How to generate broadband random signals using matlab

How to use matlab to generate broadband random signals

Matlab Pseudo-random signal generation (M sequence)

There are two main methods explained here, one is to use m file editing, the other is to use simulink to generate

1. Edit with m file

Np=63；% cycle period

delta_T = 1; % clock ticks

a=1；% amplitude

%Initialize M sequence

M(1)=1;

M(2)=0;

M(3)=0;

M(4)=1;

M(5)=1;

M(6)=0;

M_XuLie(Np) = 0;

for n = 1 : Np

temp = xor(M(6), M(5));

if(temp == 0)

M_XuLie(n) = a;

else

M_XuLie(n) = -a;

end

M(6) = M(5);

M(5) = M(4);

M(4) = M(3);

M(3) = M(2);

M(2) = M(1);

M(1) = temp;

end

figure(4)

stairs(M_XuLie)

ylim([-2 2])

illustrate:

1. Principle: Since it is written in code, the expression of the principle may not be very intuitive. The principle will be given in the form of simulation later

2. Period: If there are N shift registers, then the period is 2^N-1

3. Continuation of cycle:

r = 3; % number of cycles

u=repmat(M_XuLie,1,r 1);%Assign the M sequence to the input as the input signal

2. Use simulink to generate M sequence

1 Choose 6 shift registers, which are 1/Z ones. Arrange them in order, and set the initial conditions to 1

2 First link these 6 shift registers, connect the first output to the second input, and so on until the sixth one is connected to OUT, and then connect a scope here to observe the signal waveform or connect it to the work space ( In this case, it is connected to the workspace). Set the variable name and output format as follows.

Note: Try to choose matrix form output, otherwise it will be inconvenient to call.

3 Select a logical operator and adjust it to XOR from the settings, 2 inputs

4 Continue to connect

5 Set parameters, mainly set the step size and total running time (click the menu simulation-configuration parameters settings)

6 Click to run. What is displayed in the scope is the m sequence! Or enter stairs(M_seque)

in the command line

Note: In fact, there are some problems in actual use with this method, that is, the output signal is of bool type, that is, a logical sequence, and cannot be used as the input of the transfer function. If it is in an m file, it can be passed through double Wait for the method to be converted. Simulink should have a method for conversion, but no relevant query has been made yet.

How to generate pn sequence in matlab

for k=1:length(x) gfpretty(x(k,:));end

mPseudo-random sequence Matlab source code

%5 order m sequence

% Enter the following in the MATLAB command window:

% fbconnection=[0 1 0 0 1];

% mseq=＂m＂_sequence(fbconnection);

% mseq

function mseq=＂m＂_sequence(fbconnection)

n=length(fbconnection);

N=2^n-1;

register=[ones(1,n-1) 1]; %The initial state of the shift register

mseq(1)=register(n); %mThe first output symbol of the sequence

for i=＂2:N＂

newregister(1)=mod(sum(fbconnection.*register),2);

for j=＂2:n＂,

newregister(j)=register(j-1);

end;

register=＂newregister＂;

mseq(i)=register(n);

end

Save as m_sequence.m;

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