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Recent content by pdcom

  1. P

    viterbi decoder in matlab

    Hi! i am working on implementation of soft decision viterbi decoder in matlab, if someone has the matlab code for its implementation , kindly send it to me. thanks and waiting BR,
  2. P

    Matlab function for rounding a decimal number

    Hi which function in matlab i can use to round a decimal number to my required number of digits. for example if i have a number d= 2.4667 now i want to round it upto 2.5 but if i use round function it will give me only 2. can you help me. thanks BR/
  3. P

    TCM implementation in matlab

    matlab tcm Hi! i want to know why TCM trellis coded modulation is used. and also from simulation point of view what are steps needed to do for its implementation in matlab. thanks BR/
  4. P

    How to keep amplitude of PSK signal constant while doing simulation?

    How can we keep amplitude of PSK signal constant while doing simulation? As we know in PSK information is in angle or phase and not in amplitude but the amplitude is fixed. But when AWGN noise is added to modulated signal the amplitude of signal (both real and imaginary components are changed)...
  5. P

    relationship between power spectral density and variance

    white noise power variance HI! normally it is written PSD is No and variance is No/2, and Bandwidth is not mentioned,What does this means, from your point of view B=1/2 in this case.Is it true reason. Regards
  6. P

    definite integral for BPSK in Rayliegh fading

    Hi! Thanks. your answer is correct. I also know the answer but i need some steps how it the answer is reached.if you can mention the steps briefly it will be very nice. Regards
  7. P

    Pairwise error probabilty (urgently needed)

    Hi! i want to know about pairwise error probability. Lets take example of 4-PAM, here we have 4 symbols s1,s2,s3,s4. No upper bound on average symbol error probabilty will be sum of pairwise probabilties for all symbols for example P(e/s1)=P(s1,s2)+P(s1,s3)+P(s1,s4) and similarly we get...
  8. P

    definite integral for BPSK in Rayliegh fading

    rayliegh fading Hi friends! can anyone help me in solving following integral (in attachment) related to rayliegh fadind channel for BPSK. thanks.
  9. P

    Help me solve a definite integral

    Hi friends! can anyone help me in solving following integral (in attachment). thanks. waiting for solution:D
  10. P

    PSK bandwidth efficiency

    psk bandwidth why PSK is bandwidth efficient. As we see by using QPSK we are inreasing bit rate and also the bandwidth is also increasing. kindly explain!
  11. P

    please help regarding erfc

    Making my question bit easier, as no one has replied to my previous question. why 1-(1-erfc(x))²≈2erfc(x) ?
  12. P

    complementry error fucntion

    what is square of erfc (complementry error fucntion), i.e (erfc(x))². or what will be 1-(1-erfc(x))² or why 1-(1-erfc(x))²≈2erfc(x)
  13. P

    complementry error function

    what is square of erfc (complementry error fucntion), i.e (erfc(x))². thanks:|
  14. P

    relationship between power spectral density and variance

    variance psd can anyone please help me by telling what is the relationship between power spectral density and variance of complex white noise in AWGN. suppose power spectral density of noise is No then what will be its variance and why? thanks
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