base modulation 中文意思是什麼

base modulation 解釋
基極調幅
  • base : n 1 基底，基，根基，底座；底層，底子；（紀念碑等的）基址；（山）麓。2 【軍事】基地，根據地。3 根...
  • modulation : n 調整，調節；（聲調的）抑揚，變化；【音樂】轉調，變調；【無線電】調制。 amplitude modulation 振...
  1. The research of base band ijf coding and modulation technologies

    編碼調制技術的研究
  2. On the base of researching the theory of the scheme and analyzing the signal feature, it is obtained that the existence manners and character of distance information in the differential frequency signal. at the same time, a new conclusion is gained that the technology of frequency agility can decrease the constant error of system. it is also to say that frequency agility and frequency modulation fixed - distance fuze has the similar feature to random period frequency modulation fixed - distance fuze. according to the theory of address coding in the hopping - frequency communication, the paper presents the principle of selecting the frequency agility sequence which fit to the radio fuze and constructs the frequency agility sequence family based on the rs codes

    在深入研究方案原理和分析信號特徵的基礎上，獲得了該體制引信差頻信號中，距離信息的存在形式和特點，得出了頻率捷變技術的引入降低了系統定距固定誤差這一新的結論，即頻率捷變調頻定距引信在定距性能上具有類似隨機周期調頻定距的特徵。本文引入跳頻通信地址編碼理論，結合無線電引信的具體特徵，提出了適用於無線電引信的頻率捷變序列的選擇原則，並構造了基於rs碼的寬間隔頻率捷變序列族。
  3. This thesis introduces the base theory and correlative information of variable frequency speed variation, and expatiates sinusoidal pulse width modulation ( spwm ). the principle of svpwm is in - depth discussed, and a simple algorithm for svpwm is ratiocinated

    本文介紹了交流變頻調速的發展概況，分析了其基本原理，闡述了正弦脈寬調制（ spwm ）原理，對svpwm理論進行了研究，給出了svpwm的簡單實現演算法。
  4. In this field, swing modulation by the polarize device were designed, this method was the base of our spatial light modulator

    在這一方面的探索中，人們創立了通過偏振器件完成振幅調制的方法，這種方法是本空間光調制器的基礎。
  5. On the one hand, according the design principle of torque sensor, this paper researched the non - contact torque sensor, which base on the theory of electric resistance strain and the rotation transformer and could satisfied the request of our project as well as the condition of the producing process. on the other hand, the modulation method of torque signal has been solved before the signal was input to the industry computer, therefore, solved the problem of signal transfers

    其次，研究和研製了扭矩在線測試工作所需要的儀器硬體。一方面，根據扭矩傳感器的設計原理，研製了滿足課題要求和生產現場條件的，基於電阻應變理論和電感集流環的非接觸型扭矩傳感器；另一方面，制訂了扭矩信號在輸入工業計算機之前的調理方法，解決了信號傳輸問題。
  6. Firstly, on the base of analyzing psk ' s theory and audio - card ' s constitute and data transfers, bdpsk and qdpsk soft - modulation and soft - demodulation systems based on audio - card are studied and implemented, including generating digital carrier sequence, synchronizing carrier, designing filter, sampling and judging, etc. the system adopts coherent demodulation method, synchronizing carrier adopts costas loop

    本文首先分析了調相信號調制解調的基本理論和多媒體計算機（ mpc ）聲卡組成原理及數據傳輸等方面的內容，然後研究並實現了基於計算機聲卡的bdpsk和qdpsk信號軟體調制解調系統，內容包括數字載波序列的產生、載波同步、濾波器設計，信號的抽樣判決等。
  7. Digital tv qpsk modulation in the treatment of the data flow of energy to deal with the proliferation of randomization, rs codeconvolution interleave contraction coding, modulation before forming the base - band processing to ensure that the data transmission performance

    Qpsk數字電視調制器在對數據流的處理上採用能量擴散的隨機化處理rs編碼卷積交織收縮卷積編碼調制前的基帶成形處理等，保證了數據的傳輸性能。
  8. One way to construct this system base on single - carrier modulation technique

    建立該系統的一種方式是基於單載波調制技術。
  9. For implement of wide band modulation, multi - carries and elimination of adjacent channel interference to satisfy ber requirement in wcdma system, which is most popular in 3g technology, the linearity requirement of the base station power amplifier becomes tighter

    以wcdma為代表的第三代移動通信技術，為實現寬帶調制、多載波應用，同時減小鄰通道干擾以滿足通信系統的誤碼率要求，對基站發射機功放的線性指標要求苛刻。
  10. An optically addressed spatial light modulator ( oa - slm ) made of brd96n and based on its good nonlinear optical characteristics is presented. an experiment study on the mutual conversion of coherent - to - incoherent image is carried out, and the mutual modulation of two spatial light beams can be realized base on the gene - variant br films

    基於br膜良好的非線性光學特性，開展了br膜作為一種光尋址的空間光調制器（ br - oa - slm ）的研究，進行了相干光圖像信息與非相干光圖像信息的相互轉換實驗，實現了空間兩束光的相互調制。
  11. Based on the existent theory and the engineering application, the thesis study the good performance by combined the adaptive modulation technology and the multilevel modulation technology on the simulink model. experiment results show that this combination bring on the high data transmittable efficiency and the well transmission quality. this chapter is a base of next chapter

    根據已提出的基本理論，論文基於工程應用，在模擬模型上對自適應調制和多元調制方式的結合所產生的優良的性能進行了探討，模擬顯示出這種結合帶來的高數據傳輸效率和大的傳輸質量改善，本章是第三章的基礎。
  12. Second, based on the theory of synthetic discriminant function, several sub - reference images were synthesized to form the reference image base to realize rotation distortion - invariant recognition, which also solved the ill - problem of synthesizing a single reference image with the whole training distorted images and made the pose estimation easier. third, the phase - encoding and amplitude modulation distortion - invariant jtc for multi - target recognition were described

    其次，論文採用綜合識別函數方法構成子參考圖像，建立參考圖像庫的方法解決了目標旋轉畸變不變的識別問題，克服了由大量訓練圖像合成單幅參考圖像時，高頻信息損失嚴重的病態問題，並可實現對真實目標旋轉姿態的估計。
  13. Then, the definition of high order cumulants and the value of digital modulation signals ’ high order cumulants are presented. according to calculate the value of base band signals ’ high order cumulants, 4ask, 2fsk, 4fsk, bpsk, qpsk, 16qam can be distinguished. this method is demonstrated by simulation data and sampled data

    接著，本文介紹了高階累積量的定義和多種數字調制信號高階累積量的值，通過計算基帶信號的高階累積量，可以對4ask 、 2fsk 、 4fsk 、 bpsk 、 qpsk 、 16qam六種信號進行分類，利用模擬信號和實際采樣信號對該方法進行了論證，該方法可以在低信噪比條件下實施。
  14. Base - width modulation

    基區寬度調制
  15. ( 2 ) a new digital frequency - hopping communication system based on cipher - quasi - chaotic sequence is proposed, which combines the cryptography and frequency - hopping technology. the system ' s protocol, base - band signal processing and modulation / demodulation algorithms of the radio - frequency part are designed, and the hardware experiment conducted on a prototype of the system show that the system functions well. the finite precision problem arising while taking use of chaotic signal to generate pseudo - random sequence is studied and the anti - tracking capability of the cipher - quasi - chaotic sequence is studied with the volterra - tls method proposed in this dissertation

    （ 2提出一種新的基於密碼準混飩序列的密碼與跳頻技術相結合的跳頻通信系統，並且進行了協議部分、拂信號處聊分、射頻調制解調演算法部分的模擬研究和系統的硬體實驗研究；研究了利用混飩信號產生偽隨機序列的有限精度實現問題，利用本文提出的m業肚m 113方法對密碼準混飩序列產生的跳頻碼的抗鵬干擾能力進行了模擬實驗研究。
  16. In chapter 4, the spread spectrum modulation sequence performance is discussed on the base of the multiple address selected ability and secret communication

    在第四章中，在基於多址選擇能力和保密通信的基礎上對擴頻調制序列性能進行了討論。
  17. The frequency difference sensitivity of the modulation mode and the ability to overcome distortion by limiting amplitude of the signal and to overcome interference also affect the performance, too. in this paper, the relationship between the ability to overcome interference and the modulation mode is discussed at first. then the characters in some aspects specif ' ed above of some common modulation mode such as mfsk mpsk ofdm are studied. on this base, some according solutions to the problem of the different frequency - hopping system are put forward. in the past half of this paper, the realization scheme, pcrforemance and improving measures of ofdm are studied

    本文首先較詳細地討論了跳頻抗干擾的能力與調制制度的關系，接著分別研究了幾種常用調制方式（ mfsk ， mpsk ， ofdm ）上述幾方面的性質，針對各跳頻系統存在的問題提出了相應解決方案，在本論文後半部分重點討論了ofdm跳頻系統的實現方案、性能及改進措施。
  18. Based on these advantages we analyze the performance of constant - power variable - rate m - qam schemes for spectrally efficient data transmission over nmf channels. by introducing the adaptive modulation approach, we gain two things : 1 ) the error rate is kept at a constant level. 2 ) the achievable spectral efficiency comes within 5 db of the shannon capacity limit. at the last chapter, the presentation of a single base station and a single mobile scenario proved the feasibility of adaptive schemes

    然後作者的精力轉入通道的自適應方案的研究中，首先通過研究發現nakagami衰落因子的適當調整可以近似於常見的瑞利衰落和萊斯衰落，接著研究在無線通道中採用三種不同自適應方案時的通道容量，研究表明速率的調整是增加通道容量的關鍵，在此基礎上，著重研究了離散變速率qam的情況，表明這種調制方案無論在頻帶利用率還是在系統平均誤碼率比其它情況提高很多。
  19. The charictrization, construction and searching algorithm of m - ldpc codes were studied and analsised. base on m - ldpc codes, a new joint coded modulation scheme is proposed ( bp - mlc - id ), which differ form conventional mlc schems in that only one channel coder was used

    在上述基礎上，把多級ldpc碼進一步應用於mimo空間，並與空時分組碼有機結合，提出一種新的基於迭代譯碼的時空并行獨立通道聯合編碼調制（ bp - stbc - id ） 。
  20. The relative motion between the base station and the mobile results in random frequency modulation due to different doppler shifts on each of the multi - path components, also called time selective fading

    由於基站與移動臺之間的相對運動，每條路徑都會有一個明顯的多普勒頻移，導致通道的隨機頻率調制，也稱時間選擇性衰落。
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