ifft 中文意思是什麼

ifft 解釋
東京國際傢具見本市
  1. Ifft 2006international furniture fair tokyo

    日本國際傢具展
  2. In the first part, researches the theory of ofdm, and how to realize ofdm system by fft / ifft

    第一部分首先研究ofdm理論，以及如何用基於fft和ifft的技術實現ofdm系統。
  3. The design and implementation of transform - domain filter algorithm based on fft / ifft transform is discussed

    闡述了基於fft / ifft變換的變換域濾波技術在fpga上的設計與實現。
  4. To solve the problem of higher range sidelobe of phase - coded radar, the method of removing big power signals with fft _ ifft is presented in this paper

    針對相位編碼雷達距離旁瓣較高的問題，本文提出了fft _ ifft法去除大功率信號來抑制距離旁瓣。
  5. The research results show that the influence of sampling frequency, sampling error of peak value, strobe - position and strobe - width on fft and ifft is obvious

    研究發現，超聲信號的采樣頻率、采樣特徵點、閘門位置及閘門寬度對超聲信號的fft及ifft結果有明顯的影響。
  6. The filter can satisfied different characteristics requirements by transferring four window functions, intercepting different filter archetypes. 2 realizing fft / ifft with time - drawing

    此設計法實現的濾波器，可通過調用四種窗口函數，截取不同的濾波原型，以滿足不同的性能要求。
  7. Each order rainbow can be separated and reconstructed from the interference intensity distribution, using low or band pass filtering for the interference spectrum of the intensity and ifft

    提出了對干涉強度頻譜進行低通和帶通濾波、 ifft的方法，從干涉強度分佈中分離重建各階彩虹。
  8. Consequently, the author presents the basic principle of ofdm, and the process how to utilize the certain technology based on fft & ifft to realize the ofdm system

    描述了802 . 11協議介質訪問控制層和物理層的操作及幀結構。接著，作者論述了ofdm的基本原理，以及如何用基於fft和ifft的技術實現ofdm系統。
  9. Secondly, the methods to realize the shaping - filter are introduced, which include the fir algorithm, the fft - ifft algorithm and the symbol sliding - window algorithm. the genetic algorithm ( ga ) is used to optimize the filter coefficients

    接著介紹了成形濾波器的幾種實現方法，包括fir演算法、 fft - ifft演算法和碼元滑動窗演算法，並將遺傳演算法用於確定成形濾波器的系數。
  10. The main hardware - platform is based on the altra ’ s statix series fpga chip ep1s80f1020c5. the realization of the energy dispersal, ldpc - coding, symbol interleaving, constellation mapping, synchro - pn insertion, 3780 - point ifft ofdm, interplation fir, etc have been implemented based on fpga

    系統中能量擴散、 ldpc編碼、符號交織、星座映射、同步pn頭插入、 3780點ifftofdm調制以及信號成形4倍插值滾降濾波器等都是基於fpga硬體設計實現的。
  11. In this paper what is mainly discussed is the hardware implementation of the two application specific information processing modules by cpld or fpga, which are s + p inverse transformation, the inverse transform module of an image compressing system, and 4096 - point complex fft / ifft module, the central module of the digital pulse compressing system

    本文討論的就是應用cpld fpga來實現兩個專用信息處理模塊的設計。它們分別是圖象壓縮系統的圖象反變換模塊? s + p逆變換模塊及數字脈沖壓縮系統的核心模塊? 4096點fft變換模塊。
  12. The various functions inside the virtual spectrum analyzer introduced in the paper is time domain wave analysis, fft transfer, ifft transfer, cross analysis, and so on, which are all described in function controls. finally, this paper introduce the assemble of intelligent controls - oriented virtual instrument. and use classical signals and industrial practices to demostrate the accurate of virtual spectrum analyzer

    本文介紹的智能控制項化頻譜分析儀所具備的功能，有信號的時域分析、 fft變換以及ifft反變換、信號的微積分運算、信號的頻譜分析、信號自功率譜密度函數計算、信號互功率譜密度函數計算、頻率響應函數計算和相干函數計算，都是集成在功能控制項裏面的。
  13. The main work is given as follows : the stepped - frequency waveform synthesizing the wideband signal, the synthetic range profile ( srp ) by ifft, the range resolution of stepped - frequency waveform, the effect of the radial velocity on the srp, the radial velocity compensation, ambiguity function, waveform design and stepped frequency sar imaging and so on

    包括：頻率步進波形合成超寬帶信號分析， ifft方法獲得目標一維距離像與距離解析度分析，徑向速度對目標距離像的影響、速度補償、頻率步進信號的模糊函數分析，以及頻率步進波形照射下的合成孔徑雷達成像、波形設計與系統設計。
  14. Using fourier transformation computational method, the fir filter was designed. the acceleration signal dynamic error was revised through the fft 、 ifft and frequency correction in the operating frequency scope. the signal processing had been realized on dsp, and the signal data was really recorded

    應用傅里葉變換的計算方法，並且完成了fir濾波器的設計，通過傅里葉正反變換和頻率補償實現工作頻率范圍內加速度信號動態誤差修正，在dsp上實現了信號處理，真實地記錄了信號數據。
  15. With the development of dsp chip techniques and the introduction of some mature techniques, such as fft / ifft, the application of 64 / 128 / 256 qam in high - speed modem, tcm, adaptive channel equalization, the insertion of guard interval and so on, people are starting to focus on the application of ofdm in the field of mobile communications

    隨著dsp晶元技術的發展，傅立葉變換反變換、高速modem採用的64 128 256qam技術、柵格編碼技術、軟判決技術、通道自適應技術、插入保護時段、減少均衡計算量等成熟技術的逐步引入，人們開始集中越來越多的精力開發ofdm技術在移動通信領域的應用。
  16. However, to the essential of communication technology, those techniques are all change in transmission medium or channel. recently, because of the development of dsp, ifft / fft, 46 / 128 / 256qam using in high - speed modem, and gradual introduction of new coding technique, soft decision technique, channel self - adapting, guard interval, ofdm ( orthogonal frequency division multiplexing ) arouse more and more attention. as a technology of high - speed transmission, ofdm can resist isi effectively

    近年來，隨著dsp晶元技術的發展，傅立葉變換反變換、高速modem採用的64 128 256qam技術、柵格編碼技術、軟判決技術、通道自適應技術、插入保護時段、減少均衡計算量等成熟技術的逐步引入，正交頻分復用ofdm （ orthogonalfrequencydivisionmultiplexing ）作為一種可以有效對抗信號波形間干擾的高速傳輸技術，引起了廣泛關注。
  17. In the latter, firstly the fact that digital pulse compressing technology is one of the most important ways of signal processing in modern radar is introduced. the module of 4096 - point complex fft / ifft play a very important role in ha rdware implementation of digital pulse compressing system. secondly the basic theory of radix - 4 fft and the hardware implementation based on fpga of the 4096 - point complex fft / ifft is illustrated in detail

    在第二部分中，首先說明了數字脈壓技術是現代雷達中重要的信號處理技術之一，而4096點fft變換模塊就是硬體實現脈壓技術的核心部分，然後說明了基4fft的基本知識以及基於fpga的詳細的硬體實現方案。
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