**[Matlab Question] Converting H(s) to H(z) using derivative approximation?**Hi All,
I been having some issue with my lab work.
I'm supposed to do :
Transfer function H(s):
1
--------------------------------------------
s^4 + 2.613 s^3 + 3.414 s^2 + 2.613 s + 1
Convert H(s) into a digital IIR filterH(z)using the derivative approximation method
for the following three cases: T=0.05, T=0.25 and T=0.5.
The problem is, I unable to use Matlab to convert the transfer function from s to z, when s = (1 - z^-1) / T.
Matlab can only accept variable (z^-1)
Not sure why, and when i see the calculation part, the maths is so ...

**Matlab toolboxes for dvb-h**Hi all, iam happy to be here. I know this site is providing a lot of information for a students like me. Actually iam working on dvb-h simulation but before installing it i would like to know "particularly which matlab tool boxes" are needed by the dvb-h system. Iam wondering about the concerned tool boxes for dvb-h technology physical link layer simulation Waiting for the answer "vasu.kallempudi@gmail.com". Thank u all.
"sreenivasa kallempudi" <kallempudi.vasu@gmail.com> wrote in message <hqqq3h$2f7$1@fred.mathworks.com>...
> Hi all, iam happy t...

**DVB-H FEC decoder question ...**Hello,
I was looking at the DVB-H standard which has a serially concatenated
encoding with Reed Solomon code (RS(204,188, t=8) from RS(255,239, t=8)
) as the outer code and Convolution code (K=7) as the inner code. At
the receiver, I can think of at least four decoding options,
1. Viterbi followed by RS decoder.
2. MAP (BCJR) followed by RS decoder.
3. MAP followed by soft input RS decoder.
4. Having an iterative decoding with MAP and SISO RS as the component
codes.
I need to answer two questions before I select the decoder.
1. Complexity (DVB-H will be sitting in a handheld device which mak...

**Question on Symbol Interleaving in DVB-H**If you are familiar with DVB-T standard, here is an excerpt from DVB-T
standard on symbol interleaving:
The interleaved vector Y = (y0, y1, y2, ...yNmax-1) is defined by:
yH(q) = y'q for even symbols for q = 0, ..., Nmax-1
yq = y'H(q) for odd symbols for q = 0, ..., Nmax-1
where Nmax = 1 512 in the 2K mode and Nmax = 6 048 in the 8K mode.
Do the words "even" and "odd" refer to index locations or they are
referring to the values of symbols (even valued or odd valued)?
Regards,
Sastry
>If you are familiar with DVB-T standard, here is an excerpt from DVB-T
&g...

**Question on indepth Interleaving in DVB-H**accoding to the ETSI EN 300 744
"In the 2K mode, interleaved vectors shall be mapped onto four consecutiv
OFDM symbols. For even interleaved vectors these shall start with symbol
0,8,16,24, etc. and for odd interleaved vectors these shall start wit
symbols 4,12,20,28, etc. in every super-frame."
I have an question about symbol index of 2K mode & in-depth mode.
1. 4 consecutive OFDM symbols index: 0~67,0~67,0~67,0~67.
2. 4 consecutive OFDM symbols index: 0~271.
As you know, each index generate different ouput. which one is right?
...

**MMSE channel estimation in DVB-H ofdm**Hi all!! I am performing LS & MMSE channel estimation in an OFDM syste
with the DVB-H parameters, where the pilots are not equally spaced as th
case with WIMAX. I am facing a severe problem as the BER of both MMSE an
LS are identical. I am sure that the LS is correct and that the problem i
with MMSE. I've tried everything to make a difference between them. Th
only successful attempt was to increase the variance to 100 which i
absolutely wrong as it shouldn't exceed 1. Could the problem be with th
DVB-H parameters or is there something i'm probably performing incorrectly
Plea...

**Question on Symbol Interleaving in DVB-T/H**Hello!
I can not figure out the way, how data symbols are mapped onto carrier
after interleaving.
In the clause 4.3.4.2 symbol interleaving is defined with permutatio
function H(q). For even symbols yH(q) = y'q, q = 0..1512 (2K mode). Th
very first sentence of the clause says:
The purpose of the symbol interleaver is to map v bit words onto the 1 51
(2K mode) or 6 048 (8K mode) active carriers per OFDM symbol.
Later, it the Annex C there is a table of interleaving example. My poin
is that permutation finction itself does not profide information, require
to perform mapping of symbols on...

**A few questions on MPE-FEC and outer interleaver in DVB-H.**Hello, there
I am studying DVB-H and have these questions. Hope any of you could
throw some light on them.
1) If MPE-FEC is used, the receiver would need two RS decoders,
RS1(255,191,64) and RS2(204, 188). The result of RS1 is scrambled
and fed to RS2. Is my understanding right?
2) With Time Slicing. how is boundary of two adjacent bursts is treated
in the outer-interleaver? Will the data at the boundaries of two bursts get
mixed up? One receiver only takes one of the burst. how can it sort out
the interfering data from adjacent bursts?
I didn't find any clause in EN.301.192 indicating...

**A few questions on MPE-FEC and outer interleaver in DVB-H. #2**Hello, there
I am studying DVB-H and have these questions. Hope any of you could
throw some light on them.
1) If MPE-FEC is used, the receiver would need two RS decoders,
RS1(255,191,64) and RS2(204, 188). The result of RS1 is scrambled
and fed to RS2. Is my understanding right?
2) With Time Slicing. how is boundary of two adjacent bursts is treated
in the outer-interleaver? Will the data at the boundaries of two bursts get
mixed up? One receiver only takes one of the burst. how can it sort out
the interfering data from adjacent bursts?
I didn't find any clause in EN.301.192 indicating...

**Source code for DVB-T/H/S2, matlab and C**I am studying DVB-T/H/S2 standard, I would like to get source code
for the standard codec, both matlab and C. Who can help me ?
...

**How does matlab work in this issue ? a matlab principle question**Hello everyone
I have an ODE solver computing the temperature every month during a year
this script will do the job
for j=1:12
[t,T]= ode45(@monthly_solver,tspan,Tic,[],monthly_heat(j),h2(j),);
end
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 ...

**Matlab Architecture Question**I am interested in hearing ideas about the best ways to create "modules" in matlab?
The goal is to have one interface, where I can easily switch routines, and have different versions of the routine run.
For example, suppose I have a routine to recognize license plates. It needs to be initialized, and then on subsequent calls it needs to be run.
Later one, I want to swap the license plate recognition file, with another one, and have the new one take effect.
Is there an established 'best practice' for this in Matlab?
- Pat
[ I'm upgrading to Matlab 2009a, from 2005&...

**Matlab 7.0: where is "matlab.h"??**Hi,
I am currently trying to create a matlab standalone executeable. When
i tried to include "matlab.h" inside my code, i got compilation
saying that matlab.h is not found. May i know how i can access this
library?
Another question, can i convert a simulink model into a standalone
form(executable...) which can be run by user without matlab software?
Thanks in advance.
"Darren" <webtycoon777-shier@yahoo.com.sg> wrote in message
news:ef199f5.-1@webx.raydaftYaTP...
> Hi,
>
> I am currently trying to create a matlab standalone executeable. When
> i tried...

**Looking for DVB-H or DVB-T Software developer**We are looking for;
Software developer with experience in designing and developing DVB-H
or DVH-T software.
Location : Nederland, Eindhoven
Startdate : Asap
Duration 12 months
You can Phone me Marcel van Bezouw 0031 499 332066 or send a mail
m.bezouw@force.nl
The Force - IT Professionals BV
www.force.nl
...

**question in matlab**I have been plotted a 3D counter plot via the commands
[C,h]=contour3(w,p,green3,10);
t = clabel(C,h,'labelspacing',72)
get(t(1))
with run the comment in matlab recived this output:
Annotation = [ (1 by 1) hg.Annotation array]
BackgroundColor = none
Color = [0 0 0]
DisplayName =
EdgeColor = none
Editing = off
Extent = [0 0 0 0]
FontAngle = normal
FontName = Helvetica
FontSize = [10]
FontUnits = points
FontWeight = normal
HorizontalAlignment = center
LineStyle = -
LineWidth = [0.5]
Margin = [2]
Position = [-0.661507 0.649385 -0.01794]
Rotation = [290.824]
String = -0...

**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.
Thanks.
jim
In article
<4025405.1180395885...

**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
different?
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.
...

**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:
A[z]xB[z]
A[z]/B[z]
Z'(A[z]/B[z]) where Z'() is the inverse Z transform.
Thank you!
Edw
...

**MATLAB question**I've posted this on the MATLAB newsgroup, but that group is pretty noisy and
I know there are a lot of MATLAB users here, so here goes...
I'm looking for suggestions/code on doing the following. They generally get
more complex as the list goes on, numbers (1) and (4) are really the
startings point and most important to me.
1) Given a sequence of bytes, find all occurances of that sequence in a
binary file.
2) Given a sequence of bytes with possible wildcards (fixed wildcard length
of one byte), find all occurances of that sequence in a binary file.
3) Given a sequence of bytes ...

**ofdm question**Hello,
I tried to implement very simple OFDM channel. However i met an issue, i cannot solve myself. Could you please help me ?
This is the code:
data=randint(1,k,n);
modulated = pskmod(data);
OFDMmodulated=ifft(modulated);
receivedmodulated = fft(OFDMmodulated);
out = (receivedmodulated ~= modulated);
Why do I got every time receivedmodulated different from modulated, if k is greater than 8 ? I think this is something with fft/ifft usage.
thank you for your help
Robert
Hi,
I "improved ?" my programm a little bit:
function out = smallofdm
k=8
n=4
data=r...

**OFDM Question**I was wondering about demodulation. We woudl need phase coherence of both
the main carrier and the sub-carriers. I assume the main carrier can be
locked onto with a PLL but what about the sub-carriers? Do they use a pilot
sequency of some sort when multiply up to get the other frequencies?
Thanks
Tom
Bob the Builder said the following on 04/02/2006 04:35:
> I was wondering about demodulation. We woudl need phase coherence of both
> the main carrier and the sub-carriers. I assume the main carrier can be
> locked onto with a PLL but what about the sub-carriers? Do they use a pilot...

**question about matlab**i made a *.m file with de next code
q=1.6e-19;
Vd=-80;
Eo=8.85e-14;
E=11.9*Eo;
Na=logspace(10,19,20);
E_rup_1=20+5*log(Na/1e14)+Na/1e17;
E_rup_2=sqrt((-2*q*Na*Vd)/E)*1e-4;
semilogx(Na,E_rup_1,Na,E_rup_2)
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?
Thanks
If you're trying to graphically determine at which value(s) of Na the
two curves are equal, try ginput.
HELP GINPUT
Kyle
beporo wrote:
>
>
> i made a *.m file with de n...

**Questions about OFDM**Hi all,
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
long-delayed multipath-signals.
So, if I have:
.....-------+-------------------------------+-----------....
..... |GUARD| Nth Symbol |GUARD|
.....-------+-------------------------------+-----------....
.........-------+-------------------------------+-----------....
......... ...

**Matlab AM question**
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.
Thanks
Justin.
--
--------------------------------------------------------...