other signals and making it very difficult to eavesdrop on the transmission

    每隔幾毫秒， fhss信號在指定「擴展」的電磁頻譜的不同頻率點上跳動，減少其它信號的干擾，使它在傳輸中難以被竊聽到。
  11. This scientific research project bases on this starting point, develops the spread spectrum digital transmission system which can accomplish the digital transmission on power line

    本科研項目便是基於這一出發點，開發能實現在電力線上傳輸數據的擴頻數字傳輸系統。
  12. The lengths, numbers and orthogonality of the pn codes are important technologies. in the thesis we analyze the methods of spread spectrum transmission of wcdma

    偽碼的長度，數量和正交性都是很重要的關鍵技術，同時也必須考慮在通道等變化時保證通信質量。
  13. Spread spectrum communication is an excellent system, the transmission of multimedia will be necessary in the development of mobile communication. the multimedia spread spectrum transmission will be realized in the third generation mobile communication system

    擴頻通信技術是一種優良的體制，多媒體傳輸是信息發展的要求，在第三代移動通信系統中將實現多媒體擴頻通信。
  14. Then the present capacity of gsm and cdma system is analyzed and the cellular system total capacity adopting this co - frequency transmission scheme will be discussed in detail. it can be estimated that such an overlay has the potential of enhancing the overall spectrum efficiency and system capacity and it can provid e for the flexibility of spectrum utilization. finally this scheme will be simulated and then we analyze the relationship between spread spectrum processing gain, system capacity and mutual interference according to simulation results

    然後對現有的gsm系統和cdma系統的容量進行了分析，並對採用同頻傳輸方案的蜂窩系統容量進行了仔細的分析，通過計算得出用寬帶cdma系統與gsm系統進行頻帶共享，可以大大提高整個系統的容量，最後進一步對該方案進行了模擬，根據模擬得到的結果分析擴頻增益與系統容量和相互干擾之間的關系。
  15. In this paper, a complete scheme is proposed for el wireless spread spectrum modem in tdd mode. firstly, it discusses tdd protocols and base band module. secondly, with in - depth ananysis on hfa3860b and its high speed spread spectrum technology ( mbok ), we incorporates the chip for continuous and transparent transmission of el data successfully

    論文在對hfa3860b進行深入研究的基礎上，對晶元所採用的高速擴頻技術? mbok擴頻技術進行了理論探討，並成功地將其用於e1數據的無線擴頻透明傳輸，實現了系統要求，並且拓寬了晶元的應用范圍。
  16. In allusion to the problem mentioned above, a new scheme is brought forward in this paper. spread spectrum communication technology is applied in this scheme, which greatly improved the reliability of data transmission

    本方案採用擴展頻譜通信技術，利用擴頻通信抗干擾能力強的特點，大大提高了數據傳輸的可靠性，實現了在中、低壓電力線上的進行遠程抄表的功能。
  17. This article briefly presented the principle of lower voltage power line carrier technology and spread spectrum technology, and discussed the advantage, the mode, the current state of spread spectrum technology applied to lower voltage power line carrier communication, and analyzed the channel transmission characters of lower voltage power line with mechanical contact

    在本文中，簡要闡述了低壓電力線載波技術和擴頻技術的原理，討論了擴頻技術在低壓電力線載波通信中應用的優點、方式和現狀，並通過大量實驗，分析了帶機械接觸的低壓電力線路的傳輸特性。
  18. Based on the communication engineering applications, this thesis study the intelligent transmission technology and the performance of the spread spectrum modulated sequence. in this thesis, some own conclusions have been concluded and testified using communication simulink under the possibility of the applied environment

    本文在面向通信工程應用的基礎上，對智能傳輸技術和擴頻調制碼的性能進行了一定的研究，提出了自己的結論並使用通信模擬技術對這些結論在可能的應用環境下進行了證明。
  19. We use the spread spectrum carrier method to improve the ability of anti - disturbing and reliability of the transmission of the data, the theory of the spread spectrum communication and its realization in the power line carrier is discussed in detail

    提出一種使用擴頻載波的方法，以求達到較高的抗干擾能力和數據傳輸可靠性，文中詳細論述了擴頻通信的原理及其在電力線載波中的實現。
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