frequency response of discrete time filters
Báo cáo hóa học: " Charge-Domain Signal Processing of Direct RF Sampling Mixer with Discrete-Time Filters in Bluetooth and GSM Receivers" docx
... in size while enabling the software-defined radio (SDR) of the future The organization of this paper is as follows Section presents discrete- time signal processing of the RF front-end mixer with ... by decimation) are merely due to the sampling time interval expansion of this discrete- time system (the sampling rate of the input is at the RF frequency) : Gv,tma = Gq,tma = N In the following ... propagate, therefore it is of less importance for signal processing analysis The charge discrete signal processing gain of the second IIR stage is Frequency response of the temporal MA8, IIR−1,...
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06 Quantization of Discrete Time Signals
... infinite set of possible signals is converted into a finite set The next step of encoding maps the finite set of discrete time, continuous amplitude signals into a finite set of discrete time, discrete ... Z as its domain A discrete time, continuous amplitude signal has R as its range A discrete time, discrete amplitude signal has Z as its range Here, the focus is on discrete time signals Quantization ... discrete time signals Quantization is the process of approximating any discrete time, continuous amplitude signal into one of a finite set of discrete time, continuous amplitude signals based on a...
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Báo cáo hóa học: " Research Article Stabilization of Discrete-Time Control Systems with Multiple State Delays" doc
... the global exponential stabilizability of discrete- time systems with time- delayed states Finally, as an application, we consider the global stabilization of the nonlinear control systems Preliminaries ... 37, no 2, pp 521–542, 1999 10 E K Boukas, “State feedback stabilization of nonlinear discrete- time systems with time- varying time delay,” Nonlinear Analysis: Theory, Methods & Applications, vol ... theorem for discrete- time systems,” IEEE e Transactions on Automatic Control, vol 41, no 6, pp 903–907, 1996 12 E N Chukwu, Stability and Time- Optimal Control of Hereditary Systems, vol 188 of Mathematics...
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Báo cáo hóa học: " Research Article Absolute Stability of Discrete-Time Systems with Delay" pdf
... stability of time- dependent difference equations in Banach spaces,” Journal of the Institute of Mathematics and Its Applications, vol 14, no 3, pp 335–346, 1974 11 S Zhang, “Estimate of total stability ... 1978 J Dibl´k and D Ya Khusainov, “Representation of solutions of discrete delayed system x k ı Ax k Bx k −m f k with commutative matrices,” Journal of Mathematical Analysis and Applications, vol ... stability of the system xn Axn−1 Bxn−k , 4.3 where A, B are m×m-matrices, xn ∈ Rm By means of a characteristic equation, they established many results concerning the stability of the solutions of such...
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ON MONOTONICITY OF SOLUTIONS OF DISCRETE-TIME NONNEGATIVE AND COMPARTMENTAL DYNAMICAL potx
... QG(x) ≤≤ 0, x ∈ R+ Then ˆ the discrete- time, nonlinear nonnegative dynamical system Ᏻ is partially monotonic with ˆ respect to x Proof The proof is similar to the proof of Theorem 3.2 with Proposition ... and QB ≤≤ are nonnegative Then the discrete- time, linear nonnegative dynamical system given by (2.1) is monotonic ˆ Proof The proof is a direct consequence of Theorem 3.2 with n = n and {k1 , ... ≤≤ Q ˆ Proof The proof is a direct consequence of Theorem 3.4 with n = n and {k1 , ,kn } = ˆ {1, ,n} Finally, we present a sufficient condition for weighted monotonicity for a discrete- time, linear...
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Báo cáo toán học: "Maximizing the Stability Radius of Discrete-Time Linear Positive Systems by Linear Feedbacks" ppsx
... of interest to consider conditions of robust stability of a polytope of matrices It is well known that, in general, the stability of all vertex matrices is not sufficient for robust stability of ... Stability radii of linear discrete- time systems and symplectic pencils, Inter J Nonlinear and Robust Control, (1991) 79–97 11 D Hinrichsen and N K Son, Stability radii of positive discrete- time systems ... (Eds.) Control of Uncertain Systems, Vol of Progress in System and Control Theory, Birkh¨user, Basel, 1990, 119-162 a D Hinrichsen and A J Pritchard, On the Robustness of Stable Discrete- Time Linear...
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Adaptive neural network control of discrete time nonlinear systems
... behavior of 1.1 Adaptive Neural Network Control of Nonlinear Systems discrete- time models and continuous -time models In this section, the development in adaptive NN control of discrete- time nonlinear ... control for time- varying discrete- time systems was investigated Compared with those results obtained for SISO discrete- time systems, fewer results can be found for MIMO discrete- time system For ... is of no use; (ii) propose a different kind of neural network weight update law for discrete- time systems; (iii) propose a modified discrete- time projection algorithm compare to continuous-time...
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báo cáo hóa học: " The investigation of frequency response for the magnetic nanoparticulate assembly induced by time-varied magnetic field" ppt
... with the frequency increasing, the magnetic relaxation time of cluster is more and more Page of above the period of external field (The relaxation time is constant while the period of field is ... than that of nanoparticulate cluster The relaxation time of 11-nm particle was calculated to be 0.004 ms, far below the periods of external field of any frequency It means that the variety of magnetic ... abovementioned analysis, when the frequency of external field is low enough, the field will be incapable of inducing the assembly of magnetic Figure SEM images of DMSA-coated g-Fe2O3 nanoparticles...
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báo cáo hóa học:" Whole blood assessment of antigen specific cellular immune response by real time quantitative PCR: a versatile monitoring and discovery tool" potx
... of the reported values were omitted A threshold of 2-fold increase in specific gene expression over control values was considered as cut-off for the definition of positive responses Numbers of ... axes) Page of (page number not for citation purposes) Journal of Translational Medicine 2008, 6:58 However, the correlation of specific profiles of cytokine gene expression with markers of protection ... dynamic linear range of expression-detection was consistent at least up to Ct value of 35 which was therefore considered as the cut-off of significant values A threshold of 2-fold increase in...
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Báo cáo sinh học: " Performance evaluation of space-time-frequency spreading for MIMO OFDM-CDMA systems" ppt
... open-loop MIMO OFDM-CDMA scheme using space-timefrequency spreading (STFS), in the presence of frequency- selective Rayleigh-fading channel The BER and BLER performance of the OFDM-CDMA system ... time n 3) Time -Frequency mapping : The output of the space -time spreading is then mapped in time and frequency before IFFT Fig describes the Time -Frequency mapping method used in this system for ... in time has transformed the effective channel response j-th receive antenna to hs as shown in Equation (6) instead of the j addition of all channel responses This will maximize the number of...
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Báo cáo toán học: " Performance evaluation of space-time-frequency spreading for MIMO OFDM-CDMA systems" pptx
... user k from antenna i at time n 3) Time -Frequency mapping The output of the space -time spreading is then mapped in time and frequency before IFFT Figure describes the Time -Frequency mapping method ... spread in time and frequency, occupying different time and frequency slots, where each bit is spread to ensure frequency independence as shown in Figure Also, other systems that use space -time -frequency ... in time has transformed the effective channel response j-th receive antenna to hs as shown in Equation (6) instead of the j addition of all channel responses This will maximize the number of...
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Báo cáo hóa học: " On a boundary value problem of a class of generalized linear discrete-time systems" ppt
... The aim of this article was to give necessary and sufficient conditions for existence and uniqueness of solutions for generalized linear discrete- time boundary value problems of a class of linear ... vectors the p linear independent eigenvectors of the finite generalized eigenvalues of sF-G (see [1] for an algorithm of the computation of Qp) Proof Let Q = [QpQq], where Qp ∈ Mmp and Qq ∈ Mmq ... Page of The matrix pencil theory has extensively been used for the study of linear difference equations with time invariant coefficients, see for instance [1-5] A matrix pencil is a family of matrices...
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Báo cáo hóa học: "Research Article Discrete-Time Modelling of the Moog Sawtooth Oscillator Waveform" doc
... −1 −1 Time (ms) 10 12 0.5 (a) (b) Level Level −1 −1 Time (ms) 10 12 0.5 (d) Level Level −1 −1 Time (ms) 10 12 0.5 Time (ms) (e) (f) Level Level Time (ms) (c) 0 −1 −1 Time (ms) 10 12 0.5 Time (ms) ... papers have dealt with discrete- time modelling of an analogue oscillator In this paper, two new discrete- time models for the Moog sawtooth oscillator suitable for realtime implementation were ... M-Audio Quattro audio interface with sampling frequency 44100 KHz and resolution of 16 bits Two novel discrete- time modelling strategies well suited for real -time implementation are proposed The proposed...
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Báo cáo sinh học: " Research Article Time-Frequency Characterization of Cerebral Hemodynamics of Migraine Sufferers as " pptx
... from the time course of the signals, the other discriminant variables are linked to the frequency content of the NIRS oxygenation signals From a methodological point of view, the use of timefrequency ... in realtime The herein proposed time -frequency methodology is currently under testing in the Department of Neuroscience of the Gradenigo Hospital of Torino, Italy Conclusion The time -frequency- based ... the cross time -frequency CW representation of the O2 Hb and HHb concentration signals, Dxx (t, f ) is the time -frequency CW representation of the O2 Hb signal, and D y y (t, f ) that of the HHb...
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Báo cáo sinh học: " Research Article Approximating the Time-Frequency Representation of Biosignals with Chirplets" pot
... representation Frequency Frequency EURASIP Journal on Advances in Signal Processing Time Time Frequency (b) Frequency (a) Time Time (d) Frequency (c) Time (e) Figure 2: (a) Spectrogram of a frequency- modulated ... 1.5 Time (s) 2.5 ×10−3 (a) 6 5 Frequency (Hz) ×104 Frequency (Hz) ×104 4 2 1 0 Time (s) 0.5 ×10−4 (b) 2.5 ×10−3 (c) ×104 7 6 5 Frequency (Hz) ×104 Frequency (Hz) 1.5 Time (s) 4 2 1 0 0.5 1.5 Time ... where α > is time spread of the signal, t0 is center of time, ω0 is center of frequency, and β is the chirp rate [39] f (t) is normalized to have unit energy The Wigner-Ville distribution of f (t)...
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Báo cáo hóa học: " Research Article Space-Time-Frequency Characterization of 3D Nonisotropic MIMO Multicarrier Propagation Channels Employing Directional Antennas" doc
... value of the FSCs of these APPs, where h = c/2 f and the carrier frequency of ω = 2π f We observe that for these antennas, the value of Gk1 ,k2 is considerable only for a limited number of coefficients ... product form of the CCF and because the response of the employed antenna array (in terms of the carrier frequency) could be taken into account, separately The CB characterizes the behavior of multicarrier ... depend on the response of the APP main-lobes of two directional antennas and the type of propagation on the azimuth and the elevation, that is, the SC is a function of the parameters of the AAS...
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Báo cáo hóa học: " Research Article Time-Frequency Analysis of Heart Rate Variability for Neonatal Seizure Detection" pdf
... 30 Time (s) 1.5 10 20 30 40 50 60 Time (s) 10 20 30 40 50 60 Time (s) (c) (c) Figure 5: The central frequency of the LF, MF, and HF of the HRV Figure 6: The variance of the LF, MF, and HF of ... their frequency content varies with time) , a more global analysis method that represents this type of signals in both time and frequency domain simultaneously is needed One of the earliest used time -frequency ... improve the performance of classification of nonstationary time series compared to those moments based on time or frequency alone Table 1: TFDs and their corresponding kernels TIME -FREQUENCY DISTRIBUTIONS...
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Báo cáo hóa học: "MULTIPLE PERIODIC SOLUTIONS FOR A DISCRETE TIME MODEL OF PLANKTON ALLELOPATHY" potx
... the recent work of Fan and Wang [4] and Chen [3], we study the existence of multiple positive periodic solutions of the difference equations derived in Section 2 Discrete analogue of system (1.2) ... 0,1,2, Equation (2.3) is a discrete analogue of system (1.2) Notice that the periodicity of parameters of (2.1) is sufficient, but not necessary for the periodicity of coefficients in (2.3) In system ... Periodic solutions for a discrete plankton model Naturally, more realistic models require the inclusion of the periodic changing of environment (e.g., seasonal effects of weather, food supplies,...
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Báo cáo hóa học: " Research Article An Approach for Synthesis of Modulated M-Channel FIR Filter Banks Utilizing the Frequency-Response Masking Technique" ppt
... first regard the magnitude response of the prototype filters and the phase response of Pa (e jωT )Ps (e jωT ) (properties (1) and (2) in Section 3.3) The frequency responses of G(e jωT ), Gc (e jωT ... (z)Hsk (z) In the appendix, it is shown that the frequency response of the distortion function can be expressed using the zero-phase frequency response V0R (ωT) as ( GR−k) (LωT) + G(−k) (LωT) ... total delay of the filter parts of the different FBs is given, as well as the number of distinct filter coefficients to optimize When the number of channels is doubled, the transition bands of the masking...
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