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Need help to write matlab code for OQPSK modulation

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vldim

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oqpsk

Hello guys, i am looking for the basic modulation code of OQPSK modulation for Matlab.
I have already written the code of QPSK but i cant understand the difference between this code and the OQPSK.
Does anybody have a clue to help me?
 

xa=2*randint(1,2*L)-1; % BPSK signal generation
%xb=2*randint(1,L)-1;
e_xa=xa(1:2:end-1);
o_xa=xa(2:2:end);
rc=rcosine(1,oversamp, 'sqrt');
e_filtered = rcosflt(e_xa,1,oversamp,'filter',rc)*sqrt(oversamp); %filter
o_filtered = rcosflt(o_xa,1,oversamp,'filter',rc)*sqrt(oversamp); %filter
x_deci_r=[e_filtered', zeros(1, ceil(oversamp/2))];
x_deci_i=[zeros(1, ceil(oversamp/2)) o_filtered'];


t = (0:length(x_deci_i)-1)/Fs;

tx_sig = sqrt(1/2)*x_deci_r .* cos(2*pi*fc*t) + sqrt(1/2)*x_deci_i .* sin(2*pi*fc*t);
 
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