PAPR

Started by raviteja in Matlab DSP14 years ago

Hello, Can anyone advice me to find the right way to calculate PAPR of multicarrier systems? I am currently working on PTS technique of OFDM....

Hello, Can anyone advice me to find the right way to calculate PAPR of multicarrier systems? I am currently working on PTS technique of OFDM. The peak average power ratio, is deifned by many in many ways. Can anyone post a nice algorithm to do this???Thank you in advance.


Plotting CCDF

Started by shammashahbaz in Matlab DSP13 years ago

i want to plot the CCDf of the ofdm signal i have calculated my peak to average power as meanSquareValue = Y4'*Y4/length(Y4); peakValue =...

i want to plot the CCDf of the ofdm signal i have calculated my peak to average power as meanSquareValue = Y4'*Y4/length(Y4); peakValue = max(Y4.*conj(Y4)); where Y4 is the fft of the signal ...how should i proceed Regards


scrambler and descrambler in MB-OFDM

Started by nhscor in Matlab DSP13 years ago

Hi, can anybody help me how to develop a code for the above subject? I know that scrambler is available in simulink blockset but can we extract...

Hi, can anybody help me how to develop a code for the above subject? I know that scrambler is available in simulink blockset but can we extract the code from there since I don't want to used simulink. please, really need your help, TQ. N'Na.


rayleigh fading.m

Started by anne naa in Matlab DSP19 years ago

hi, i would like to know if anyone have a rayleigh fading programming in Mfile format. i want to apply it on OFDM system and...

hi, i would like to know if anyone have a rayleigh fading programming in Mfile format. i want to apply it on OFDM system and plan to show the frequency offset due to the doppler shift. i really hope anyone can help me... thank you so much.. husn


normalized power spectral density

Started by edu_forme in Matlab DSP14 years ago

hi i am working on OFDM .....i can represent the overlapping subcariers using the following code x = -60:0.01:60 for i=2:1:6 ...

hi i am working on OFDM .....i can represent the overlapping subcariers using the following code x = -60:0.01:60 for i=2:1:6 % Y=(dn(i)*sinc(x-i)); Y1=Y+Y1; plot(x,Y,'b--'); hold on; end where dn is array of complex numbers that are QAM modulated.......i want to ask that multiplying the sinc function with a complex numbers resul...


IFFT for OFDM

Started by hat_zak2002 in Matlab DSP18 years ago

I write this code to get IFFT for y but only spectrum drawn not time domain siganal ploted: t = -5:0.001:5; y1 =...

I write this code to get IFFT for y but only spectrum drawn not time domain siganal ploted: t = -5:0.001:5; y1 = sin(pi*(t+1))./(pi*(t+1)); y2 = sin(pi*(t+2))./(pi*(t+2)); y3 = sin(pi*(t+3))./(pi*(t+3)); y0 = sin(pi*t)./(pi*t); y11= sin(pi*(t-1))./(pi*(t-1));


Help regarding MSE plot...

Started by "Arvindhan.K" in Matlab DSP16 years ago

Hello all, Can anyone help me out with finding out how to plot the mean square error estimate plot... I am working on Time synchronisation...

Hello all, Can anyone help me out with finding out how to plot the mean square error estimate plot... I am working on Time synchronisation of OFDM and wish to plot MSE for the time deviations... Thanking u, Arvindhan Kumar


the error of out of memory

Started by Tony Do in Matlab DSP17 years ago 3 replies

Hi : I am work on QAMand OFDM modulation project, and during the simulation I get the out of memory error after the message...

Hi : I am work on QAMand OFDM modulation project, and during the simulation I get the out of memory error after the message length large than 11, so I follow the help menu's instruction to expanded the memory into 4GB, but I still get the same error, so I need some


help for Accoustic Modem

Started by dspr...@gmail.com in Matlab DSP14 years ago

i am doing project on OFDM channel estimation,part of that is we have to transmit data from the soundcard(speaker) and on the reciever end i have...

i am doing project on OFDM channel estimation,part of that is we have to transmit data from the soundcard(speaker) and on the reciever end i have to collect the data through mic. i am having very difficulty in the synchronization of transmitter and reciever,therefore i need help of yours in the form of ideas and matlab codes so that i can transmit from one computer and recieve data from other one...


Powerline communication problem

Started by mohsen bahrami in Matlab DSP14 years ago

Hi friends, I have been investigating on the applicability of power line communications techniques. I want to simulate the plc system in ...

Hi friends, I have been investigating on the applicability of power line communications techniques. I want to simulate the plc system in MATLAB (m file).The simulation includes FSK and PSK and OFDM modulation and demodulation , error control coding , powerline channel and the noise over it. I have some problems with these simulations . I want to know if you have any MATLAB files (m fil...


OFDM orthogonality

Started by Diana Knight in Matlab DSP17 years ago 1 reply

Dear All; I want to plot orthogonality between sub-carriers with Matlab for five or more than five sub-carriers.If anyone have a...

Dear All; I want to plot orthogonality between sub-carriers with Matlab for five or more than five sub-carriers.If anyone have a code to plot orthogonality between sub-carriers Could you supply it to me? I look forward to your reply. Kind Regards.


power spectral density

Started by Mohammed Ali in Matlab DSP13 years ago

? Please i need? help in PSD to compare between different methods of PAPR. When apply the following code not given the same plot as in your...

? Please i need? help in PSD to compare between different methods of PAPR. When apply the following code not given the same plot as in your paper . ? My Matlab code ? N = 256;????? % length of OFDM IFFT M = 16;?????? % number of QAM constellation BW=10;??????????? % in MHz txData= randint(N,1,M); txDataMod? = qammod(txData,M); ? txDataZpadIfft = sqrt(N)*ifft(txDataMod ,N); ...


About Pilot tones

Started by Bavithi in Matlab DSP15 years ago

Hi All, I have a basic doubt about pilot tones. I am working with OFDM systems and I am trying to implement pilot tones for a 64 subcarrier...

Hi All, I have a basic doubt about pilot tones. I am working with OFDM systems and I am trying to implement pilot tones for a 64 subcarrier system. I set aside 4 tones for pilot data in frequency domain. However, according to a fwe books I've read, I learn that pilot tones , which are used for channel estimation ,change their position according to some pattern (discussed in the literatur...


need help about rayleigh fading

Started by "n.mie_arul" in Matlab DSP14 years ago 3 replies

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 ...


Zero padding problem in Simulink

Started by vcteo in Matlab DSP16 years ago

I have some questions regarding implementing OFDM in Simulink... I'm using BPSK, thus my output after BPSK would be a complex number. ...

I have some questions regarding implementing OFDM in Simulink... I'm using BPSK, thus my output after BPSK would be a complex number. I've splited up the real (16 samples) and imag (16 samples) numbers into 2 matrices. I plan to use IFFT with 64 samples. Except for the DC (sample 1), Nyquist center frequency (sample 32) and the real (13~31) and i


Sampling frequency offset correction & estimation Speth et al.

Started by bobo...@gmx.de in Matlab DSP11 years ago

Hello everyone, I'm having troubles with SFO estimation and its correction on Speth algorithm, since I don't get correct estimated values...

Hello everyone, I'm having troubles with SFO estimation and its correction on Speth algorithm, since I don't get correct estimated values neither in AWGN nor in ideal case. Basically, I add SFO to OFDM signal through interpolation in time domain. Then trying to estimate with following code: temp_pilots_rx=[pos_pilot_symbols_rx_neg; 0; pos_pilot_symbols_rx_pos;]; % separate negative & positi...


How to implement a PLL in MATLAB?

Started by hoiyeebab in Matlab DSP13 years ago

Is anyone know how to implement a PLL in an OFDM system using MATLAB?

Is anyone know how to implement a PLL in an OFDM system using MATLAB?


BER for 4QAM with AWGN Channel

Started by loc truong in Matlab DSP14 years ago 4 replies

hi everyone, I am trying to simulate a OFDM system with AWGN channel, 4QAM symbol in matlab. Theoritically, the curve for BER should be the...

hi everyone, I am trying to simulate a OFDM system with AWGN channel, 4QAM symbol in matlab. Theoritically, the curve for BER should be the same as for BPSK BER = Q(sqrt(2*Eb/No)); But I have a problem: When I normalized the symbols 1/sqrt(2)(1+j) (For example), that doesn't work. But when I leave out the factor 1/sqrt(r), it works perfectly. Anybody knows the answer? Please help. Th...


Need advice on sample rate conversion

Started by sys73962 in Matlab DSP13 years ago

I am creating a pseudo WiMAX waveform that can be played as I/Q samples out of an arb. I've completed the framing structure and populated the...

I am creating a pseudo WiMAX waveform that can be played as I/Q samples out of an arb. I've completed the framing structure and populated the carriers with random data. I need some advice on the best way to convert a OFDM signal to the arb's faster sample rate. I have access to the Communications toolbox DSP toolbox RF toolbox I am not familiar with Simulink, so please let's j...


Re: PAPR Reduction or Pre-distortion Techniques for OFDM

Started by amit...@ittiam.com in Matlab DSP15 years ago 2 replies

I have gone thtough some literature on PAPR reduction techniques. Boardly i= t can be divided as: 1. Signal Processing 2. Coding (Random...

I have gone thtough some literature on PAPR reduction techniques. Boardly i= t can be divided as: 1. Signal Processing 2. Coding (Random encoding, Golay Sequence, Cyclic Code) 3. Random Scrambling (Costellation Design, Selective Mapping, Partial Trans= mit sequence) Of which I am mostly interested in the first one because that do not need a= ny change in the inner transmitter functions ...