| Search found 114 matches on edaboard.com: matlab frequency spectrum matlab frequency spectrum matlab frequency spectrum frequency spectrum spectrum frequency response |
need matlab code or codes able to simulate ofdm
k as a telecommunication engineer. i have been making research and preparing thesis regarding with ofdm and its applications for my work . to understand ofdm more and more, i want to simulate it with matlab. if it is possible, could you supply me a m...
Digital communication :: 19 Nov 2009 21:48 :: Aya2002 :: Replies: 2 :: Views: 303
psoc in wireless sensor node
hi all, i am a new designer in psoc.i want to design a wireless node that contains analog input signal connected to psoc microcontroller which should connected by serial max 232 with a wi-fi modulator.can anyone help me ?...
PLD, SPLD, GAL, CPLD, FPGA Design :: 17 Nov 2009 19:57 :: jczarne :: Replies: 7 :: Views: 615
matlab, how to get frequency spectrum?
hi all,i am a matlab newbie :)how to get frequency spectrum of a vector data? (something like [3 4 2 10 ...])i heard fft is the time-frequency fransform. and i tried fft() function in matlab.but it return a complex number. is it stand for both freque...
Electronic Elementary Questions :: 15 Nov 2009 18:42 :: Aya2002 :: Replies: 27 :: Views: 19320
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matlab simulink application that fits the following specs
hello. i am a newbie in matlab simulink. my professor gave me some specifications and parameters and my task is to find suitable application/system to be simulated in matlab by using simulink. below is the specs he gave:input freq: 12khztransistion b...
Digital communication :: 07 Nov 2009 8:22 :: imonline888 :: Replies: 0 :: Views: 84
mtalab magnitude/frequency spectrum viewer
i am newbie to matlab.i have vector of digital samples ,i need to psd-plot the samples continiously playing like movie with given baseband frequency . i can plot samples using plot(abs(vector)) but how to play it slowly like a moving graph/ecg ...
Digital Signal Processing :: 07 Nov 2009 2:13 :: rohit2600 :: Replies: 0 :: Views: 87
matlab program for sfdr!
hi all,i am trying to simulate adc for sfdr,snr,thd and sndr. the matlab code is attached as below. i am new in matlab and couldnt fully understand the program.to simulate, i input low frequency sinewave signal and the adc is running at 50ms/s. shoul...
Analog IC Design & Layout :: 04 Nov 2009 2:34 :: euniceliu :: Replies: 6 :: Views: 3315
matlab code for rayleigh fading channel
can some one help me with matlab code for rayleigh fading channel .thank you...
Digital communication :: 27 Oct 2009 22:57 :: thewinner :: Replies: 4 :: Views: 2871
how to change matlab command
hello everybody...can i ask something...how ca i change this command to display the magnitude spectrum??this command has show low pass filter.. case 1 if(wp>ws) handle=errordlg(wp must be less than ws for lowpass filter,guifilter_...
Digital Signal Processing :: 14 Oct 2009 1:17 :: awanis :: Replies: 0 :: Views: 120
may be some one make use of this topic
sampling---------------------------converting an analog signal to a digital one is a necessary step for a computer toanalyze a signal: modern computers are digital machines, and can store only digital values.in the continuous function x(t), we replac...
Digital Signal Processing :: 28 Sep 2009 18:57 :: Aya2002 :: Replies: 12 :: Views: 2234
how to use aditional mean value in fft matlab????please help
help please!!!!i have sinwave with 0.1 v amplitude and 1khz frequency mixed with 5v white noise.i used fft in matlab to simulate. 1-(study the use of additional mean value calculation of every data set of fft spectrum and how it affects the visibilit...
Digital Signal Processing :: 27 Sep 2009 13:19 :: program2 :: Replies: 0 :: Views: 171
dft x(k) frequency spectrum is not what was expected
hi,can someone tells me how x(k) change f we doubled the sampling freuqency...
Digital Signal Processing :: 25 Sep 2009 13:47 :: awanis :: Replies: 14 :: Views: 459
ofdm with qpsk (matlab simulation code required)
hi,can i get a matlab simulation code for ofdm implementing qpsk modulation..its urgent plz,,,,...
Digital communication :: 24 Sep 2009 9:51 :: puripong :: Replies: 6 :: Views: 1530
need help to implement this matlab code to calculate sfdr..
does anyone have implemented the codes below?im thinking that i put a sine wave as input of my 8-bit adc and take directly the output of my adc..am i right?and lastly how the file test.load look like or how is the arrangement of the data inside? this...
Analog IC Design & Layout :: 21 Sep 2009 15:39 :: kickbeer :: Replies: 2 :: Views: 435
help on fft - where it is used, links to its uses
hi friends,sorry for a strange question, but can anyone tell me where fft is used?i think it would be useful for all the beginners in digital signal processing.please everybody, give, maybe, some links or say (in two words) where you implemented your...
Digital Signal Processing :: 11 Sep 2009 17:07 :: Communications_Engineer :: Replies: 4 :: Views: 554
how to determine sfdr, snr, sndr of adc with ltspice
hello,the standard sfdr is 48dbc. what does it mean, when sfdr is higher than 48dbc or lower than that value?thank you very muchregards,kickbeer...
Analog IC Design & Layout :: 10 Sep 2009 20:56 :: kickbeer :: Replies: 11 :: Views: 774
few clarification on snr/sndr calculation
ion of a sample and hold circuit and then took the fft of the output. ( i did that keeping in mind the proper method of dealing sample data ffts)now i want to calculate the snr/sndr and i want to use matlab. i have following confusion.(i save the fft...
Analog Circuit Design :: 11 Aug 2009 23:58 :: rmiguel :: Replies: 3 :: Views: 522
does upsampling or downsampling change the frequency content
hi ppl,does ups ampling or down sampling a signal change its frequency content.since up sampling increase the number of zero valued samples in the signal i think it should decrease the dc content of the signal. and again as up sampling increaseboth t...
Digital Signal Processing :: 06 Aug 2009 9:48 :: Petre Petrov :: Replies: 7 :: Views: 884
time<->frequency conversions and displaying in matlab
hii know that to convert to frequency domain i need to do the fft and ifft to convert to time domain.but how to display it right in matlab? suppose that i generate signal in time/frequency domain and need to convert to frequency/time domain.---------...
Digital Signal Processing :: 04 Aug 2009 11:39 :: kafentz :: Replies: 1 :: Views: 318
output spectrum components of a pulse width modulated signal
components of a pulse-width-modulated signal. any references or methods would be extremely helpful.since the output of a pwm will have inifinte frequency components, how do we measure its spectrum in matlab. what type of window must be used? any refe...
Digital Signal Processing :: 29 Jul 2009 10:08 :: MiW :: Replies: 1 :: Views: 204
rf microwave tools part 1 - part 64
9705-1.pdf diode model parameter extraction from manufacturers data sheets9708-1.pdf pin diode model parameter extraction from manufacturers data sheetsdbm.zip displays rf power and voltage realtionsnetwork.zip either an ac network anal...
RF, Microwave, Antennas and Optics :: 29 Jul 2009 6:14 :: sivanandyala :: Replies: 5 :: Views: 5552
reading wav file into matlab with wavread;frequency spectrum
hi,i want to read a wav file into matlab using wavread. i then want to be able to output the frequency spectrum, i.e plot of db vs frequency. if i know the sensitivity of the mic i used to record the wav file is it then possible the estimate the actu...
Digital Signal Processing :: 22 Jul 2009 11:39 :: macgabhr :: Replies: 0 :: Views: 213
coherent and noncoherent ..
hi,whats the difference between coherent and noncoherent communications ?...
Digital communication :: 23 May 2009 22:00 :: raoshahid :: Replies: 7 :: Views: 498
need matlab help!!
can anybody help me in making bandpass filter which will pass frequencies between 925 to 970 mhz , and after that pass a square wave in this filter and then check the output frequencies(using fft) and plot the output waveform???thanks:d...
Digital Signal Processing :: 30 Apr 2009 13:36 :: bt87 :: Replies: 13 :: Views: 930
real dft and complex dft in matlab
hi all,i have recently been reviewing dsp (i did dsp at university a number of years ago and am trying to refresh). i have recently just read a textbook i found (not from my university studies) that has been very helpful. in the book they distinguish...
Digital Signal Processing :: 28 Apr 2009 23:11 :: diaks :: Replies: 8 :: Views: 2952
help plzz am running out of time
m studyin computer engineering,im abt to graduate the next 3 months and im very busy with my graduation research,am having a real huge problems and i really need ur help,my first problem is am new to matlab,am using matlaab simulink n am trying to in...
Digital Signal Processing :: 14 Apr 2009 21:12 :: battousai_47 :: Replies: 4 :: Views: 465
matlab simulink - sine wave frequency spectrum problem
tudyin computer engineering, im abt to graduate the next 3 months and im very busy with my graduation research, am having a real huge problems and i really need ur help, my first problem is am new to matlab, am using matlaab simulink n am trying to.....
Embedded Systems and Real-Time OS :: 09 Apr 2009 10:23 :: sau_sol :: Replies: 2 :: Views: 333
matlab truth
hi experts, i have a quistion here, please read the following paragragh as it is in a pdf document on the web:the fourier transform can be computed using the matlab codefk = fft(fn)/n; % the fft of the signal fnfn = ifft(fk)*n; % the inverse fftifft(...
Digital Signal Processing :: 14 Mar 2009 21:08 :: Aya2002 :: Replies: 5 :: Views: 1443
help needed about matlab's windowed fft precision!!
elow,as we know, hann windows spectrum is defined as on the use of windows for harmonic analysis with the discrete fourier transform, f. j. harris, proceedings of the ieee vol.66 no.1, jan. 1978 the matlab script i used (im using matlab r2006b):clos...
Digital Signal Processing :: 10 Mar 2009 8:14 :: rramya :: Replies: 12 :: Views: 912
spectrum analysis with the fft basics and matlab 4 begineers
hi every one,i would like to share some of the uses of fft for spectrum analysis.hope it will be useful for those who are novice to matlab programming.dft notes:dft produces a discrete frequency domain representation.also, dft is only defined in the ...
Digital Signal Processing :: 09 Mar 2009 21:25 :: ILv2Xlr8 :: Replies: 12 :: Views: 2622
help!!! precise spectrum analysis using matlab
i need to get the precise spectrum component of the signal i generated in matlab simulink. the code i use now is shown asfs = 2e6; % sampling frequencyt = 1/fs; % sample timel = 2000000; ...
Digital Signal Processing :: 07 Mar 2009 7:58 :: rramya :: Replies: 1 :: Views: 522
integration best done in time domain or frequency domain?
new to dsp.need to convert a data set from acceleration to velocity.is the integration process best done in time domain or frequency domain? havent found a dsp text that addresses this question....
Digital Signal Processing :: 04 Mar 2009 6:09 :: xulfee :: Replies: 14 :: Views: 1745
interview questions on dsp - open thread - please contribute
hi,most of you mustve already passed that interview stage and some others could be the interviewers themselves. so, i thought this thread should be helpful to everyone and anyone who is not just attending an interview but wants to know more about dsp...
Digital Signal Processing :: 02 Mar 2009 10:25 :: Communications_Engineer :: Replies: 61 :: Views: 12892
matlab problem
hi everyone,is there anyone who knows how to prove the modulation property in discrete time fourier transform?...
Electronic Elementary Questions :: 08 Feb 2009 2:17 :: eng_shady00 :: Replies: 10 :: Views: 540
sound card as analog-to-digital converter
real-time waveform or spectrum of the signal - which can be music, speech, or output from an electronic circuit.did anyone know a good pc program for data acquisition using the sound card? (vb , c++, matlab etc....)thanks...
Digital Signal Processing :: 18 Jan 2009 1:58 :: eng_shady00 :: Replies: 2 :: Views: 438
experts of lecroy scope, fft, and matlab... pls assist!
hello,weve a lecroy waverunner 204xi. recently, i performed the fft (using scope fft function) of a measured signal. however, i found out, when i calculated the fft of the measured signal in matlab, the results are different from that obtained from t...
Electronic Elementary Questions :: 06 Jan 2009 9:45 :: powersys :: Replies: 7 :: Views: 1098
how to obtain power spectrum from eeg raw data
hi all,i am currently doing a project dealing with brain waves acquired from eeg. my concern now is to obtain power spectrum from the raw data, e.g.: i would like to use each power spectrum of alpha wave (8-13hz), beta wave(14-19hz) and gamma wave(20...
Digital Signal Processing :: 20 Sep 2008 9:55 :: manish12 :: Replies: 3 :: Views: 323
cro + matlab = spectrum analyzer ?
hii took the picture attached from cro and i want to analyze it using matlab to know the harmonic components in iti dont have a spectrum analyzer so i want to use matlab to do this function.any help??regards...
Software Problems, Hints and Reviews :: 05 Jul 2008 5:50 :: kender :: Replies: 7 :: Views: 570
spectrum of digital levels.
hi!please somebody resolve my problem of finding the spectrum of logic levels obtained form adc output.i am actually testing a rf chip where i gave input as sine wave and obtained the output form adc placed at the end of receiver chain.but to confir...
Digital communication :: 26 May 2008 9:12 :: echo47 :: Replies: 7 :: Views: 306
usb1 access using matlab
can someone please tell me how to access the usb port using matlab? is there some similar mechanism available like the serial class?i am able to access it using java, but i am facing some problems.thanks a whole lot in advance....
Digital Signal Processing :: 07 May 2008 5:40 :: akrcal :: Replies: 5 :: Views: 900
plotting frequncy plot reading values from excel file
excel filei want to plot time and frequency plots reading from excel file.the following lines are helpful for reading from excel file and selecting perticular column also.time = xlsread(d:\installed\matlab\work\tone.xls,-1);%num;inp = xlsread(d:\ins...
Software Problems, Hints and Reviews :: 24 Feb 2008 14:34 :: dspman :: Replies: 1 :: Views: 314
matlab quries ?
i want to design the voice security .for that i use spectrum inversion .i want to know that , is there any mixer in matlab toolbox for getting the frequency inversion ,for ex :- mic -> mixer > 4 bands > select the desired band > this out put connect...
PC Programming and Interfacing :: 06 Feb 2008 14:33 :: manish12 :: Replies: 0 :: Views: 145
help on card sound
hi, i would like to know the relationship between the sounding intensity in db and the output voltage of the sound cardthankk you...
Software Problems, Hints and Reviews :: 06 Feb 2008 14:18 :: Foufou :: Replies: 14 :: Views: 440
job openings for mems design engineers at sws
job openings for mems design engineers at si-ware systems (sws)job ref code: mem-108about si-ware systemssi-ware systems (sws) is an independent egyptian fabless company providing a wide spectrum of asic design and development solutions from initial ...
EDA Jobs, Promotions, Advertising :: 27 Jan 2008 8:05 :: mosmed :: Replies: 0 :: Views: 765
spread spectrum clock generation
hello,im currently working with an electronic product that utilizes sscg (spread spectrum clock generation).can someone explain the concept of this technology. i have a shallow understanding with this.thanks!...
Analog Circuit Design :: 26 Jan 2008 3:12 :: CaPsLoCkE :: Replies: 6 :: Views: 341
cyclic spectral estimator (matlab)
cyclostationarity is a common property of man-made digital signals that has a vast number of uses in digital communications: http://spincom.ece.umn.edu/papers04/bib05eurasip.pdfto make use of cyclostationarity it is necessary to estimate the cyclic c...
Digital communication :: 08 Jan 2008 16:05 :: AARTHIREDDY :: Replies: 2 :: Views: 585
help me to analyse spectrum of discrete signal in matlab
it which fsample =40hz, and i recieve 200 pieces of that signal into my computer by sampling which f(sample) =40hz.and my problem is how i can analyse spectrum of those 200 pieces discrete signal in matlab.plz help me some code matlab or tell me whi...
Electronic Elementary Questions :: 18 Dec 2007 6:41 :: cesare :: Replies: 4 :: Views: 238
kindly help me in sampling this bandpass signal...
simply i have taken a four channel amplitude modulated signal for my test purpose. the broadcast range of am is from 535khz-1700khz..(for now i have just chosen four random carriers at which the signal is being modulated). infact i m going to sample ...
Digital Signal Processing :: 01 Dec 2007 18:41 :: ednan :: Replies: 6 :: Views: 282
getting coefficiency of fft spectrum use matlab
hello.. i am noob in using matlab.. and i try to find many source and coding d. but still donno how to get the fft co-efficiency using cheby2.i record my voice in .wav and i try to get the co-efficiency of the fft frequency spectrum. below is some of...
Software Problems, Hints and Reviews :: 09 Nov 2007 16:58 :: pokyeah85 :: Replies: 0 :: Views: 123
how to perform fft analysis
hello, everyone,can anyone tell me how to perform fft (fast fourier transform) analysis with hspice integrated in cadence analog artist development environment. is there any special option within this tool ? i only find four analysis options : dc ,ac...
Analog Circuit Design :: 01 Oct 2007 12:04 :: sankudey :: Replies: 10 :: Views: 774
projects on dsp applications
i need some topics that are related to projects on dsp applications...
Digital Signal Processing :: 03 Sep 2007 10:58 :: t.m.keerthi :: Replies: 13 :: Views: 1620
how do i analyzing frequency using matlab
i want to analyze frequency which is recorded in matlab using wavrecord command ,what is the highest frequency (for select best sampling rate next time recording)reduced noiseunderstand behavior of frequencyplz anybody knows those thing post it for ...
Digital Signal Processing :: 29 Aug 2007 3:01 :: brmadhukar :: Replies: 2 :: Views: 183
heterodyne signal processing
hi,i am trying to capture a signal from an experiment with a detector. this signal has a particular frequency, about 5khz, the spectral width should not be more than 0.2khz. i am trying to capture and record the amplitude of this signal. i have a dig...
Electronic Elementary Questions :: 23 Aug 2007 14:37 :: watertreader :: Replies: 0 :: Views: 162
help me in matlab code ...
st , yet not cleared.... i m posting some of my results(pics) of the above code , plz try download it and try to explain me from these ........ 1) first the original signal in text form ,i read it in matlab 2) the fft of the origial signal ( this giv...
Digital Signal Processing :: 07 Aug 2007 7:58 :: vjfaisal :: Replies: 5 :: Views: 216
first step in dsp
hi! i know a bit of theory about dsp and i want to take my skills to a higher level. more exactly, i plan on understanding a signal from a wave. and later, recomposing a similar signal, from a function.my problem is that i dont know where to start. i...
Digital Signal Processing :: 06 Aug 2007 8:10 :: rajsrikanth :: Replies: 3 :: Views: 324
undersampling
i dont understand how the sampling frequency depends on the band width .... and not the maximum frequency component.....according to document by national semicon.can anyone explain it in detail or suggest some document related to it....
Digital Signal Processing :: 05 Aug 2007 19:30 :: echo47 :: Replies: 21 :: Views: 621
modulation recognition algorithm
hi, can anyone proivide me with any algorithm that can detect modulation scheme of a signal in matlab...
Digital Signal Processing :: 01 Aug 2007 15:22 :: bulx :: Replies: 3 :: Views: 333
separation of signal from noise in sigma delta adc
hi, i am working on sigma delta modulator based adc.i have output bitstream from the modulator and would like to measure snr and sndr using fft. how could i possibly separate the signal and noise from the output of modulator?also, is there anyway to ...
Digital Signal Processing :: 28 Jul 2007 21:28 :: Dmitrij :: Replies: 3 :: Views: 408
spread spectrum: matlab debug
hi, friends, i write a matlab program to simulate the spread spectrum result. fft is used to view the spectrum of the modulated signal. the spectrum should be same with differenct sample points. in the matlab program, tstep and tstop will dicide the ...
Analog Circuit Design :: 18 Jul 2007 16:00 :: hmsheng :: Replies: 0 :: Views: 282
divider
hi everybody,i have a question regarding the divider: say i have a divider working at 2ghz, for some reason, there is another signal is added to this 2ghz, (say 2.1ghz), i am wondering whether or not this divider will divide this 2.1ghz? or can i see...
RF, Microwave, Antennas and Optics :: 15 Jul 2007 2:14 :: echo47 :: Replies: 5 :: Views: 306
help me in fft normalization!!
hiplease help me , if anyone knows q1: how to normalize the fft plot.q2: how to convert fft normalize frequency in hertz along x-axisplease help me in these questions....best regards...
Digital Signal Processing :: 09 Jul 2007 14:43 :: vibcon :: Replies: 4 :: Views: 873
eliminate the noise
hi friendi use fft function of matlab to a non-stationary signal and get the below figure and i want now to elimnate the noise i think it is a white noise i test the butterworth filter function but i can to eliminate this noisehttp://www.warst.com/im...
Digital Signal Processing :: 08 Jul 2007 4:21 :: echo47 :: Replies: 8 :: Views: 315
spectrum analysis code in matlab(urgently required)
i m new in matlab so i want code of spectrum analysis in matalb i need it urgently ...
Digital Signal Processing :: 03 Jul 2007 13:49 :: echo47 :: Replies: 49 :: Views: 8250
need help in matlab ( how to convert in microvolt)
hi i have got a problem in converting my y-axis in microvolts.as i have use, the normaized frquency (along x-axis ) and measure voltage along (y-axis), i have normalized my both axis, now i wnt to be my y-axis normalizes range be in micro volts.so p...
Digital Signal Processing :: 02 Jul 2007 6:05 :: echo47 :: Replies: 16 :: Views: 453
help with calculation of ifft in matlab
hii,im generating a text file in labview which contains the real and imaginary parts of intensity of a signal and i wish to calculate its ifft and come in time domain.i have 201 points in the frequency range of 0ghtz to 10ghtz.i need to first create ...
Digital Signal Processing :: 26 Jun 2007 5:36 :: echo47 :: Replies: 1 :: Views: 621
find the frequency spectrum before and after sampling
i do not seem to understand how sampling affects the frequency spectrum. help me find the frequency spectrum before and after sampling. how to do it in matlab? i am interested in frequencies from 0~integer*sampling frequency. i want to see how differ...
Digital Signal Processing :: 18 Jun 2007 3:10 :: Sal :: Replies: 1 :: Views: 183
how to measure the dynamic specifications like sinad of adc?
hi all..i am trying to measure the dynamic specs of 8 bit pipeline adc in spectre ..to perform the measurement i give a sinusoidal input of 1.245mhz and my clock frequency is 15.360 mhz...i ve derived these values with the relation fin/fsample=nwindo...
Analog Circuit Design :: 01 Jun 2007 9:42 :: geethki :: Replies: 4 :: Views: 762
dsp problem - help
can anyone please give me a solution of the following problem?thanks!implementation of a filter in c-------------------------------------------1.) realize a transversal filter routine such that for every input an output is created. the length of the...
Digital Signal Processing :: 17 May 2007 10:46 :: snoopfan :: Replies: 0 :: Views: 258
help matlab 3d representation
hi everybody,i need some help in 3d representation, i read the help , but i didnt find the fonction that i need , this function represent signal in 3d like in this filethannnnnnnnnnnnx...
Digital communication :: 18 Apr 2007 9:54 :: Nab :: Replies: 6 :: Views: 2583
how to display time domain signal in frequency domain?
hi friends, i am trying to display time domain signal in frequency domain using matlab.i took frequency of signal as 100hz and sampling frequency as 1000sampels/seci have tried using fft function but not getting.anyone of you give me the solution ...
Digital Signal Processing :: 27 Feb 2007 16:18 :: ricksidd :: Replies: 3 :: Views: 276
generating and testing awgn???
hi all, i want to generate white noise phisically to test my filters.i used the matlab commands (wgn(),sound()) to generate the noise using the sound card .but when i tested the fft of the output signal the spectrum is not flat which it should be.is...
Digital Signal Processing :: 19 Feb 2007 14:48 :: Sal :: Replies: 1 :: Views: 123
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