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Recent content by sib

  1. S

    How does spread spectrum work?

    Hi guys , i have problem very similar or say related to this discussion. I want to generate a signal whose frequency response looks like a rectangle in the frequency domain for example between (200kHz-250KHz) and is equal to zero for the rest of the spectrum. So my plan is 1) create a random...
  2. S

    i need help (Rayleigh Fading channe)l

    hey Qwme5 if you have managed to solve this, will you share the code? please
  3. S

    wireless comunication system simulation

    try to search these codes on "pudn". i am sure you can google it.
  4. S

    Why AWGN is additive?

    Yes i have the same question what happens when a IID RV whith unknown pdf is added to a zero mean gaussian noise.
  5. S

    signal detection in noise

    hi , i have a question . I have a vector of noise samples which i know are from a Gaussian distribution (say mean=0, var=1) and i have a vector of signal samples (IID RV with mean=0 and var=1, UNKNOWN PDF). Now my question is that when they are added up , what does the resulting pdf look like...
  6. S

    How do I calculate free space path loss of a cell site?

    Re: Free Space path loss I was wondering if you could help me . I am simulating a processed (carrying info) time domain signal which travels like 900m away to a receiver. I want the received signal to be effected by pathloss in time domain, how can i do that. its a very simple question , i am...
  7. S

    how to corrupt tx data by path loss value in matlab ?

    any idea on this , please share. i have got to know , how to corrupt my time domain signals with path loss
  8. S

    Path Loss in Matlab???

    hi i am not very clear on this is h the impulse response, if it is , shouldnt there be a convolution sign between h and x(t).
  9. S

    Path Loss in Matlab???

    Re: path loss matlab hi friend any idea on this . please share
  10. S

    Rectangular Power Spectral Density

    %SPECIAL NOISE FILTER clc; clear; close all; Fs=6000; Ts=1/Fs; t=[0:1:10000-1]; x= randn(1,length(t)); plot(t,x); title('Random Noise') xlabel('Time (sec)') ylabel('Amplitude') grid on nfft= 2^nextpow2(length(x)); fft_noise= fft(x,nfft)/length(x); f_axis= Fs* linspace(0,1,nfft); figure(2)...
  11. S

    Rectangular Power Spectral Density

    yes i am using matlab, was checking out the filter functions of matlab, i guess they wont help much in this case since they are FIR and irr types.
  12. S

    Rectangular Power Spectral Density

    thanks zorro, so you suggest i take the fft of a randn vector and then multiply it with filter=[0 0 0 0 0 1 1 1 1 0 0 0 0 0 0] sort of vector with 1s placed at the write place, am i right.
  13. S

    Rectangular Power Spectral Density

    Hello guys does can anyone give me an idea about the signal which will give us a power spectral density of the shape of a rectangle spanning 5MHz and centered around 10MHz. i want to construct such a signal, some say that it would be a sinc pulse that can give a rectangular PSD , any...
  14. S

    6 tap Rayleigh fading

    Hi friends, I have checkd other posts but didnt get an answer. I intend to build a frequency selective rayleigh fading channel for input data of 1000 blocks (each block containning 10 samples, and 10 samples also equal to the coherence interval of the channel) please guide me about it . i have...
  15. S

    Model that can approximate the time-varying channel

    Re: Time-varying channel Hi guys, can you help me , i intend to simulate a PSD estimator using the "basis expansion model" .please send me some matlab codes which tells how basis expansion model actually works i would be very grateful. thanks
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