# random bit to a block of some fix length?

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Chetan Fadnis on 22 Apr 2022
Edited: Bruno Luong on 22 Apr 2022
Sir,
Suppose, I have a binary data sequence and want to modulate it using say M-QAM, M=16 (k=log2(M)=4bits)
x=[011000101010010101000100010000011111110001010....];
s=qammod(x,16);
this generates the modulated data corresponding to only single bit at a time, but
I want to generate it for following, i.e. it should first concatenate four bits together and then modulate
x=[0110,0010,1010,0101,0100,0100,0100,0001,1111,1100,0101,0....]
How to acomplish this?
Thanks in anticipation.

Bruno Luong on 22 Apr 2022
Edited: Bruno Luong on 22 Apr 2022
x='01100010101001010100010001000001111111000101111'
x = '01100010101001010100010001000001111111000101111'
bl = 4;
xb=x-'0'; % convert to binary array
xb(end+(1:mod(-end,bl)))=0; % pad 0 so length xb is multiple of 4
xb=reshape(xb,bl,[])'; % each row is 4-bit chunk
disp(xb)
0 1 1 0 0 0 1 0 1 0 1 0 0 1 0 1 0 1 0 0 0 1 0 0 0 1 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 1 0 1 1 1 1 0