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Recent content by sadsorry

  1. S

    pn code synchronization

    Hi erece! I want to build a FHSS system and I got the problem about PN synchronization. Please tell me where do you find this picture? Thanks And the answer for your question: it is Passive Correlation. The delay block is inserted to ensure the signals add (sum) at the same time (synchronous)
  2. S

    Output of PN sequence?

    Ah. It's you again. Thanks for you comment. Last time I find the way to recover BPSK signal and I want to say "THANKS".
  3. S

    Output of PN sequence?

    Hi guys! I generate PN code h=commsrc.pn('GenPoly',gfprimdf(4),'InitialStates',[0 0 0 1],'CurrentStates',[0 0 0 1],'Mask',[0 0 0 1],'NumBitsOut',1); but I don't know what is output of h. Is it CurrentStates or something else? I want to implement PN code for FHSS so I really want to know it. Thanks
  4. S

    Use PN sequence to control frequence hopped

    Hi every one! I have a matlab code to create PN sequence like this: h=commsrc.pn('GenPoly',[1 0 1 1],'InitialStates',[0 0 1],'CurrentStates',[0 0 1],'Mask',[0 0 1],'NumBitsOut',1);. And I want use States of h to control frequency hopped but I don't know compare this states to each other. For...
  5. S

    BPSK Demodulation code

    Here is all you need. It's part of my Project. Hope this help clc clear all close all % Generation of bit pattern s=round(rand(1,25)); % Generating 25 bits signal=[]; carrier=[]; t=[0:2*pi/119:2*pi]; % Creating 60 samples for one cosine for k=1:25 if s(1,k)==0...
  6. S

    How to Integral Signal

    Thanks guys! I have done my job. I used trapz but it's not my purpose. I have same idea with albbg . I used intdump (integralanddump) in Communication Tool Box. It will perform integration with period reset and I get expected values. Thanks for support
  7. S

    BPSK Demodulation code

    Hi. I have the same problem. I am trying to demodulate BPSK signal and here is my way: BPSK signal .* carrier => integral => compare with 0 (if >0 is 1 and <0 is -1)=> recover original signal. Use can follow this link: **broken link removed** but if we use LPF, the BER is really high. My...
  8. S

    How to Integral Signal

    Hi guys! I have a signal and I want to integral it. But problem is warnning "First input argument must be a function handle" of matlab. Because this signal is received from the channel (so its function is not defined). Any advise? Thanks
  9. S

    Using Lowpass filter to filter DC component from BPSK signal

    Thanks alot thylacine1975. I presented about this point yesterdat to my teacher and he said:"Using LPF to filter DC component is theoretical way but the BER is high. Try use intergral function in matlab". But when I try to use integral function for de_PSK_signal, matlab warnning "First input...
  10. S

    Using Lowpass filter to filter DC component from BPSK signal

    Thanks you very much! Could you please tell me the meaning of N, FC, 40. Why do you choose 40? I tried some other numbers and still get the result. One more question: How could I recover the original signal from LPF signal because original signal is square wave
  11. S

    Using Lowpass filter to filter DC component from BPSK signal

    Hi guys! I have a code matlab for BPSK demodulation. And I have problem with filtering DC component from BPSK signal. My process is BPSK_sig*carrier=1/2*(1+cos(2wt)) and I want to use LPF to get DC component which recover to original signal What should I do? Thanks alot! And here is my matlab...
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