random bit to a block of some fix length?

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.

Answer 1

[Bruno Luong]

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