Hi everyone. I just want to plot the QPSK baseband spectrum from the output data of the QPSK simulink block. However the output of this...

Hi everyone. I just want to plot the QPSK baseband spectrum from the output data of the QPSK simulink block. However the output of this block are the symbol coordenates in the signal space and when I use "spectrum scope" i don't get the theorical spectrum for the qpsk (the sinc function..). How can I do it? Can I use the qpsk block? thanks in advance!

Hi everybody, I'm working on a Simulink QPSK modem for a Altera Stratix platform and I'm a bit lost. Does anybody have a model in simulink of a...

Hi everybody, I'm working on a Simulink QPSK modem for a Altera Stratix platform and I'm a bit lost. Does anybody have a model in simulink of a QPSK modem that can help me developing mines? If anybody could send me a model I will be really thanked. Bye!

Dear all, I've a problem demodulating in QPSK. My transmitter is a vector signal analyzer (VSG) and a labVIEW programme is used to capture...

Dear all, I've a problem demodulating in QPSK. My transmitter is a vector signal analyzer (VSG) and a labVIEW programme is used to capture the data. Matlab is used to despread the data using PN sequence of 1024 bits, after which the data is being demodulated. Below is a portion of the code using BPSK, % Read off Gain Factor and offset Gain_factor = fread(fid, 1, 'double'); Offset = frea...

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...

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. [QUOTE]clear; clc; N=64; % FFT size Nsd = 48; % Number of ...

Good morning, does anybody has an idea, how to measure the baudrate also known as the symbolrate of a QPSK signal - I have a Real-Array and...

Good morning, does anybody has an idea, how to measure the baudrate also known as the symbolrate of a QPSK signal - I have a Real-Array and an Imag-Array of data-streams? 1. How should I proceed? 2. Is finding zero-crossing from the signal a good approach? 3. Does anybody has source-code concerning this . Thanx a lot in advance for your support. Best regards. Bochao

Hi all, i trying to implement the QPSK mod and Demod in matlab. I'm not able to get the Symbol Sync for QPS based on Early and Late...

Hi all, i trying to implement the QPSK mod and Demod in matlab. I'm not able to get the Symbol Sync for QPS based on Early and Late Gate Integrators. Can one help me regarding this or forward me some material that can help me implement this in matlab. Thanks, Abhishek Abhishek Agarwal

Hi all!! I implemented in Matlab some different ZF equalizations, but I should change the input signal froma random [+1/-1] signal to a QPSK...

Hi all!! I implemented in Matlab some different ZF equalizations, but I should change the input signal froma random [+1/-1] signal to a QPSK or BPSK signal (choosing number of samples, oversampling and so on..), but I have no idea of how doing it. Could anyone give me some advices or some code-examples? Thank you all in advance, Ella PS:here there

Hi All, I am new member of this group and I need a method to compute the soft decisions using SOVA for QPSK symbols. I am using a rate...

Hi All, I am new member of this group and I need a method to compute the soft decisions using SOVA for QPSK symbols. I am using a rate 1/2 systematic convolutional  code with following trellis structure:   trellis = poly2trellis ( 3, [5 7], 5 );   Please suggest me

Can some one get me a source code as to how i go about simulating qpsk symbols? The constraints are: symbol rate - 1 /sec and...

Can some one get me a source code as to how i go about simulating qpsk symbols? The constraints are: symbol rate - 1 /sec and chip rate is 128sec.

hi all, Below is the QPSK i have done to calculate the BER. However, the dectection part is wrong. Can anyone advise what is...

hi all, Below is the QPSK i have done to calculate the BER. However, the dectection part is wrong. Can anyone advise what is the correct syntax. Appreciate the help greatly. Thanks %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

I need some help in creating BPSK, QPSK, DPSK modulated signals. If someone know the modem design by using the signals above, it...

I need some help in creating BPSK, QPSK, DPSK modulated signals. If someone know the modem design by using the signals above, it will be great help Thanks

Hi, I want to simulate a QPSK transmission through a multipath channel. I see that some people use 1 sample per symbol while...

Hi, I want to simulate a QPSK transmission through a multipath channel. I see that some people use 1 sample per symbol while others use 8 or 16. Could someone give me some hints about the advantages and disadvantages of each option? I'm thinking about... - whether

Hi, I am having a weird problem with a passband QPSK simulation I am working on. I just need the modulated output for further...

Hi, I am having a weird problem with a passband QPSK simulation I am working on. I just need the modulated output for further pprocessing and dont want the demodulation in my simulation. When I just use the M-PSK modulator the transmitted output is like a square wave. When ther

Hi, I have a few doubts regarding the calculation of bandwidth for various Analog/Digital modulation, please correct me if I have gone...

Hi, I have a few doubts regarding the calculation of bandwidth for various Analog/Digital modulation, please correct me if I have gone wrong Fm=Frequency of message signal. deltaF=Freq.deviation SR= Symbol Rate AM = 2 * Fm FM = 2 * deltaF + Fm 2FSK = 2 * deltaF + SR 4FSK = 2 * deltaF + SR BPSK = SR QPSK = SR Will the Root Cosine Filter at the transmitter side will effect t...

Hi, I am trying to advance my knowledge on a QPSK communication system. I found a simulink simulation that describes a communication...

Hi, I am trying to advance my knowledge on a QPSK communication system. I found a simulink simulation that describes a communication system. I tried to contact the author, but I am assuming he is busy, since he didn't reply to me. So, I would appreiciate if someone can answer my question. In case, if you would want to look at the simulink files, it is located at: http://www.mathworks.de/m...

Hi all! Basically my project is a bit generator+spreader+modulator --> demodulator+despreader. A 4 bit sequence is converted to a 32 chip...

Hi all! Basically my project is a bit generator+spreader+modulator --> demodulator+despreader. A 4 bit sequence is converted to a 32 chip sequence by the spreader. If I use a QPSK and without AWGN channel, I get 0 BER before and after the despreader. However when I use the MSK (or OQPSK) and I add the delay beacuse of the modulation (2 bits for OQPSK and the traceback length for the MS

hi; i have simulated a general ofdm system but i am not having correct results. can any one rectify problems in this code. have i used correct...

hi; i have simulated a general ofdm system but i am not having correct results. can any one rectify problems in this code. have i used correct formulas in this code? i mean does RAYLEIGHCHAN command hold for it? do i need to equalize the receiver signal? if so then how and at what stage? and have i used right command for theoritical BER of OFDM in Rayleigh channel? % Script for computing the B...

hi i have written matlab code for rayleigh fading using BPSK and QPSK i generate a rayleigh distribution by generating two identiaccly...

hi i have written matlab code for rayleigh fading using BPSK and QPSK i generate a rayleigh distribution by generating two identiaccly independently generated gaussian vectors and than i take a absolute value of it that gives me a rayleigh distribution..than i multiply this value with transmitted signal that gives me a rayleigh fading signal..that means i multiply amplitude of rayleigh envelop ...

hi everyone..now i started my last year project about Rayleigh Fading using OFDM system..i have a problem when using QPSK modulation..Below is...

hi everyone..now i started my last year project about Rayleigh Fading using OFDM system..i have a problem when using QPSK modulation..Below is a my coding..anybody know how to solve this prob?? %******************* Preparation Part***************************** para=128; % Number of parallel channel to transmit fftlen=128; % FFT length noc=128; % Number of carrier ...

U can write ur own APP decoder for that using BICM concept. BR, -SaiRamesh. --- f...@tee.gr wrote: > Dear colleagues, > > is there...

U can write ur own APP decoder for that using BICM concept. BR, -SaiRamesh. --- f...@tee.gr wrote: > Dear colleagues, > > is there anybody that has connected a LLR > demodulator Simulink block (i.e. QAM, QPSK) with an > APP Decoder one? I need that to make turbo-coded > modulation simulations with Simulink either SCCC > turbo coder or PCCC ones. Simulink Help and Demos > also mainta