Non-return to zero conversion from random binary bits

Hello,

I am working on QPSK TX, in the process I need to creat NRZ data but not sure how to do so...can anyone help, pls?

BR MJ

 clear all;
 clc;
 N= 100 ;
 p = 0.5;
 RandomBinaryData1= randperm(N) > (N*p);
 nr_symbols=RandomBinaryData1/2

 %Serial to Parallel bits
 oddBits = RandomBinaryData1(1:2:end);
 evenBits= RandomBinaryData1(2:2:end);