相對頻移鍵控 的英文怎麼說

中文拼音 [xiāngduìbīnyíjiànkòng]
相對頻移鍵控 英文
rfsk relative frequency shift keying
  • 相 : 相Ⅰ名詞1 （相貌; 外貌） looks; appearance 2 （坐、立等的姿態） bearing; posture 3 [物理學] （相位...
  • 對 : Ⅰ動詞1 （回答） answer; reply 2 （對待; 對付） treat; cope with; counter 3 （朝; 向; 面對） be tr...
  • 頻 : Ⅰ形容詞（次數多） frequent Ⅱ副詞（屢次） frequently; repeatedly Ⅲ名詞1 [物理學] （物體每秒鐘振動...
  • 移 : Ⅰ動詞1. （移動） move; remove; shift 2. （改變; 變動） change; alter Ⅱ名詞（姓氏） a surname
  • 鍵 : 名詞1 [機械工程] （使軸與齒輪、皮帶輪等連接並固定在一起的零件） key 2 [書面語] （插門的金屬棍子）...
  • 控 : 動詞1 （告發;控告） accuse; charge 2 （控制） control; dominate 3 （使容器口兒朝下 讓裏面的液體慢...
  • 相對 : 1. （面對面） opposite; face to face 2. （非絕對的） relative 3. （比較的） relatively; comparatively
  1. This thesis analyzed the error performance of mfsk and mpsk modulator in hf with optimal receiver, studied the shortcoming and strongpoint of several typical short - wave data transmission systems and their performance over fading and intersymbol interference channels. the theory and key technical of adaptive modem is discussed. in the last, an efficient modulation scheme - block coded modulation is introduced into hf radio systems to improve the efficiency of hf data transmission, this paper also proposes a hf data transmission system scheme composed of a block coded modulator and a decision feedback type adaptive equalizer

    本文在對短波數傳兩種常見調制方式fsk及psk最佳解調性能分析的基礎上，討論了幾種採用典型調制技術的短波數傳系統（如時頻調制、多進制頻移鍵控慢跳頻、 chess系統）原理、優缺點以及抗衰落和抗符號間干擾的性能；分析了自適應串列數傳系統抗短波通道衰落和多徑干擾的原理、關鍵技術；在本文的最後引入一種有望解決短波數傳系統低效率狀況的調制方式bcm -分組編碼調制，給出了一個採用bcm技術與自適應均衡技術相結合的短波數傳系統方案，並通過計算機模擬進行了初部驗證。
  2. The twelve kinds of modes and equivalent circuits of this inverter with high frequency link within one high frequency switching period are carefully analyzed ; by using the state - space averaging approach, the inverter ’ s averaging model is presented, and the design criterion of key circuit parameters and the output characteristic curve are given ; the analyses of the system stabilization and the mathematic analyzes of the principle of high - frequency - link of this inverter have also be done. prototypes for 1kva 270v 10 % dc / 115v400hzac uni - polarity phase shifting controlled bi - directional voltage mode inverter with high frequency link is designed

    以全橋橋式拓撲為例，論述了雙向電壓源型高頻環節逆變器單極性移相控制的原理、逆變器在一個高頻開關周期內的十二個工作模式及其等效電路;採用狀態空間平均法建立了逆變器平均模型，獲得了這類逆變器的關鍵電路參數的設計準則和外特性曲線;分析了系統穩定性，並對逆變器高頻環節原理進行了數學分析。
  3. Take european dvb - s standard applied to various satellite broadcast for example, the channel coding structure charts is established. the theory of modulation mode of qpsk and forward error correct including rs coding, convolutional coding, energy dispersal and interleaving are reseached. 4

    以歐洲的dvb - s適用於多種衛星廣播系統的標準為例，建立了通道編碼的結構圖，對數字視頻廣播中的前向糾錯（包括了rs碼，卷積碼、能量擴散和交織技術）和調制方式四相相移鍵控調制進行了研究。
  4. To solve this problem, this thesis will focus on investigation of the following detection methods based on the features of the dsss signal and with the binary - phase - shift - keying dsss ( dsss / bpsk ) signal as an example. 1. the power spectrum of the dsss / bpsk signal is discussed and the detection performance in each power spectrum estimation method is compared in terms of nonparametric methods, parametric methods and subspace methods in power spectrum estimation

    本文針對這一問題，從dsss信號特徵出發，以二進制相移鍵控的直接序列擴頻（ dsss / bpsk ）信號為例，研究了以下檢測方法: 1 .從功率譜估計的非參數方法、參數方法和子空間方法入手，討論了通過不同類型方法估計的dsss / bpsk信號功率譜，並比較了各功率譜估計方法應用於dsss / bpsk信號檢測的性能。
  5. Multi - uesr detection ( mud ) refers to signal detection in multiple access communications. this detection has many good properties, such as decreasing multiple access interference, canceling out or moderating near - far resistance, able to decrease the requirement for output control, compensating the effects due to inoptimal orthogonality, improving system performance and increasing system capacity. mud is one of the methods that can overcome the mai in cdma with most potential and complete and becomes one of the critical techniques in the third generation mobile communication

    多用戶檢測是指多址通信中的信號檢測，具有抑止多址干擾;消除或減輕遠近效應;可適當降低對功率控制的要求;彌補擴頻碼互相關性不理想造成的影響;改善系統性能，提高系統容量等眾多優點，是克服cdma多址干擾最有潛力、最徹底的一種方法，並已成為第三代移動通信標準中倡導的關鍵技術之一。
  6. A full - digital demodulation technique is introduced in this paper, which can make it easy and quick to design and achieve binary phase shift keying ( bpsk ) demodulator, and also can reduce the requirement of the oscillator frequency precision and the degree of stability of the receiver

    本文介紹了一種適合於用數字信號處理器（ dsp ）實現的全數字解調技術。該技術能方便、靈活地設計實現二進制相移鍵控（ bpsk ）解調器，而且使用該技術可以大大降低對接收機本身的振蕩頻率精度和穩定度的要求。
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