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skin effect of transients versus skin effect of sine wave
how can i calculate the skin effect or rather the depth of the skin effect in a large conductor when the current is high voltage transients. i can find tables and formulas for skin effect of sine waves, but not for transients....
Electronic Elementary Questions :: 22 Nov 2009 15:47 :: Monolith :: Replies: 13 :: Views: 279
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: 300
cognitive radio in matlab
hi,can anyone help me with a matlab code for spectrum sensing (cooperative) for cognitive radio?thanks,priya...
Digital communication :: 18 Nov 2009 8:41 :: kaleem.ullah :: Replies: 1 :: Views: 123
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: 19317
mc cdma algorithm
is there anyone here have a simple mc cdma matlab code.... with any specification.....i just want to have a brief idea.....thanks a lot...
Digital Signal Processing :: 14 Nov 2009 6:26 :: Communications_Engineer :: Replies: 7 :: Views: 2052
matlab programing + gaussian finction
hi guys this is my first time in here but i think this is an wonderful site so i have decided to share with you my experiance in matlab, i will be posting certian programs in matlab and u can ask me anything you want to know. i will later tell you wh...
Digital communication :: 12 Nov 2009 7:20 :: Communications_Engineer :: Replies: 95 :: Views: 13948
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: 81
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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
mc-cdma simulation in matlab (chaotique sequences)
i need to simulate mc_cdma using matlab,exacte costruction of chaotique sequences in mc-cdma systems .please help....
Digital communication :: 06 Nov 2009 17:48 :: Aya2002 :: Replies: 19 :: Views: 501
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: 3312
cdma matlab simulation
hi there,i have some questions regarding a cdma matlab simulation result.figure1 here represents the fft convertion of a randomly generated baseband signal up to 1000 bits. on the other hand, the figure2 here is the fft conversion of the baseband sig...
Digital communication :: 31 Oct 2009 16:04 :: vadherasiddharth :: Replies: 8 :: Views: 5553
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
matlab vs labview
whats the difference between these two? can anyone explain it?thanks...
Software Downloads/Uploads :: 04 Sep 2009 7:55 :: Qaiser :: Replies: 43 :: Views: 12876
removing dc component of a signal
hi,i want to normalize a signal and generate the power spectrum in matlab sp tool box. i used following command to normalize the signal.=x1-mean(x1);but, still there is very big dc components appears in the power spectrum. can you please explain me h...
Digital Signal Processing :: 31 Aug 2009 9:07 :: doraemon :: Replies: 4 :: Views: 477
nco simulation in matlab to high sfdr
hello. i have a weird problem (or not?) with my nco simulation in matlab (fixedpoint toolbox).i have no need for freq. resolution and 2^9 (<1 deg angle resolution) accumulator suits my need.so basically i dont need / have phase truncation. what bo...
Digital Signal Processing :: 25 Aug 2009 22:16 :: Mad I.D. :: Replies: 0 :: Views: 124
cognitive radio help required
helloim working on spectrum sensing techniques in cognitiveradio...it is an emerging topic and we dont find any codesor any help for it. im also facing problems as i have tostart fresh...if anyone has any codes related to it could uplease send me som...
Digital communication :: 18 Aug 2009 6:09 :: xtcx :: Replies: 11 :: Views: 464
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: 881
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
distance spectrum in rcpc code
dear all,can someone please help me how to calculate the distance spectrum for rcpc code using matlab? matlab has this command: distspec(trellis,n) which returns the distance spectrum of a trellis, but i still cant figure out how to use it to return ...
Software Problems, Hints and Reviews :: 01 Aug 2009 11:31 :: bebisekit :: Replies: 0 :: Views: 164
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: 5549
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
egypt vlsi
hi every oneok im a fresh graduate my project was a vlsi digital design. im intrested in that field and i want to build up my career in it. can you help me guys with information about... -what to do?-names of companies?-addreses..... and so on.thanks...
EDA Jobs, Promotions, Advertising :: 14 Jul 2009 19:19 :: mai ahmed :: Replies: 95 :: Views: 12410
matlab 7.5 not compatible with ccs 3.1?
into executable code for c6713 dsp however after the following the steps mentioned in the examples given by dr. yoder in his files uploaded at mathworks.com, i am getting an error that my version of matlab (link for c6000) is not compatible with ccs...
Digital Signal Processing :: 27 Jun 2009 7:47 :: Communications_Engineer :: Replies: 1 :: Views: 321
spectral analysis parametric and non-parametric methods
hi all i m a begginer in matlab and i need a little helpi want to compare parametric and non-parametric methodsi need the code of a signal and then the code how to take the psd of this signal with parametric or non-parametric method..and see which me...
Digital Signal Processing :: 19 Jun 2009 11:36 :: seifer :: Replies: 4 :: Views: 507
spectrum analyzer using matlab and rs232
hi i want to make a spectrum analyzer that takes input physically through probes ..filters it converts the filterd output to digtal and displays the output in matlabinitially the input will be either a sine ,square or triangular wave a similar projec...
PC Programming and Interfacing :: 17 Jun 2009 11:49 :: engr_najam :: Replies: 1 :: Views: 399
how to use window function with matched filter in m file
i dont know how to use any of window function to suppress the sidelobes of matched filter.i need help please.:idea:...
Digital Signal Processing :: 16 Jun 2009 19:35 :: Aya2002 :: Replies: 4 :: Views: 405
spectrum estimation
i am studying spectrum estimation and the book i have doesnt provide good examples.i would appreciate if someone direct me to material where i can find good and direct-simple examples, particurlary the periodogram method, blackman-turkey method, an...
Digital Signal Processing :: 07 Jun 2009 0:50 :: azaz104 :: Replies: 4 :: Views: 813
coherent and noncoherent ..
hi,whats the difference between coherent and noncoherent communications ?...
Digital communication :: 23 May 2009 22:00 :: raoshahid :: Replies: 7 :: Views: 498
ifft and fft in matlab
hi i want to ask whether there is any difference between taking n-point ifft and then fft for ofdm vs taking ifft and then n-point fft in matlab.the difference i get is the signal with n-point ifft and then fft has a spectrum which do not have good r...
Digital Signal Processing :: 07 May 2009 8:01 :: shamma :: Replies: 0 :: Views: 582
how to performe evm check by 802.11g signal ??
hi, all,does anybody can tell me how to generate 54 mbps ofdm (802.11g) signal in agilent signal generator and perform the evm check, alternatiely, you can show me some tutorial about this. thks....
RF, Microwave, Antennas and Optics :: 06 May 2009 15:34 :: yendori :: Replies: 5 :: Views: 423
matlab - power spectrum
hi,i am new to matlab. i would like to ask how can i plot the power spectrum like the one below (see file attached) from a wave file. i have tried something like below but it didnt turn out what i wanted.)any info/help is much appreciated.my apologie...
Digital Signal Processing :: 06 May 2009 8:43 :: asd09 :: Replies: 0 :: Views: 1365
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: 2946
noise analysis in cadence analog design environment
i want to do noise analysis of a circuit, how can i do it in cadence ade, references are appreciated ,help me. thanks in advance....
Analog Circuit Design :: 22 Apr 2009 12:02 :: arunkumar446 :: Replies: 4 :: Views: 960
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
please review the spectrum for my ofdm simulation
guys, ive finished my basic ofdm model and im currently working onthe synchronization & later the modelling of the power line transferfunction...but i just wanna check out with you guys first whether my spectrum iscorrect or not...this is my model (5...
Digital communication :: 03 Apr 2009 16:11 :: Communications_Engineer :: Replies: 2 :: Views: 555
audio spectrum - need help with the matlab code
um of an audio .wav file which was recorded by someone else.the .wav file has two tracks in it, so i just used one of them. the sampling rate is indicated in the file properties as 44 khz.i wrote the matlab code as below:sound=wavread(081029_08.wav);...
Electronic Elementary Questions :: 28 Mar 2009 21:19 :: FvM :: Replies: 3 :: Views: 345
explain zero padding in ofdm
wy implement the zero padding at the ends not in the centersee below, please helphttp://images.elektroda.net/82_1236162732_thumb.jpghttp://images.elektroda.net/56_1236162819_thumb.jpgthanks in advance...
Digital communication :: 27 Mar 2009 0:18 :: Aya2002 :: Replies: 28 :: Views: 1398
generate stimulus file with matlab for spectre simulation
hi, i am wondering if it is possible ?thanks,jf...
Analog IC Design & Layout :: 23 Mar 2009 21:59 :: JoannesPaulus :: Replies: 6 :: Views: 567
need for rf designer at hyderabad location
agreetings from vroute consulting services!!we are currently recruiting for one of our vital it client power wave technologies-hyderabadjob title: rf design engineereducation requires a bachelor’s/masters degree in electronics & communications engine...
RF, Microwave, Antennas and Optics :: 23 Mar 2009 14:01 :: VRoute :: Replies: 0 :: Views: 339
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: 2619
matlab fft
hi all,i am trying to do the fft on the digital output of sd modulator in matlab.can anyone tell me how to use the window function in matlab(hamming window) and how to plot the spectrum after this.i am new to matlab programing.thanks a lot...
Analog Circuit Design :: 07 Mar 2009 17:51 :: Aya2002 :: Replies: 2 :: Views: 948
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: 1742
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: 12883
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
characterizing current steering dac
hi to all to forum members, i have a cmos dac chip with 12bit and 6 bit current steering dac, and want to characterize it its inl dnl settling time with offset and gain error.i want to test the chip in school setting. only equipments i have in lab ...
Analog IC Design & Layout :: 21 Jan 2009 14:19 :: nschutten :: Replies: 1 :: Views: 354
problem in using spectrum in 2007a version
hi everybody ,i was using matlab to do some spectral analyses ( using spectrum command) on a time series with the old version last year, now with 2007 i am not able to produce the same spectrum plot with welch.specrtum. does anybody know what differ...
Digital Signal Processing :: 19 Jan 2009 8:21 :: xulfee :: Replies: 2 :: Views: 111
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
characterizing a current steering dac
hi to all to forum members, though i have already searched the forums and posted this in analog ic layout and design, i am posting it in this forum too.i have a cmos chip with 12bit and 6 bit current steering dac, and i want to characterize it its i...
Analog Circuit Design :: 03 Jan 2009 10:37 :: shantanugupta :: Replies: 0 :: Views: 306
phd in wireless communication looking for a job.
i have completed my phd this year in wireless communication engineering. my research areas consisted of error control coding (turbo and convolutional codes), modulation/demodulation (bpsk, 16-qam, 64-qam, 256-qam), ofdm, peak-to-average power ratio, ...
EDA Jobs, Promotions, Advertising :: 08 Oct 2008 14:25 :: luiceur :: Replies: 10 :: Views: 2145
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
spectral subtraction
hello to all members....i need help in ..speech enhancement using spectral subtraction methodmy question is ...(i) what are steps using to do spectral subtraction method ......(ii) if we use function for spectral subtraction ...
Digital Signal Processing :: 04 Aug 2008 21:19 :: ednan :: Replies: 3 :: Views: 216
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
voice record by matlab
hi,please help me to record voice by matlab in real time.regards...
Digital Signal Processing :: 19 Jun 2008 12:52 :: xulfee :: Replies: 2 :: Views: 1089
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