DVB-H OFDM matlab Question
I am working on simulating DVB-H 4k mode according to ETSI standard
According to the standard i am populating 3024 data carriers with QPSK.
am trying to validate the simulation by measuring the BER before Vit&R
decoding and comparing to standard Eb/No qpsk curves. The problem is tha
I am using the MATLAB AWGN function with SNR from 0to12dB and the fla
'measured'. I would like to know how to translate this to Eb/No so I ca
compare to the known QPSK theoretical curves, or if there is a better wa
to validate the simulation.
...com.sys and usbser.sys question
I got a question, for those knowing more about that matter than myself,
which shouldn't be hard ;-)
Temporarily having 2 phone lines at my disposal, I wanted to put my old
modem back to use as a phone number dialer, using the BonusPack PIM
But I had quite some trouble to get my COM1 port to work at all with any
It finally turned out, that COM.SYS has to be loaded before USBSER.SYS,
since otherwise USBSER.SYS is hijacking COM1 unnoticed. Now, in the order
shown below, it assigns itself to COM6 (if not remed out), but COM1 still
d...How does matlab work in this issue ? a matlab principle question
I have an ODE solver computing the temperature every month during a year
this script will do the job
where Tic is the intial temperature and J loops represents the months
Now the question is about matlab principle and how does it work with the initial condition? i mean
as the last temperature of the 1st month is the begining temperture of the 2nd month and the last temp. of the 2nd month is the begining temp. of the 3rd month and so on. Do i need to write a command to do ...questions about OFDM
I've been following the OFDM demodulation discussions on this NG for
some time. However, there are a couple of things that I don't quite
Most of the posts I've seen have been regarding baseband demodulation
of OFDM signals. My question is, how do you demodulate when the
signal isn't at baseband, i.e. its still on an RF carrier?.
Can you demodulate the signal directly or would you have to shift
down in frequency before you could demodulate?.
For arguments sake, lets say we have an 32 carrier OFDM signal with
10Khz tone separation centered on 1Mhz and that signal has been
sampled at say, 10M.
Could I just shift the carrier frequency down by 1Mhz (plus half the
bandwidth of the signal), filter, resample and apply a 32 point FFT
Next question is, assuming I end up shifting the carrier down in
frequency, what would be the easiest way to do this?. Is there a way
to just shift the carrier without mixing it with another signal?
Thanks in advance
It may be possible to demodulate without basebanding but it would
require an unweildy FFT size. In any case it's just not practical.
Typically, the first step is to baseband which is a shift in frequency
sometimes combined with a hilbert transform to create an analytic
signal. One typical wants to shift the center frequency to zero.
A shift in the frequency / time domain is equal to a multiplication by
a complex exponential in the reciprocal domain. By multiplying the ...questions on matlab
My name is Tusajigwe, student from Brighton University taking MSC in
Digital Electronics and Communication. Now am doing a research on
Wireless Communication which concern with email alert to GSM users on
their cell pohones,what i want from this project is to make GSM users
to receive email alert when they have got new mail and this service
will be offered by GSM operator
ways of achieving
1)To establish link between ISP and SMS centre,because e-mail alert
will be in the form of text message and ISP is the one who knows if
someone has mail after see it ISP forward to SMS centre by us...Matlab how to question?
I am a student of engineer, and I am in a course that's call numeric calculus.
I have to do a shore an I'm stuck in a question. I have to minimize the error of an aproximation and make a matlab program that do that, just receiving a few points in two dimensions.
More clearly, I will receive a table with 20 points, like (x1,y1)(x2,y2)...(x20,y20), and with the method "ortogonal square minimus" (Something like that) I have to minimize the error of an aproximate polynomial. Some clues?
I would apreciate a lot any help anyone may do.
<4025405.1180395885...question in matlab
I have been plotted a 3D counter plot via the commands
t = clabel(C,h,'labelspacing',72)
with run the comment in matlab recived this output:
Annotation = [ (1 by 1) hg.Annotation array]
BackgroundColor = none
Color = [0 0 0]
EdgeColor = none
Editing = off
Extent = [0 0 0 0]
FontAngle = normal
FontName = Helvetica
FontSize = 
FontUnits = points
FontWeight = normal
HorizontalAlignment = center
LineStyle = -
LineWidth = [0.5]
Margin = 
Position = [-0.661507 0.649385 -0.01794]
Rotation = [290.824]
String = -0...matlab OFDM
Anyone has a OFDM in matlab .m files that could share with me?
I need to make some simulations on it and I have been finding lot o
problems in building a OFDM in matlab.
If someone could send it to me at email@example.com would be very
If someone has some book that could send me it also would be great.
Juca P. Souza
"Juca P. Souza" <firstname.lastname@example.org> wrote in message
> Hi There,
> Anyone has a OFDM in matlab .m files that could share with me?
> I need to make some simulations on it and I have been finding lot o
> problems in building a OFDM in matlab.
> If someone could send it to me at email@example.com would be very
> If someone has some book that could send me it also would be great.
> Juca P. Souza
Better yet... keep on building it yourself and post your questions and
problems here when you get stuck. You will learn a lot more this way.
...Questions over questions
I have a problem with my ISP! He kills my php script, if they were executed
over 30 seconds.
Can I use some trick to fake a little bit? That I can execute the script
Sven Dzepina wrote:
> Hello people,
> I have a problem with my ISP! He kills my php script, if they were executed
> over 30 seconds.
> Can I use some trick to fake a little bit? That I can execute the script
If your ISP doesn't run your script in safe mode, which it most likely
does, then you can set_time_limit(0); for unli...Matlab AM question
I am trying to implement a very simple version of an AM receiver in
Matlab but as I am new to this software package I seem to be getting
nowhere. So far I have searched the web and Matlab books for examples that
would help me to understand how this could be done without much success. I
now this is probably a silly thing to ask but could anyone guide me in the
right direction, i.e. links to websites, etc. or maybe provide me with a
hints. Anything would help really.
Your help is much appreciated.
"There's no point in being grown up if you can't be childish sometimes"
Fourth Doctor Who(Tom Baker)
Doctor Who Web Site www.doctorwho.hopto.org
"Justin Champion" <firstname.lastname@example.org> wrote in
> Dear all,
> I am trying to implement a very simple version of an AM
> receiver in
> Matlab but as I am new to this software package I seem to be getting
> nowhere. So far I have searched the web and Matlab books for examples
> that would help me to understand how this could be done without much
> success. I now this is probably a silly thing to ask but could anyone
> guide me in the right direction, i.e. links to websites, etc. or maybe
> provide me with a hints. Anything would help really.
> Your help is much appreciated.
&g...Few matlab questions
I have this questions for you. I hope some one can help me.
So I have a background image and I want to insert another image over it. A ball for example. But this ball get on top of the background and it streches to full screan.
1) How to make matlab plot a picture in its original size. I don`l want to be stretched.
2) My ball picture is a PNG file so i need not to show the transparent pixels. I used:
A = imread('ball.png','BackgroundColor','none');
but it isn`t working..
3) Can I load an animation or sound in the plot ...Some questions on matlab
Hi all, i am using matlab and encountered some problems. Kindly advice.
1)i am using newff function to create a neural network.After which,
someone advised me to set some of the parameters ,for example,
net.performFcn,net.trainParam.goal and many more. But i tried using my
matlab help and search for function to llok up for what these
do. However, i can't find any help on these parameters. Where can i
2)i intend to use the train function to train my network. In the train
function, according to the help file,we can also give T(network
as input. Can someone ki...question about matlab
i made a *.m file with de next code
I have ploted in logaritimic scale the functions, "E_rup_1" and
"E_rup_2" depending off Na,
on the plot and for a Na value, the 2 functions are equal.
How can i get the Na value?
If you're trying to graphically determine at which value(s) of Na the
two curves are equal, try ginput.
> i made a *.m file with de n...Questions about OFDM
I'm studying OFDM from documents available from Internet for free
and I have some doubts.
I understand that guard interval was added to solve problems with
multipath-signal delayed. So, because symbol duration in OFDM is
long, a little fraction of it can guarantee immunity against
So, if I have:
..... |GUARD| Nth Symbol |GUARD|
......... ...question about Matlab
I have 2 signals with sampling freq 50Hz and different duration.
a[n] = [a1 a2 a3 .... an]
b[n] = [b1 b2 b3 ............................... bn]
In matlab, how to find:
Z'(A[z]/B[z]) where Z'() is the inverse Z transform.
...Few Questions About MATLAB
Hi, was wondering if anyone could help. there are a few things i need
to know about some Matlab functions
1- if Pwelch and fft are used to find the Spectral Power Density. but
how come when u apply them to the same data, the graphs look
2- when using the sendmail function, how does Matlab make the
connection and send the data? ive looked at the code that Matlab uses
for "sendmail" but its very difficult to understand.
if anyone could help, i would be really greatful . thanks.
...A simple question in matlab
I want to write:
f=sum(sin(m*Pi*z/L), m = 0 .. 100)
and plot the f function with the z interval [0,10].
But I couldn't do it. Can anyone help me?
spmathsp <email@example.com> wrote in message
> Hi everybody,
> I want to write:
> f=sum(sin(m*Pi*z/L), m = 0 .. 100)
> and plot the f function with the z interval [0,10].
> But I couldn't do it. Can anyone help me?
1. Start by defining z as a vector. Use linspace.
2. Evaluate the...Matlab question #3
In Matlab, I have this function:
y = 20 * (x.^2).* ((1-x).^4) .* cos (12 * pi * x);
When I try to see the result of y(0.5) on the m-file, the system
generates a synatx error:
??? Error using ==> run
Attempted to access y(0.5); index must be a positive integer or
The question is that how can I access this value as I need to sample
this function into 1000 intervals, and use these samples for discrete
My program is:
x = [0:0.001:1];
y = 20 * (x.^2).* ((1-x).^4) .* cos (12 * pi * x);
Array(i) = y(i/1000);
e...Blocks question / Matlab
I want to generate a series of numbers 0-360 (a series of degrees) to
input the number to a block.
Is there a Matlab block that can do this?
Efthimios <firstname.lastname@example.org> wrote in message <email@example.com>...
> I want to generate a series of numbers 0-360 (a series of degrees) to
> input the number to a block.
> Is there a Matlab block that can do this?
matlab doesn't have 'blocks'. the code to do this looks like 1:360
if you are talking about simulink there are many ways t...embedded matlab question.
I'm a long time matlab user who is new to embedded matlab. I'm trying to learn the basics but I keep getting an error like this. Could someone please tell me where I'm going wrong?
Error: Nonconstant expression or empty matrix. A_temp = zeros(n);
Error: Could not determine the size of this expression. A_temp = A(1:n,1:n);
Error: Nonconstant expression or empty matrix. A_inv = zeros(n);
function A_inv = inverse(A, n) %#eml
%this function computes the inverse of A(1:n,1:n)
% the maximum size of A is 500 x 500;
A_temp = zeros(n);
A_temp = A(1:n,1:n);
A_inv = zero...question about matlab #2
i want to ask u how can we built dec2bin fuction in matlab plz
refer me a site or answer
In article <5tgumc6d0ds5@legacy>, firstname.lastname@example.org (ammar
> i want to ask u how can we built dec2bin fuction in matlab plz
> refer me a site or answer
If you like, you may use my home-grown version. It accepts only finite,
non-negative integers and has only been tested on my 4a version of matlab.
function str = dec2bin(d)
if (floor(d) ~= d) | (d < 0) | ~finite(d)
error('arg must be a finite, nonnegative integer')
en...Matlab question #9
Hello. I am quite a beginner in matlab.
I am having trouble doing the following, and was wondering if anyone could help me.
I want to create a vector where the entries alternate between 0s and a RANDOM entry from the set (2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5). I need every entry from that set to be used exactly once.
"Jon N" <email@example.com> wrote in message <firstname.lastname@example.org>...
> Hello. I am quite a beginner in matlab.
> I am having trouble doing the following, and was wondering if anyone could help me.
> I want to create a vector where the entries alternate between 0s and a RANDOM entry from the set (2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5). I need every entry from that set to be used exactly once.
one of the many solutions
% r = 0 3 0 4 0 5 0 2 0 % <- one random instance...
On Jul 13, 7:48=A0am, "Jon N" <random_...@msn.com> wrote:
> Hello. =A0I am quite a beginner in matlab.
> I am having trouble doing the following, and was wondering if anyone coul=
d help me.
> I want to create a vector where the entries alternate between 0s and a RA=
NDOM entry from the set (2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5). =A0I need every =
entry from that set to be used exactly once.
Hey, please don't double...OFDM demodulation question
Here's my question:
In doing the OFDM (like DVB-T) demodulation, why do people just talk
carrier frequency sync and carrier phase noise but not carrier phase
Does that mean OFDM is not coherently demodulated?
Thank you for your help!
Harry said the following on 04/04/2006 00:31:
> Here's my question:
> In doing the OFDM (like DVB-T) demodulation, why do people just talk
> carrier frequency sync and carrier phase noise but not carrier phase
Can you give an example of when "people don't talk about carrier phase...A Matlab question on Patch
I am working on a Matlab GUI. I was able to load a patch (a
human brain) into one axes of my figure. Now I would like
to rotate the patch in various direction, change its
transparency, color etc.
I will be very grateful if you kindly tell me how to do it
or suggest me any books or tutorials which deals with patch
Thank you very much for your help.
In article <email@example.com>,
Shariful <firstname.lastname@example.org> wrote:
>I am working on a Matlab GUI. I was able to load a patch (a
>human brain) into one axes of my figure....