dsss direct sequence spread spectrum 中文意思是什麼

dsss direct sequence spread spectrum 解釋
直接序列擴頻
  • dsss : 直接序列擴頻
  • direct : adj 1 筆直的，一直線的；正面的。2 直接的。3 直截了當的，直率的，明白的。4 直系的，正統的。5 【語...
  • sequence : n 1 繼續；接續；連續。2 順序；程序；次第；關系；關聯。3 後果；結果；接著發生的事；後事；後文。4 ...
  • 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。
  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. We analyzed the anti - jam and band inside anti - interfere performance of the system, and the low probability intercept ( lpi ) of the traditional direct sequence spread spectrum ( dsss ) modulations in the uav platform ' s applications. so a new modulation technique using a multi - level pseudo noise ( pn ) code has been presented. the new multi - level pn code is built from a high speed pn code through a low passed filter ( lpf )

    分析了系統抗阻塞式干擾和抗帶內頻帶干擾的性能，以及常規bpsk qpsk - dsss調制在無人機通信中存在的安全隱患，提出了一種用多電平pn碼進行擴頻調制的方法：採用高速pn碼，經過低通濾波器，產生多電平pn碼進行直序擴頻調制，能在低信噪比情況下有效抵抗平方率檢測器對系統載波的檢測。
  3. But modern electronic counterwork technic could exactly estimate the carrier frequency, signal period, even the pseudo - random ( pn ) sequence itself of direct sequence spread spectrum ( dsss ). it is urgency to investigate a new dsss to achieve lower probability of detection ( lpd ) and higher anti - jamming

    然而現代電子對抗技術可以準確估計直接序列擴頻通信的載波頻率、符號周期甚至擴頻碼本身，為達到更低截獲率和更高抗干擾的通信目的，必須研究新的直擴通信技術。
  4. In the text, direct sequence spread spectrum signal ( dsss signal ) is the main object, and some nonlinear methods based on chaotic theory, used in the prediction of signal and detection of signal is studied

    本文以保密通信中廣泛使用的直接序列擴展頻譜信號（ dsss信號）為主要對象，研究了一些基於混沌理論的非線性的方法在信號預測和信號檢測中的應用。
  5. The technology of direct sequence spread spectrum / code division multipul access ( dsss / cdma ) are applied in the broadband code division multiplex wireless communication systems, which means transmitting data at the rate of 2. 048mbps using four e1 lines within the band of 20mhz. in this paper, the theory of the whole debice is first analysized specified for the system asic design and optimizing its performance

    寬帶碼分復用無線傳輸系統是採用直接序列擴頻/碼分多址（ dsss / cdma ）技術，在20mhz頻帶內實現四路2 . 048mbps的e1鏈路數據速率的無線傳輸。本文首先分析了整個數傳設備實現原理，針對系統asic設計和優化整機集成性能出發，提出並實現了基於fpga控制pm4314e1晶元的介面模塊完成對e1鏈路信號的監控和告警功能的改進方案。
  6. An algorithm for the suppression of narrowband interference in the direct sequence spread - spectrum ( dsss ) systems is presented

    摘要提出了直接序列擴頻通信系統中抑制窄帶干擾的一種演算法。
  7. According to the ideology of software radio theory, the realization of intermediate frequency ( if ) digitalized direct sequence spread spectrum ( dsss ) receiver is one of the focuses in dsss communications study. it is of great value to deploy narrowband interference ( nbi ) suppression techniques in if digitalized dsss receiver for commercial and military applications

    根據中頻數字化這一軟體無線電思想實現擴頻接收機是目前擴頻通信研究的熱點，在中頻數字化擴頻接收機體系結構內研究窄帶干擾抑制技術具有重要的商業和軍事應用價值。
  8. In this chapter, we began with the mac - layer and then briefly explained the three types of ieee 802. 11 physical ( phy ) layers ( frequency hopping spread spectrum ( fhss ) physical layer, direct sequence spread spectrum ( dsss ) physical layer and infrared ( or photonic ) physical layer )

    本章從mac層開始，簡要解釋了三種類型的ieee802 11物理層：跳頻擴譜（ fhss ）物理層、直接序列擴譜（ dsss ）物理層、紅外（或光子）物理層。
  9. In chapter three, the theory of particular anti - jamming technologies are analyzed, especially the spread spectrum ( ss ) is one of the most important anti - jamming technologies, including direct sequence spread spectrum ( dsss ), frequency hopping spread spectrum ( fhss ) and other improved technologies

    第三章研究了時域、頻域、功率域多種抗干擾技術的抗干擾機理和定量描述抗干擾能力的方法，其中擴展頻譜技術是主流的抗干擾技術，包括直接序列擴頻和跳頻技術以及它們的改進方案。
  10. With the development of the modern electronic counterwork techniques, the estimate of the carrier frequency, signal period, and even the pseudo - random ( pn ) sequence itself of direct sequence spread spectrum ( dsss ) is possible

    隨著現代電子對抗技術的發展使得估計直接序列擴頻通信的載波頻率、符號周期甚至擴頻碼本身變為可能。
  11. Direct sequence spread spectrum ( dsss ) system usually operates in the condition of low signal - to - noise ratio ( snr ). the receiver extracts information from the signal through correlation operation by the spread code

    直接序列擴頻通信系統通常工作于低信噪環境中，接收機以擴頻碼對信號相關解擴提取信息。
  12. Additionally, since direct spread spectrum sequence ( dsss ) signal has an ultra - low power spectrum density, finding approaches to detect it and estimate its parameters in the non - cooperative communication system is a great challenge for applications

    另外， dsss信號由於具有極低的功率譜密度，如何在非協作通信中不知道擴頻序列的前提下對其進行檢測和估計，是一個具有很強應用背景的課題。
  13. Direct sequence spread spectrum ( dsss ) communication systems have the characteristics of wide spectrum, low working signal - to - noise ratio ( snr ), anti - interference, anti - multipath effect, capability of cdma, lpi and lpd

    直接序列擴頻（英文簡稱dsss ）通信具有頻譜寬、工作信噪比低、抗干擾和抗多徑效應能力強、可實現碼分多址、低截獲和低檢測概率等特點。
  14. For communication signals, we detect if there exist spread spectrum signals such as direct sequence spread spectrum ( dsss ) or frequency - hopped ( fh ) signals and estimate their parameters if the dsss or fh signals exist

    其次，對通信信號，檢測是否有擴頻信號存在並估計擴頻參數；如果是非擴頻的一般調制信號，則識別其調制模式。
  15. Chapter two demonstrates the performances of spread spectrum technique systematically. then the working principle of direct sequence spread spectrum ( dsss ) model is introduced, and the interference immunity properties are particularly discussed

    第二章對擴頻通信技術的性能進行了系統分析，介紹了直接序列擴頻方式通信系統模型的工作原理，詳細論述了該系統的抗干擾性能。
  16. Direct - sequence spread spectrum ( dsss ) takes a signal and " spreads " it over several frequencies, essentially creating redundant signals

    直接順序擴頻（ dsss ）取出信號，把它「散布」到幾個頻率上，實質上形成了冗餘的信號。
  17. Recently spread spectrum technique has been used widely in wireless data communication, cellular mobile communication, military communication and telemetry monitor system with resistance to interference, high usage of spectrum, resistance to multi - path fading, so investigators in communications field pay more attention to the technique, especially direct sequence spread spectrum ( dsss ) technique

    近年來，擴頻技術以其抗干擾能力強、頻譜利用率高、抗多徑等優越性能在無線數據通信、蜂窩移動通信、軍事通信以及遙測監控系統中獲得了廣泛的應用，並日益受到通信領域研究人員的重視，特別是直接序列擴頻技術（ dsss ） 。
  18. The direct sequence spread spectrum ( dsss ) signal has been widely used, owing to the ability of lower working signal - to - noise ratio ( snr ), strong anti - jamming, lower probability interception and mitigating the effects of multi - path fading

    直接序列擴頻（ dsss ）信號由於具有工作信噪比低、強抗干擾性、低截獲率、能夠抑制多徑效應等優點，已經得到廣泛應用。
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