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Recent content by Communications_Engineer

  1. C

    What is variance and why is it important in digital communication?

    o if the signal is a zero mean RP then we can take the variance as its power.
  2. C

    need help in converting a 1000 by 6 dimension into a 1 row vector for qpsk

    use, reshape(data,1,[]) where data variable contains the 15786*6 dimension data
  3. C

    to create GUI for Simulink parameter estimation block diagram

    here you go Search Results: guide type:"video" - File Exchange - MATLAB Central
  4. C

    Thesis topic for Master in signal processing

    spectrum estimation
  5. C

    why bandpass is designed in symmetrical?

    it is not a rule that bandpass filter should be symmetric, examples are given by FvM. Usually FIR filters are designed to be symmetrical so that they have a linear phase response.
  6. C

    matlab awgn psd generation

    if your transmission is complex i.e. real and quadrature, the complex white noise is used to add noise to both the component parts
  7. C

    matlab awgn psd generation

    sqrt(-1), to generate complex white noise
  8. C

    matlab awgn psd generation

    1. convert -140dB into linear scale. Say it is NoiPow 2. let Sig is a vector containing your other signals 3. In Matlab type Noise = [randn(1,length(Sig))+j*randn(1,length(Sig))]/sqrt(2); NoisySignal = Sig + Noise*sqrt(NoiPow) I hope I have not made a mistake here. by the way, a noise of...
  9. C

    frequency selective channels

    by the way, a frequency selective channel is like a frequency selective filter.
  10. C

    frequency selective channels

    I think so. There is a capacitance in electric cables such that they distort signals at high frequencies. So yeah I think they are frequency selective.
  11. C

    Adjusting MATLAB precision

    I think you can do some changes from the "Preferences" available in the File menu.
  12. C

    Happy Easter To All forum Members

    Yup. Have fun! ... from Pakistan
  13. C

    How to change sound data to binary representation in Digital Comm System Using Matlab

    You can use PCM to convert sound into binary.
  14. C

    should this generate square waves?

    1. square waves? Nope, that wont generate square waves 2. initial seed is a random number that defines the generation pattern of the data. It is random so you can use any seed you like. It would not make a difference
  15. C

    communication blockset for OFDM

    you can contact Muhammad Nadeem Khan the author of the models.
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