frequency domain analysis comsol

Frequency-Domain Analysis

... book.150 FREQUENCY- DOMAIN ANALYSIS xlabel(’Normalized frequency )subplot(1,2,2)plot(w,HdB);gridtitle(’Magnitude in dB of the frequency response’)ylabel(’Magnitude in dB’)xlabel(’Normalized frequency )figure(2)subplot(1,2,1)plot(w,ph);gridtitle(’Phase ... 2πk)120 FREQUENCY- DOMAIN ANALYSIS There is some ambiguity in the published literature regarding the definition ofwhat is called the Nyquist frequency. Most of the books define half the sampling frequency ... 3.15,respectively.148 FREQUENCY- DOMAIN ANALYSIS Suppose that we are given the transfer function of an IIR filter:H(z−1) =Mk=0bkz−k1 +Nk=1akz−kThere are two equivalent approaches to find the frequency...

Time-Domain Analysis and z Transform

Danh mục: Kỹ thuật lập trình

... 3)CHAPTER 2Time -Domain Analysis and z Transform2.1 A LINEAR, TIME-INVARIANT SYSTEMThe purpose of analysis of a discrete-time system is to ﬁnd the output in eitherthe time or frequency domain of ... and model it byequations in the z domain, instead of the equivalent model given by equations(2.1) in the time domain. This example is chosen to illustrate the analysis of adiscrete-time system ... natural frequency equal to (0.2) and theterm −0.088(0.1)nu(n) with the natural frequency of (0.1), while the zero stateresponse y0s(n) also contains the term 0.5(0.2)nu(n) with the natural frequency of(0.2)....

lecture chapter 4 frequency domain processing

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... Fourier transform (DFT)Inverse Fourier transform (IDFT)An M-function Filtering in the Frequency Domain function g = dftfilt(f, H)F = fft2(f, size(H, 1), size(H, 2));% Perform filtering.g ... 1 2 58 5 4 5 8clear all;clc[U, V] = dftuv(5, 5);D2=U.^2+V.^2D2c=fftshift(D2)Obtain Frequency Domain Filters from Spatial Filtersh= fspecial ('sobel')h =1 2 10 0 0-1 -2 -1Paddedsize ... sigma);G=H.*F;g=real(ifft2(G));subplot(2, 2, 3)imshow(g(1:size(f),1:size(f)))subplot(2, 2, 4)imshow(g)Obtain Frequency Domain Filters from Spatial Filters2D Fourier transform and its inverse1 12 ( / / )0 0(...

lecture chapter4 frequency domain processing

Danh mục: Tin học

... the frequency domain. Filtering in frequency domain Original signalLow-pass filteredHigh-pass filteredfunction [U, V] = dftuv(M, N)function [U, V] = dftuv(M, N)%DFTUV Computes meshgrid frequency ... …'FontSize',14) Obtain Frequency Domain Filters from Spatial FiltersThe syntax: H = freqz2 (h, R, c)Where h is a 2-D spatial filter and H is the corresponding 2-D frequency domain filter. Consider ... 0.0000Filtering in the frequency domain The convolution theorem:Linear spatial convolution is by convolving f(x,y) andh(x,y). The same result is obtained in the frequency domain by multiplying...

báo cáo hóa học: " Time and frequency domain methods for quantifying common modulation of motor unit firing patterns" pot

Danh mục: Hóa học - Dầu khí

... purposes)Regression plots for low frequency common drive time versus frequency domain techniquesFigure 4Regression plots for low frequency common drive time versus frequency domain techniques. Regression ... between the time and frequency domain estimates.The use of a short duration window in the time domain method results in the inclusion of multiple frequencies inthe time domain correlation estimation ... recordings.One is a frequency domain method and uses the coherence function to determine the degree oflinear correlation between each frequency component of the signals. The other is a time domain method...

Báo cáo hóa học: " Frequency-domain equalization for OFDMA-based multiuser MIMO systems with improper modulation schemes" docx

Danh mục: Hóa học - Dầu khí

... in the frequency domain. IEEE Trans Commun. 53(1), 110–121 (1995)5. N Benvenuto, S Tomasin, On the comparison between OFDM and singlecarrier modulation with a DFE using a frequency domain feedforward ... structure for orthogonal frequency division multiple access-baseduplink multiuser multiple-input multiple-output systems. The numerical results show that the proposed frequency- domain equalization ... multiple-input multiple-output (MIMO), frequency- domain equalization1 IntroductionMultiple-input multiple-output (MIMO) techniques incombination with orthogonal frequency division multipleaccess...

Báo cáo hóa học: " Frequency domain equalization space-time block-coded CDMA transmission system" pdf

Danh mục: Hóa học - Dầu khí

... in frequency- selectivechannels. Some STBC schemes to deal with frequency selectiv ity have been proposed for orthogonal frequency division multiplexing (OFDM) [6], single-carrier (SC)time -domain ... detectionover frequency- selective channels due to intersymbolinterference (ISI). In [11], adaptive algorithms to miti-gate ISI effects for frequency domain equalization (FDE)in frequency- selective ... transmissionover frequency- selective fading channels. IEEE Trans Inf Theory 49(1),164–179 (2003). doi:10.1109/TIT.2002.80615822. S Zhou, G Giannakis, Space-time coding with maximum diversity gains over frequency- selective...

Báo cáo hóa học: " Research Article Novel Techniques of Single-Carrier Frequency-Domain Equalization for Optical Wireless Communications" doc

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... sin-gle carrier with frequency domain equalization systems havebeen proposed in optical communication as an alternativeto OFDM [12, 13]. In [12], single carrier frequency domain EURASIP Journal ... al., Frequency- domain equalisation for optical transmission systems,” ElectronicsLetters, vol. 44, no. 14, pp. 870–872, 2008.[13] C C. Hsieh and D S. Shiu, “Single carrier modulation with frequency ... vectorSI=SI+−SI−,SQ=SQ+−SQ−.(29)The frequency domain transmitted symbols S are thenestimated asS =SI+ jSQ, (30)where j=√−1. We then obtain the time domain signal bythe taking an...

Báo cáo hóa học: " Research Article Frequency-Domain Block Signal Detection with QRM-MLD for Training Sequence-Aided Single-Carrier Transmission" pptx

Danh mục: Hóa học - Dầu khí

... time -domain equalizationschemes have been proposed in [9, 10].Recently, we proposed a near ML-based reduced com-plexity frequency- domain equalization scheme, which iscalled frequency- domain ... becomes extremely high in a severely frequency- selective channel [2]. Therefore, several suboptimal lineardetection schemes, such as time -domain and frequency- domain linear equalization schemes, ... and cost analysis, ” IEEE Transactions on Communica-tions, vol. 32, no. 2, pp. 169–176, 1984.[17] K. Takeda, H. Tomeba, and F. Adachi, “Joint Tomlinson-Harashima precoding and frequency- domain...

Báo cáo sinh học: " Research Article Iterative Frequency-Domain Channel Estimation and Equalization for Ultra-Wideband Systems with Short Cyclic Preﬁx" pot

Danh mục: Điện - Điện tử

... isrequired. Another FFT operation is required for the transfor-mation of the time -domain IBI term into frequency- domain. Notice that exact computation of the tanh(·)functioncanbe costly, however ... Blanchi, Frequency domain detectors forultra-wideband indoor communications,” IEEE Transactionson Wireless Communications, vol. 5, no. 10, pp. 2654–2658,2006.[8] S. Morosi and T. Bianchi, Frequency ... Bhargava, Frequency- domain turboequalization and multiuser detection for DS-UWB systems,”IEEE Transactions on Wireless Communications,vol.7,no.9,pp. 3280–3284, 2008.[11] Y. Wang and X. Dong, Frequency- domain...