43 Threads found on edaboard.com: Matlab Ofdm Qpsk
Can anybody tell me some nice tutorials for doing some GFSK,qpsk,ofdm modulation using matlab simulink?
Digital communication :: 15.05.2009 04:29 :: Somatou :: Replies: 0 :: Views: 7085
I don't know much about simulink, but at a glance I think it is because of "Input signal power" setting in AWGN model you used are set to constants.
When doing IFFT, there is multiplication with 1/N_FFT (inside IFFT function) which attenuate the signal amplitude. Because this attenuation, noise power can be too high for ofdm qpsk system.
Digital communication :: 15.09.2010 05:56 :: flyingdot :: Replies: 5 :: Views: 1887
I used an matlab example " syncCarrierFreqMSKSignalRecovery" to construct my model
and apply it for qpsk system,it works . but when i applied it to ofdm-qpsk , it doesn't work. Kindly advice
nBitPerSym = 64; % number of bits per (...)
Digital communication :: 10.10.2012 20:17 :: ReComm :: Replies: 0 :: Views: 725
Looking for how to modelize with matlab
ofdm with qpsk in a Gaussian channel.
THANK YOU VERY MUCH
Digital communication :: 18.06.2013 06:35 :: olivier75 :: Replies: 0 :: Views: 250
see Eric Cosby's matlab program (but it is QAM based).. its good.. i have added cyclic extension to it because he didn't do it.. but right now i don't have it.. the ifft/fft size selection is the requirement of the no. of carriers to be used.. u have to adjust the guard signal accordingly...
Digital communication :: 30.10.2006 04:31 :: Naveed Alam :: Replies: 16 :: Views: 4054
Degradation due to CFO = ICI + Phase rotation
degradation due to ICI is easy to evaluate. But Can someone provide me a theoretical bound on the phase rotations that can be tolerated by a QAM ??
i once made made a matlab program showing transmitted QAM symbols phases in phasor chart. on receiver, u can perform a calc
Digital communication :: 20.12.2006 06:09 :: Naveed Alam :: Replies: 4 :: Views: 1355
Can you send me a syntax command for qpsk mod. using matlab witah M=2. in order to calculate the BER for ofdm.
Digital communication :: 22.12.2007 11:48 :: Shwan :: Replies: 0 :: Views: 2020
i am writing code for equalizers in matlab ..can anyone help me
Digital communication :: 18.03.2008 17:55 :: pavithra452 :: Replies: 2 :: Views: 777
i am smulating ofdm in matlab
but in this mentioned code i am not able to draw graph between ci and ber(ie snr n bit error rate only one point is displayed .
plz have a look
where i went wrong plz correct
% Simulate effect of interfarence noise
% GI CE GI data GI data...(data 6
Digital Signal Processing :: 15.05.2008 04:31 :: dhruva :: Replies: 0 :: Views: 1507
Is there a problem? I'd start by running this in matlab and debugging the output. Starting with a working matlab script and making small changes has worked for me.
Digital communication :: 22.05.2008 23:12 :: RFDave :: Replies: 9 :: Views: 2497
can I get a matlab simulation code for ofdm implementing qpsk MODULATION..
ITS URGENT PLZ,,,,
Digital communication :: 30.05.2008 13:35 :: jazz12 :: Replies: 6 :: Views: 8854
by the way i dont generate these files all they are from matlab central
Digital communication :: 30.12.2008 05:31 :: Aya2002 :: Replies: 13 :: Views: 6400
I'm also intrested in turbocodes. Can somebody tell me - demo at is PCCC codes or SCCC?Author of this project is unreachable. I'm be very greatful for your consultation
Digital communication :: 12.10.2009 02:57 :: ratty_vb :: Replies: 4 :: Views: 2803
I am trying to implement Cofdm using Reed Solomon(255,239).The hindrance i face is that i use qpsk modulation,after reed solomon perform qpsk modulation i need my bits in the range of 0:3.But by performing reed SOLOmon encoding from 240th bit bit position to 255th bit position i have my bits in the range of 0:255.hence i can't use inbui
Digital communication :: 26.01.2010 07:03 :: pinkyvidya :: Replies: 5 :: Views: 1450
I have tried to simulate the performance of an ofdm system using qpsk a rate 1/2 convolutional code and a Viterbi decoder at the receiver. The problem I face now is after plotting the results, I come up with a funny graph that doesn't look anything like the theoretical result.
Here's an attachment of the matlab image i obtained. (...)
Digital Signal Processing :: 11.02.2010 05:01 :: ahamdiheme :: Replies: 3 :: Views: 3150
I have written this matlab code for a simple convolutionally coded ofdm system with qpsk and over a rayleigh fading channel. The problem I have however is I do not get the desired BER plot for the code.
Can someone please tell me where I have gone wrong in this code?
Digital Signal Processing :: 27.03.2010 21:31 :: ahamdiheme :: Replies: 3 :: Views: 1083
to add zeros, you have to add them as shown in this link:
it is message number 52
note that the output zero is at the center i mean the zero frequency is at the center.
check out it, it is very useful.
Digital communication :: 05.05.2010 06:11 :: Aya2002 :: Replies: 8 :: Views: 4432
It can certainly be done!!
every thing you write in the post can be accomplished in Simulink and even in matlab!!
I should stop being so excited!!!
Digital communication :: 15.05.2010 16:03 :: Communications_Engineer :: Replies: 4 :: Views: 1496
I want to make an individual block of ofdm in matlab can you please tell me what is the input and output of each block (please assume any values of parameters fore.g no of subcarrier=128, fft length=128 etc)
1 Serial to Parallel
2 QAM or qpsk Mapper
4 Insert Cyclic prefix
5 Parallel to Serial
6 Digital (...)
Digital communication :: 21.05.2010 07:26 :: mirfananis :: Replies: 3 :: Views: 852
Have you looked at bertool in matlab?
Digital communication :: 20.07.2010 19:08 :: RBB :: Replies: 2 :: Views: 1913
I want to simulate multiuser ofdm on fading channels in matlab, can nyone help me with some literature n guidelines to implement it..
This is what I undrstnd..
1>The 1st block of ofdm transmitter is a serial to parallel converter (s/p), where the high speed data stream is converted into variable data rate parallel streams (...)
Digital communication :: 31.07.2010 15:04 :: commworld :: Replies: 1 :: Views: 970
I Need matlab code for Performance analysis of Multi- tone CDMA using ofdm-qpsk......plz anyone help for me..................
Digital communication :: 07.09.2010 06:42 :: jai vijay :: Replies: 2 :: Views: 410
From several references, I read that SCO (Sampling Clock Offset) cause linearly increasing phase in frequency domain, such as stated in:
Simulation of Sampling Clock Offset | Comp.DSP |
I tried to create matlab cod
Digital communication :: 22.09.2010 01:22 :: flyingdot :: Replies: 0 :: Views: 2273
i m not completely familiar wid matlab therefore i m faceing the problem while getting BER curve for ofdm using qpsk modulation channel used is AWGN.........
plz plzzz help me out wat i m doing wrong ........... i hv to submitt that assignment .......thx in advance
packets =100; (...)
Digital communication :: 21.02.2011 17:30 :: junaidhussain12 :: Replies: 0 :: Views: 1151
im designing a matlab simulink model for ofdm-MIMO Wimax Phy layer and the probem i have nw faced is to set the cyclic prefix parameters in the selector block, and there's a model in matlab demo as well and also in the mathworks file exchange as well....and according to the model i found in mathworks by observing the mfile i could (...)
Digital communication :: 16.03.2011 13:21 :: dcschamika :: Replies: 2 :: Views: 1235
I try to implement the matlab code on BER for qpsk in ofdm over rayleigh channel (with n taps). However the result is a straight line. There must be something wrong in my code but I cannot figure it out what is wrong. Could you please help me to check it. I have to hand the work soon. Please please please help. Thank you very much.
Digital communication :: 19.09.2011 07:54 :: mazdaspring :: Replies: 2 :: Views: 2144
Hello to everyone, i need help to finish the last two comments in my matlab code.Thanks in advance for your time and assistance guys!!!
N = 1024; %FFT points
M = 2; %qpsk efficiency
CP = 1/16; %CP length
PCKS = 1; %Number of packets
for pak = 1:PCKS
Bit_Block = randint(1,N*M);
X = 1/(sqrt(2)) * ((2*Bit_Block(1
Digital communication :: 13.10.2011 09:42 :: salonikios :: Replies: 0 :: Views: 1417
Can anyone give me turbo coded ofdm code?
modulation(qpsk/8PSK/16PSK), turbo encoder, ifft, channel, fft, turbo decoder(log map), demodulation
with 256 subcarriers.
Thanks in advance....
Digital communication :: 26.12.2011 08:29 :: tulip123 :: Replies: 1 :: Views: 1278
Also Xilinx and Altera provide System Generator and DSP_Builder for matlab based solutions. You can try your algorithms based on using these simulink interface. Part of your m file designs can also be instantiated as HDL.
PLD, SPLD, GAL, CPLD, FPGA Design :: 09.01.2012 02:12 :: xtcx :: Replies: 4 :: Views: 740
Hi am doing a project of ofdm in matlab . i need the modulation schemes of qpsk,bpsk,qam. i know those modulation concepts but i dont know how to separate the given input into no.of 2 bits for qpsk and no.of 3 bits for qam. also i want the code or concept for plotting scatterplot for the given input combination. can anyone (...)
Digital communication :: 28.01.2012 23:01 :: krishnan17 :: Replies: 1 :: Views: 685
Hi My Frindes
I've designed transmitter - receiver ofdm in matlab.
String of bits 0 and 1 will transfer well, but I am faced with the problem of transmitting sound.:-(
I do not know, should be operational before the modulation using the instructions on how to do sound.:-(
Please Help Me
Sorry if the description is not flowing
Digital communication :: 14.07.2012 10:27 :: Alireza Nakhostin :: Replies: 6 :: Views: 1160
hi ..... i'am working on a matlab program to apply the sensing technique of energy detection on ofdm signal and i want to plot the relation between Pd and Pf ,,,, i made a vector for Pf and calculate the threshold for each value of Pf ,, but the problem with me is that the Pd is always 1 ,,,,, how can i get different pd for each value of
Digital communication :: 27.05.2013 08:22 :: bigstrik :: Replies: 2 :: Views: 650
i just wanted to start frm the main basic part for implementation of ofdm
i need a matlab code for it:shock:
Can any one PLEASE Help me with that please ... ! ?:?:
Digital communication :: 12.06.2013 05:20 :: vaah :: Replies: 1 :: Views: 1001
Hi all, I'm in dire need of the matlab code for BER of ofdm with MRC receiver over rayleigh fading channel for different modulation scheme such as BPSK, qpsk, M-QAM. If u have those, plz send to me: email@example.com. Thank u in advance.
Digital communication :: 21.06.2013 14:14 :: Ripon Roy :: Replies: 0 :: Views: 1522
I am going to complete my PhD before X'mas in UK. And I am currently looking for a job. I have skills with C/C++, matlab, Fortran. And my research areas are as follow:
Forward Error Correction (FEC), Error Control Coding, Turbo Codes, Convolutional Codes, Coded Modulation Systems, Modulations (BPSK, qpsk, QAM), ofdm, MIMO, WiMAX, WiFi, DVB, (...)
EDA Jobs :: 06.11.2007 11:40 :: cwjcwjcwj :: Replies: 25 :: Views: 7297
i'm modeling a communication system(MB-ofdm UWB) in matlab,but i have no advanced knowledge on the digital communication simulation , i need to figure out the changes of SNR due to system modification so could you help me to build a system like:
convolution encoder(rates :1/3, 1/2, 3/4, 5/8 )+puncturing---->
block interleaver---> (...)
Digital communication :: 28.04.2008 07:21 :: matido :: Replies: 4 :: Views: 1575
I had a question concerning making a simulation using matlab/Simulink.
I am looking to make some sort of modulation simulations using Simulink. I saw some links on the internet offering many.m files of qpsk,GFSK modulation.
I want to know if it's possible to make some digital modulation(GFSK,PSK,ofdm) using Simulink only i neces
Digital communication :: 15.05.2009 04:24 :: Somatou :: Replies: 1 :: Views: 2916
If you are using matlab 2009a, you may find a complete Simulink model for
IEEE? 802.16-2004 ofdm PHY Link, Including Space-Time
Digital communication :: 03.09.2009 23:18 :: ahmedseu :: Replies: 8 :: Views: 3273
Yes I downloaded the fft core on the FPGA , it was in a system consisting of a randomizer , convolutional encoder , RS encoder , qpsk mapping and FFT, the kit was connected to the PC through serial port.
Using a program to send data serially to the FPGA ( which is considered my transmitter ) then take the data serially back leaving the
Digital communication :: 27.10.2009 15:30 :: medra :: Replies: 4 :: Views: 1994
i got the code from matlab for ofdm, i have added noise to it but unable to get the BER..... can someone help me out
% A: Transmitter End
% 1. Generate random serial data with M symbols (RANDSRC will do this)
% 2. Perform modulation (4-PSK = qpsk for now)
% 3. Serial (...)
Digital communication :: 12.05.2010 00:54 :: abdullah gill :: Replies: 4 :: Views: 1026
Hi guys, Im trying to implement Analogue FDM on top of my single carrier modulation (eg: QAM and qpsk) or Multi carrier modulation (eg: ofdm). For an example, I have two different pair of I and Q channels, where first pair is upconverted at 2.2 GHz and the next pair at say 2.7 GHz and them MUX them together as in FDM.
I model them in (...)
Digital Signal Processing :: 26.04.2011 06:54 :: thavamaran :: Replies: 0 :: Views: 333
hi zorro.. thanks for replying.....
actually i am doing LS and MMSE estimation for ofdm in matlab ... i wanna to plot MSE vs SNR plot..., after adding CP and then IDFT , i have to pass signal thru a channel...
i have defined channel impulse response as h = (pdp*randn(5,1)) where pdp = exp(-n/5) for n = 0:4..... channel tap is 5...
Digital communication :: 27.02.2013 15:10 :: Romance42932 :: Replies: 3 :: Views: 276