hi...i want to plot the STFT of a signal in matlab.....the signal is the return signal(echo)...from the rotating blades of a...

hi...i want to plot the STFT of a signal in matlab.....the signal is the return signal(echo)...from the rotating blades of a hovering helicopter....can...anyone...give me a method...to calculate STFT of this in matlab..i tried with the specgram..function....but..iam unable..to set it's parameters accordingly..so iam not getting the expected graph.....plz...help......

Hi, I am trying to implement the 1D DMUSIC algorithm described in: [1] Y. Li, J. Razavilar, and K. Liu, "A Super-Resolution...

Hi, I am trying to implement the 1D DMUSIC algorithm described in: [1] Y. Li, J. Razavilar, and K. Liu, "A Super-Resolution Parameter Estimation Algorithm for Multi- Dimensional NMR Spectroscopy," University of Maryland, College Park, MD 1995. I am not sure what is wrong with my MATLAB code. Does anyone know if there is an implementation available for download? My MATLAB code is: funct...

Hi!! i'm trying to programme in matlab a transmitter that uses two RSC , and an interleaver. I would like to know how to programm a RSC...

Hi!! i'm trying to programme in matlab a transmitter that uses two RSC , and an interleaver. I would like to know how to programm a RSC in matlab. The RSC encoder with constraint lenght K=3 and generator polynomial G=[7,5], and at the same time how obtain the trellis structure, nextstates and output of this encoder for a frame of bits. Maybe you can help me ...

Hi, I'm trying to write my first signal detection algorithm in Matlab... but it's been several years since I've done any DSP... so it's slow...

Hi, I'm trying to write my first signal detection algorithm in Matlab... but it's been several years since I've done any DSP... so it's slow going. if anyone has a little free-time, can you look at this and see if you can spot what I'm doing wrong? the data files can be acquired here: http://www.podoboq.com/podoboq/basic_detect.zip the two examples are simple (Class 1 - everything known...

I'm really new to filter design and need some major help on building a bandpass filter in matlab. I have the specs but i don't know where...

I'm really new to filter design and need some major help on building a bandpass filter in matlab. I have the specs but i don't know where to start. These are the specs: wp1 = 0.45*pi wp2 = 0.65*pi ws1 = 0.3*pi ws2 = 0.8*pi op = 0.01 os1 = 0.008 os2 = 0.05 I can't use the fir1 function. What is my first step? What other methods can i use to create a filter? Any help is appreciat...

I am working on AD9857 which copmrises an IQ modulator and in fact is a quadrature up convertor Using 14 bits I Q input data , I want to try out...

I am working on AD9857 which copmrises an IQ modulator and in fact is a quadrature up convertor Using 14 bits I Q input data , I want to try out various modulation schemes like AM, FSK,FM,BPSK,GMSK, QPSK and QAM. I`ve tried IQ modulation in different (analogue) shchemes with MATLAB using IQ in form of analog signals . I would like some help on simulation of the quad modlr block with MATLAB code...

Hi, for my diploma thesis I am studying different resampling techniques. Just now I wrote a Farrow resampler in Matlab. The structure of...

Hi, for my diploma thesis I am studying different resampling techniques. Just now I wrote a Farrow resampler in Matlab. The structure of the resampler is quite easy to implement, but I struggle with the polynomial coefficients. I tried to derive them from FIR filters, but although the filter approximations look good in time domain, the attenuation is quite low (20dB-40dB for an original fi...

Hi all, I have a vector of real numbers in Matlab. How do I compress them? Of course this has to be lossless, since I need to be able to...

Hi all, I have a vector of real numbers in Matlab. How do I compress them? Of course this has to be lossless, since I need to be able to recover them. The goal is to study the Shannon rate and entropy of these real numbers, so I decide to compress them and see how much compression ratio I can have. I don't need to write the result into compressed files, so those headers, etc. are ju...

Is there a way to invoke Matlab to run a single m-file? The purpose is to be able to "build" matlab output files from a make file. -- Randy...

Is there a way to invoke Matlab to run a single m-file? The purpose is to be able to "build" matlab output files from a make file. -- Randy Yates Sony Ericsson Mobile Communications Research Triangle Park, NC, USA randy.yates@sonyericsson.com, 919-472-1124

I am attempting to simulate a baseband OFDM communication system in MATLAB. I have the parallelized QAM symbols feeding into an IFFT, but this...

I am attempting to simulate a baseband OFDM communication system in MATLAB. I have the parallelized QAM symbols feeding into an IFFT, but this produces a vector of complex numbers. I found much information about taking the real and imaginary parts and modulating them with an In-phase and Quadrature signal, however this is not what I am trying to do. I am simulating OFDM in the base band, ...

Hi, I created an image in Matlab in the following way: I created 2 vectors that represent the image coordinates, and gave a value to...

Hi, I created an image in Matlab in the following way: I created 2 vectors that represent the image coordinates, and gave a value to each combination of the vectors. For example: a=[-0.4:0.02:0.4], b=a, image(y,x) is the value of a(y), b(x). Then I performed some operations that are like Fourier transform. I got new coordinates that were not equally spaced. So I made a grid, and interpolat...

Hi, I tried to record an audio signal by speaking into a microphone using the audiorecorder object in Matlab 6.5. But the output was absolutely...

Hi, I tried to record an audio signal by speaking into a microphone using the audiorecorder object in Matlab 6.5. But the output was absolutely illegible,and was noisy. I tried the same thing with Microsoft Sound recorder and the signal was clear. Do I need to do some conditioning before using the audiorecorder object's output????

hi, If I do an FFT of a signal in matlab, and extract the phase/angle, it is very noisy. It does not seem to reflect the true phase of...

hi, If I do an FFT of a signal in matlab, and extract the phase/angle, it is very noisy. It does not seem to reflect the true phase of the signal. Is there any way by which the actual phase can be extracted? thanks Ganesh

I am looking for Matlab codes for maximum likelihood estimate of the OFDM How to do that? And could anybody point me to some samples,...

I am looking for Matlab codes for maximum likelihood estimate of the OFDM How to do that? And could anybody point me to some samples, resources, examples, Matlab codes? Thanks a lot!

HELLO, EVERY ONE I WANT A MATLAB CODE , FOR "DESIGNING A IMPEDENCE MATCHING NETWORK FOR HIGH FREQUENCY 2MHZ TO 29.9 MHZ" & its allied code like...

HELLO, EVERY ONE I WANT A MATLAB CODE , FOR "DESIGNING A IMPEDENCE MATCHING NETWORK FOR HIGH FREQUENCY 2MHZ TO 29.9 MHZ" & its allied code like measuring L C R values & for smith chart help need badly urgent, thanks in advance with regards MAHESH

For starters, pardon my simplicity. That said, given - an array of sample data such that: data [ 8 ] = { 0., 0., 1., 0., 2., 0., 3., 0....

For starters, pardon my simplicity. That said, given - an array of sample data such that: data [ 8 ] = { 0., 0., 1., 0., 2., 0., 3., 0. }; If I ran an FFT on that via matlab - so now: a = [0+0i 1+0i 2+0i, 3+0i] b= fft( a ); The result: 6.000 -2.000 - 2.000i -2.000 -2.000 + 2.00i I'm going through a matlab couse and the individual who's teaching the course happens to ...

Hello, I would like to simulate the Doppler effects on OFDM. What is the simplest way to do this in Matlab? I want to simulate ONLY doppler,...

Hello, I would like to simulate the Doppler effects on OFDM. What is the simplest way to do this in Matlab? I want to simulate ONLY doppler, without any fading, therefore I dont want to use the rayleigh or ricean channel function built into matlab. Any help is greatly appreciated. Thanks Idan

Hi,every one. I read some matlab program (Voicebox - estnoisem.m)and inverse the line to be interloation logo. But I can not tell which kinds...

Hi,every one. I read some matlab program (Voicebox - estnoisem.m)and inverse the line to be interloation logo. But I can not tell which kinds kind of interloation it is. y = xi - (xi*xj)/(x-xj) * (yi-yj)/(xi-xj) Whick kinds of interpolation is it? Anyone can tell it? Thank you. The refered matlab line is as follows. % What is the priciple algo? Where it is described? m=dmh(i,2)+(qi*qj...

Hi, I'm starting to learn DSP (Matlab )and I have two questions about it, maybe someone can help me out? I'm trying to measure a frequency...

Hi, I'm starting to learn DSP (Matlab )and I have two questions about it, maybe someone can help me out? I'm trying to measure a frequency from an Audio Device and I'm using FFT to transform it from the time domain to the frequency domain. But I am doing a downsample before the FFT. But you can also do it after the FFT. Do you know what would be the most efficient (before or after)? And why?...

Hello I have two unknown speech sources s1 and s2 and one observation y: y[k]=c1*s1[k]+c2*s2[k]; where c1 and c2 are constants. Where...

Hello I have two unknown speech sources s1 and s2 and one observation y: y[k]=c1*s1[k]+c2*s2[k]; where c1 and c2 are constants. Where can I download a matlab algorithm that performs source separation for under-determined (under-complete) systems ? I need some matlab algorithm which is able to estimate s1 and s2 based on y. Thanks in advance...