band scheme 中文意思是什麼

band scheme 解釋
能帶圖式
  • band : n 1 帶，繩；帶形物；箍；箍條；嵌條；鑲邊；鋸條； 〈pl 〉 （法官等的）寬領帶。2 束縛，羈絆；義務；...
  • scheme : n 1 計劃；方案；路線；設計。2 系統；配合；組織。3 綱目；表；清單；分類表；大綱。4 謀劃，策劃；詭...
  1. After elaborating the principle of an 802. lib key modulation scheme - complementary code keying ( cck ), this paper proposes and realizes a hardware circuit solution of 802. 11b pcmcia wlan interface card, which can reliably offer a maximal 11mbps data rate and freely switch within 14 working channels in 2. 4ghz frequency band

    接著在詳細闡述了802 . 11b協議核心調制技術?互補碼鍵控（ cck ）的原理的基礎上，本文提出並實現了一種峰值傳輸速率為11mbps的802 . 11bpcmcia高速無線網卡的硬體電路設計方案，在2 . 4ghz頻段該網卡可在14個工作通道上自動切換，實現高速突發數據的可靠傳輸。
  2. In communicaton the bandwidth is an important problem that we should consider, specially in wireless communication. in fact the fiber is mainly used in backbone networks, so it is essential to develop the low rating coding technology of voice. the arithmetic of melp is based on the model of lpc and use the form of mixed excitation. because it integrates the idea of multi - band, so it has the merit of lpc and mbe. it is a perfect coding scheme in low rating voice coding relatively

    而melp語音壓縮編碼演算法是在線性預測編碼參數模型的基礎上，採用混合激勵的形式，並且結合了多帶的思想，因此它擁有線性預測編碼和多帶激勵的優點，是目前低速率語音編碼中一種比較理想的編碼方案，也是本文研究的重點。本論文通過研究melp的語音編解碼演算法的原理，對它的編解碼過程作了比較深入的研究，對其中的一些公式進行了理論推導，並作了模擬分析，最後研究了該演算法的c語言實現。
  3. Pll has the excellent narrow - band - tracking - filtering characteristic. in this scheme, we combine the merits of dds and pll

    該方案是將dds的高解析度、高精確度、頻率變化易於控制的優點與pll良好的窄帶跟蹤性能相結合。
  4. Chapter 3 treats the algorithm implementation of demodulator in the receiving asic of dvb - s. in detail, demodulation includes carrier recovery and symbol synchronization. together with the transmission characterization of band - limited input signals the chapter proposes a scheme for implementing carrier recovery loop

    解調具體分為載波恢復、時鐘同步兩大部分，本章著重論述了載波恢復的原理並結合dvb - s輸入信號傳輸特性，提出了相應的實現方案，對部分電路進行了性能分析。
  5. This subject comes from the project : c band low phase noise tunnable jumping frequency source in chengdu saiying science and technology co, . ltd. the frequency synthesis technology of pll + mixer is adopted in the final scheme. at first, the developing history of the frequency synthesis technology is reviewed. then direct frequency synthesis technology 、 pll frequency synthesis technology are introduced

    本文首先首先簡述了頻率合成技術的發展歷史，介紹了直接頻率合成技術、鎖相環頻率合成技術、 pll +混頻的頻率合成技術的基本理論以及具體的系統設計中應該考慮的方面。
  6. The digital base - band cdma transmitting and receiving scheme is put forward. the scheme uses a technique called as zero medium frequency without the need of pn codes synchronously are resumed

    提出了具有免偽碼同步恢復、免載波同步提取、免位同步的零中頻cdma數字基帶發送、接收方案。
  7. By means of using the electronically tuned preselector and multiple conversion technology, a wide band receiver with wide dynamic range is basically achieved. the scheme is innovative and original not only in the scheme itself but also in the technology of some sub - circuits

    課題採用電調選頻和多次混頻的方案基本實現了大動態寬頻帶接收，該方案無論是方案本身還是方案中所涉及到的技術都具有一定的創新與獨到之處。
  8. Aiming at the scheme of the signal electromagnetic environment simulator of the wireless communication system, the mission of this project is to design and realize the conversion of high speed parallel signal to serial signal and conversion of high speed digital signal to analog signal. the signal comes from the v / uhf wave band of the background simulator

    本課題的任務是針對通信信號電磁環境模擬器系統的方案要求，設計實現背景信號模擬器v uhf波段後端高速信號的復接與d a轉換，為后級的頻率綜合器的信號頻譜搬移提供了基本信號。
  9. Five cell circuits are designed, fabricated and tested, including 5. 625 degree and 45 degree using loaded - line phase shifter, 90 degree using 3db branch - line coupler phase shifter, 90 degree and 180 degree using switched - line with loaded - line phase shifter. according to the testing result of cell circuits, and requirement of ku - band six - bit digital phase shifter, the scheme for ku - band six - bit digital phase shifter is chosen

    本文對5 . 625度和45度相移位採用主線加載的加載線形式，對90度相移位採用3db支線耦合器形式和加載式的開關線形式，對180度相移位採用加載式的開關線形式，分別進行了五個單元電路的設計、製作與測試。
  10. As a high band - efficiency digital modulation scheme, dvbc ( digital video broadcasting of cable ) qam ( quadrature amplitude modulation ) modulator is widely adopted in the wide - band communication area, such as hdtv broadcasting, cable modem, microwave communication, satellite communication and so on

    正交幅度調制器（ qammodulator ）作為一種高頻譜利用率的數字調制方式，在高清晰度電視（ hdtv ）廣播、 cablemodem 、固定寬帶無線接入、衛星通信、數字微波傳輸等寬帶通信領域得到了廣泛應用。
  11. In section three, a complementary scheme of spectral coding and decoding is proposed. it makes full use of the broad band incoherent gauss optical source and compensates the unflatness of sectrum of the source. combining with the method of banlanced detecting, the multiple accsss interference of the multiple users is rejected in the decoding port

    不同於ocdma系統中每個用戶擁有一對編解碼器，該方案通過利用二維rs碼字的周期性和awg路由器的循環性，系統所用的編解碼器能夠同時對不同用戶的地址碼進行編解碼，使得系統中的用戶共享編解碼資源，減少了系統的復雜性。
  12. This subject aim at designing a linear power amplifer whose output power is 40w for 225 - 450mhz band. but it seems not easy to finish the task because of this power amplifier own unique requirements including high output power, broad working frequency band, high linearity, and flat gain. due to the complexity involved, theoretically several soltuions are derived in the final scheme such as broadband matching technology, power - retreat, power synthesize, automatic power control and negative feedback. in addition, the design will be optimized by eda software and the final test result indicates that our design is successful

    本課題的目標是研製一個輸出功率為40w的225 450mhz的線性功率放大器。由於該功放要求輸出功率大，工作頻帶寬，帶內增益波動小，線性度高，所以其終合設計難度大。鑒于這個原因，在理論設計上筆者採用了寬帶匹配、功率合成、功率回退、負反饋、自動功率控制等技術；在實踐中精心設計電路，並且配合eda軟體模擬，最終達到所要求的指標。
  13. Here a scheme to implement broad - band constant beamwidth digital beam - former has been presented. the results of computer simulation show the scheme is effective

    本文給出了一種寬帶恆定束寬數字波束形成器的實現方案，計算機模擬結果表明了該方案的有效性。
  14. The work presented in this paper is carrying out to the theory research of dbf. the work includes : research of dbf algorithms, dbf antenna system composition and realization. the application of dbf algorithms used in high frequency ground wave radar for near ocean inspection and ocean situation remote sensor is also presented. at last, we give a effective scheme to implement broad - band constant beamwidth digital beam - former

    本文的主要工作是圍繞數字波束形成技術的理論研究，內容包括：數字波束形成演算法的研究，數字波束形成天線的系統構成和實現，以及將數字波束形成演算法應用於高頻地波雷達近海監測和海態遙感，最後給出了一種寬帶恆定束寬數字波束形成器的設計方案。
  15. In chapter 2, first give the theory of phased array radar. second introduce the analog t / r module and digital t / r module. third discusses some key technology of wide band digital t / r module, including ddws technology and quadrature modulate technology. at last present a scheme of l bandwide banddigital t / r module

    第二章首先介紹了相控陣雷達系統的組成和工作過程，其次介紹了模擬t / r組件和數字t / r組件的組成，然後介紹了寬帶數字t / r組件的關鍵技術，包括:直接數字波形產生技術和正交調制技術，最後提出了一種l波段寬帶數字t / r組件的框圖。
  16. Chapter 3 treats the principle of the best tuning synchronization loop, and the realization of the data - aided timing synchronization loop. together with the characterization of band - limited signals without biter symbol interference and the one of atsc - vsb signals, the chapter proposes a scheme for implementing timing synchronization loop used in hdtv

    第三章首先論述了最佳位同步環的原理，以及數據輔助位同步環的實現，並結合無碼間干擾的基帶傳輸特性及atsc - vsb的特點，提出了hdtv中位同步的實現方案。
  17. In the first chapter, the class of modern frequency composing techniques and the recent development situations have been introduced. then the advantages and disadvantages of the techniques have been described. at last, based on the techniques mentioned above, a scheme to realize the x - band low phase noise frequency source has been proposed

    在第一章引言部分，主要介紹了現代頻率合成技術的分類及技術發展近況，並就每一種合成技術的優缺點做了簡要的陳述，最後以上述不同合成技術的優缺點為基本指導思想，提出了一種實現x波段低相噪頻率源的方案。
  18. Moreover, in this dissertation, the scheme of the optical link of x - band ocpar is discussed

    X波段光控相控陣雷達光鏈路的實現方案也是本文的論述對象。
  19. This paper divides into six chapters : the first chapter - base on the analyses of the origin, conception and development status of sr, this chapter discusses the key technology and realize difficulties of sr and advances the intention and meaning of the paper. the second chaptei - the sr system with radio frequency band - pass sampling architecture is a design scheme close to software wireless radio ( swr ), this chapter introduces three system architecture of sr system and analyses the theory of radio frequency band - pass sampling. the third chapter - this chapter analyses and designs the dsp hardware platform with radio frequency band - pass sampling architecture

    本論文分為六章：第一章在分析軟體無線電的起源、概念、發展概況的基礎上，闡述了軟體無線電的關鍵技術及實現難點，提出了本論文研究的目的與意義；第二章射頻直接帶通采樣軟體無線電結構是接近理想化的軟體無線電設計方案，本章對軟體無線電系統的體系結構及射頻直接帶通采樣原理進行了分析；第三章分析並設計了射頻直接帶通采樣結構軟體軟體無線電系統的dsp硬體平臺；第四章研究了調制解調及信號調制樣式的識別演算法並給出了dsp實現，這是在dsp平臺上實現軟體無線電功能的一種常規方法；第五章分析了應用快速原型技術開發軟體無線電系統的必要性及可行性，完成了軟體無線電系統的matlab模擬及結合ti公司的tms320c6711dsk板的快速原型實現，這也是本論文提出的軟體無線電的一種新的研究方法。
  20. In this thesis, research on the basic scheme of the miniature low phase - noise mm - wave phase - locked frequency synthesizer is presented, and the circuit design and testing of the function component the x - band low phase - noise single output frequency synthesizer are also given

    本文主要是對毫米波頻段的小型化、低相位噪聲鎖相頻率合成源的基本方案進行了研究，並研製了其功能組件? ? x波段低相位噪聲點頻源。
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