Binary to ASCII Conversion

Hi,

I have message of 1x5120 double (binary values 0 and 1). I have to convert this to ASCII. I am supposed to use below method. Can anyone let me know what is the error in the below code, Thanks.

ASCII_1 = Message(1,1:10)*(2.^[0:9])';
u = Message(1,Nsc+1:end); 
wh=2.^[6:-1:0]; 
m=char(u(1:7)*wh');  

for k=1:1:ASCII_1
    m=[m char(u(7*(k-1)+1:7*k)*wh')]; 
end 
disp(m)

Note: Message is 1x5120 double

[Geoff Hayes]

@Darshan Manjunathrao Chawan - is this your code or someone elses? If your code, can you comment to indicate what you are attempting? Are you assuming that each consecutive set of 8 bits corresponds to a single ASCII character? And so your 1x5120 binary array should correspond to a 640 character message?

Also, what is Nsc?

[Darshan Manjunathrao Chawan]

This is my code only. Nsc is 128. I am suppose to get a message which will be in character.

For ex: x = 101010

char(x) = some value in character

Also my 1x5120 binary array should be around 460 to 640 character.

[Geoff Hayes]

Since your code, can you add some comments to it? Also, is one ASCII character represented by 8 bits? If so, how do you take that into account in your code?

[Darshan Manjunathrao Chawan]

Okay let me keep it simple. My task was to use OFDM where the signal is given. Then I have to de-modulate, remove noise, remove Cp and etc according to ofdm block. So i did all these steps and used viterbi decoder to decode the bits and I got message in binary as 1x5120 double binary array. Now I have to convert to decimal and then get the message (Character) back. But I am not getting the end if I use below conversion.

wh=2.^[6:-1:0];

m=char(Message(1:7)*wh');

for l=2:floor(length(Message)/7),

m=[m char(Message(7*(l-1)+1:7*l)*wh')];

end

m

Message is 1x5120double binary array

[David Hill]

You need to know how the message was transmitted for example:

a='cat in hat';
t=dec2bin(double(a),8)';%we are assuming each character is forced to be 8 bits (it is important to know)
t=t(:)'-'0';%we are assuming this is the stream you are getting, but it could be flipped depending on how it was transmitted.

If the above is the case, decoding is as simple as:

r=num2str(t);
r=char(bin2dec(reshape(r(r~=' '),8,[])'))';