About function idinput - prbs , Why is not change graph although change the number of shift registers?

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I tried the codes as follows.
n = 3 and n=5
u = idinput(200,'prbs',[n,1],[-1,1]);
subplot(311), stairs(u), axis([0 200 -1.2 1.2]);
subplot(312), plot(covf(u,200)), axis([0 200 -0.2 0.2]);
subplot(313), periodogram(u);
But, Graph became same both n=3 and n=5.(See the figure below)
Please help about this problem.

Accepted Answer

Sarvani Panguluri
Sarvani Panguluri on 10 Sep 2020
According to my understanding, you are using the idinput function with Type of generated signal being prbs. As per the documentation,
u=idinput([],Type, Band, Range)
The Band for Type 'prbs' need to be specified in the format [0 B] where B is the inverse of the clock period of the signal.

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