How can I optimize binary file reading in Matlab?

As I explained in my last question ( https://www.experts-exchange.com/questions/24268148/How-do-I-read-a-binary-file-with-a-specific-structure-in-Matlab.html , thanks yuk99 for the help), I developed a function to read a binary raw data file in Matlab.

Each data sample is stored in the file in 2 bytes, it ranges from 0 to 4095 (12 bits).
In the 2 bytes corresponding to a data sample, the upper 4 bits contain an annotation information, and the 12 other bits contain the data sample.

My code works fine for files with small size, but I need to read a file with a size of about 500 Mb, and following error occurs:

 ??? Error using ==> fread
 Out of memory. Type HELP MEMORY for your options.

Could someone help me optimize my code to avoid this error?

fid=fopen(FILENAME,'r','ieee-le');
 
% Read all 2 bytes samples in 16 bits integers and retransform values in binary
A2=dec2bin(fread(fid,inf,'uint16','ieee-le'),16);
 
% Close file
fclose(fid);
 
% Create an array containing the 12 bits of data
sample=bin2dec(A2(:,5:16));

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