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function[u]=idinput(N,types,band,levels)
// generates random binary input signal
//
// Calling Seqence
// u=idinput(N);
// u=idinput([n,nu])
// u=idinput([n,nu,m])
// u=idinput(__,type)
// u=idinput(__,type,band)
// u=idinput(__,type,band,levels)
//
// Parameters
// N : no of binary signals
// [n,nu] : nu channel signal of length n.
// [n,nu,m]: nu channel signal of length nxm and period m.
// type : "rbs" ,"prbs"
// band : frequency band of the signal.
// levels : binary output values
//
// Description
// u = idinput(n) returns a single-channel random binary signal u of length N. By default it’s values are either -1 or 1.
// u = idinput([n,nu]) returns an nu-channel random binary input signal, where each channel signal has length n,the
// signals in each channel are independent from each other.
// u = idinput([n,nu,m]) returns an Nu-channel periodic random binary input signal with specified period and number of
// periods. Each input channel signal is of length m*n.
// u=idinput(___,type) specifies the type of input to be generated:
// 'rbs' — Random binary signal.
// 'prbs'—pseudorandom binary signal.
// u =idinput(___,type,band) specifies the frequency band of the signal.
// u =idinput(___,type,band,levels) specifies the level of the binary generated signal
//
//
// Examples
// u=idinput([20,2,2],'rbs',[0 0.3],[-1 2]);
//
// Author
// Ayush Kumar
[lhs,rhs]=argn(0)
if rhs<4 then // checking the input given with function
levels=[-1 1] // arguments and allocating default value if required
end
if rhs<3 then
band=[0 0.5]
end
if rhs<2 then
types='rbs'
end
if size(N,2)==3 then
P=N(1);
nu=N(2);
M=N(3);
elseif size(N,2)==2 then
P=N(1);
nu=N(2);
M=1;
elseif size(N,2)==1 then
P=N;
nu=1;
M=1;
else
error('erroininputargument');
end
if levels(2)<levels(1) then // error checking
error('levels (1)should be less then levels(2)');
end
if type(types)~=10 then
error('types can be rbs only input valid argument');
end
if(band(2)>1) then
error('band should be in b/w 0-1');
end
function[vec]=randnu(NN,nuu) // nuu channel random normally distributed signal generator
[lhs,rhs]=argn(0)
if rhs<2 then
nuu=1
end
rand('seed',getdate('s'))
for j=1:1:nuu
for i= 1:NN
vec(i,j)=rand(NN,'normal')
end
end
endfunction
if convstr(types)=='rbs' then
u=randnu(5*P,nu);
band=band/2;
if ~and(band==[0 0.5]) then
if(band(1)==0) then
[hz]=iir(8,'lp','butt',[band(2) band(1)],[0 0]); // 8th order butterwoth filter
num=hz(2);
den=hz(3);
for i=1:1:nu
y(:,i)=filter(num,den,u(:,i));
end
elseif(band(2)==0.5) then
[hz]=iir(8,'hp','butt',[band(1) band(2)],[0 0]);
num=hz(2);
den=hz(3);
for i=1:1:nu
y(:,i)=filter(num,den,u(:,i));
end
else
[hz]=iir(8,'bp','butt',band,[0 0]);
num=hz(2);
den=hz(3);
for i=1:1:nu
y(:,i)=filter(num,den,u(:,i));
end
end
u = sign(y(2*P+1:3*P,:)); // taking the middle terms
u = (levels(2)-levels(1))*(u+1)/2+levels(1);// adjusting binary values according to levels
else
u = sign(u(2*P+1:3*P,:));
u = (levels(2)-levels(1))*(u+1)/2+levels(1);
end
elseif convstr(types)=='prbs' then
clockP = floor(1/band(2));
possP = 2.^(3:18)-1;
P1 = max(possP(P/clockP-possP>=0));
if isempty(P1)
P1 = 7;
end
n = find(P1==possP)+2;
if (clockP*P1~=P)
if M>1
warning(msprintf(gettext("%s: period of prbs signal changed to %d and length change to %d"),"idinput",clockP*P1,P1*M*clockP));
P = P1*clockP;
else
n = min(n+1,18);
P1 = 2^n -1;
warning(msprintf(gettext("%s :generated signal is first %d values of a sequence of length %d"),"idinput",P,clockP*P1));
end
end
P1 = 2^n-1;
if n<3 || n>18,
error(msprintf(gettext('Bad conditioning')));
end
fi = -ones(n,1);
if n==3
ind = [1,3];
elseif n==4
ind = [1,4];
elseif n==5
ind = [2,5];
elseif n==6
ind = [1,6];
elseif n==7
ind = [1,7];
elseif n==8
ind = [1,2,7,8];
elseif n==9
ind = [4,9];
elseif n==10
ind = [3,10];
elseif n==11
ind = [9,11];
elseif n==12
ind = [6,8,11,12];
elseif n==13
ind = [9,10,12,13];
elseif n==14
ind = [4,8,13,14];
elseif n==15
ind = [14,15];
elseif n==16
ind = [4,13,15,16];
elseif n==17
ind = [14,17];
elseif n==18
ind = [11,18];
end
for t = 1:clockP:P1*clockP
u(t:t+clockP-1,1) = ones(clockP,1)*fi(n); // LL%% multivariable !!
fi = [prod(fi(ind));fi(1:n-1,1)];
end
u = (levels(2)-levels(1))*(u+1)/2+levels(1);
u = u(1:P,1);
if nu >1
u1 = [u;u];
shift = floor(P/nu);
for ku = 2:nu
u = [u,u1(shift*(ku-1)+1:P+shift*(ku-1))];
end
end
else
error(msprintf(gettext('type can be rbs or prbs only')));
end
if M>1 then // generating periodic input if no. of periods>1
uu = u;
for i = 2:M
u = [uu;u];
end
end
endfunction
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