AD sampling process, using matlab simulation the receiving end in 4 times frequency, sampling, sampling after the amplitude and phase of signal spectrum with the original signal in why?
Attach a simulation program:
clc; The clear
QSET=(1, 1, 3, 3].
For n=25 for 6
A (n, 1)=QSET (randi (4, 1)) + 1 I * QSET (randi (4, 1));
End
For n=258:512
A (n, 1)=conj (a (514 - n, 1));
End
B (129-640, 1)=ifft (a);
B (1:12 8, 1)=b (513:640, 1); % % % and 128 pilot
B (2:6 41, 1)=b (1:6 40, 1);
B (1, 1)=0;
B (642, 1)=0;
For n=1:6 41
For m=1:4
F (4 * n + m - 4, 1)=b (n, 1) + b (b (n + 1, 1) - (n, 1)) * m/4.
End
End
G (1:48, 1)=f (513:2560, 1);
H=FFT (g);
Figure
The plot (abs (h (behold, 2, 1)))
Hold on
The plot (abs (a (2, 1) behold))
Legend (' receiving end after the sampling signal amplitude, 'the sender signal amplitude);
Figure
The plot (Angle (h (behold, 2, 1)))
Hold on
The plot (Angle (a (behold, 2, 1)))
Legend (' receiving end after sampling signal phase, 'the sender signal phase);
To further simplify the problem, if 4 times of six point sampling, will in the first or the last point produced more originally not belong to the three points of the original signal, whether due to this three points to be the problem? Is there any solution, now run on DSP OFDM procedures at the receiving end to restore the signal is not correct, for the first time to do communication that the content of the rocks, for a great god!
