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43 Threads found on Matlab Ofdm Qpsk
Can anybody tell me some nice tutorials for doing some GFSK,qpsk,ofdm modulation using matlab simulink? Thank You Soma
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. For fair
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 matlab Code ============ %Initilization %%%%%%%%%%%%%%%%%%%% nBitPerSym = 64; % number of bits per (...)
Hello, Looking for how to modelize with matlab ofdm with qpsk in a Gaussian channel. THANK YOU VERY MUCH
hi.. 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... Regrds Naveed
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
Dear All Can you send me a syntax command for qpsk mod. using matlab witah M=2. in order to calculate the BER for ofdm. thanks
i am writing code for equalizers in matlab ..can anyone help me
dear sir 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 and help where i went wrong plz correct thanks dhruva % Simulate effect of interfarence noise % % % GI CE GI data GI data...(data 6
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. Dave
Hi, can I get a matlab simulation code for ofdm implementing qpsk MODULATION.. ITS URGENT PLZ,,,,
by the way i dont generate these files all they are from matlab central
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
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
Hello, 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. (...)
Hello Everyone, 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? Thank you
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.
Hi there!! 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!!!
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) No Blocks 1 Serial to Parallel 2 QAM or qpsk Mapper 3 IFFT 4 Insert Cyclic prefix 5 Parallel to Serial 6 Digital (...)
Have you looked at bertool in matlab?
Hi all, 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 (...)
I Need matlab code for Performance analysis of Multi- tone CDMA using ofdm-qpsk......plz anyone help for me..................
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
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 clc; clear all rand('seed',0); randn('seed',0); packets =100; (...)
Hi All, 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 (...)
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. clear;
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!!! clc; 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
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....
I have implemented an algorithm in matlab.. Is it possible to load the matlab coding directly to FPGA? Else writing the coding in VHDL is the only way for this?
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 (...)
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
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
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 ... ! ?:?:
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: Thank u in advance.
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, (...)
hi 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---> (...)
Hi, 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
Hi, If you are using matlab 2009a, you may find a complete Simulink model for IEEE? 802.16-2004 ofdm PHY Link, Including Space-Time Best wishes Ahmed
Hi dear 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
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 (...)
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 (...)
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... after convolutio