Commit 7573b824bb5d7201d406da0513f535226fae8619
1 parent
b9d8be5b4b
Exists in
master
demapper(same as HW1 code)
Showing 1 changed file with 33 additions and 0 deletions Side-by-side Diff
demapper
View file @
7573b82
| 1 | +function [map_out]=demapper(data,mode,c) | |
| 2 | + | |
| 3 | +m_out=data; | |
| 4 | +% mode : Modulation order in power of 2 (1/2/4/6 = BSPK/QPSK/16-QAM/64-QAM) | |
| 5 | +% c = 1; | |
| 6 | + | |
| 7 | +switch mode | |
| 8 | + case 1 | |
| 9 | + b=c*[1 -1]; | |
| 10 | + case 2 | |
| 11 | + b=c*[1+1i -1+1i 1-1i -1-1i]; | |
| 12 | + case 4 | |
| 13 | + b=c*[1+1i 1+3i 1-1i 1-3i 3+1i 3+3i 3-1i 3-3i -1+1i -1+3i -1-1i -1-3i -3+1i -3+3i -3-1i -3-3i]; | |
| 14 | + case 6 | |
| 15 | + b=c*[3+3i 3+1i 3+5i 3+7i 3-3i 3-1i 3-5i 3-7i 1+3i 1+1i 1+5i 1+7i 1-3i 1-1i 1-5i 1-7i 5+3i 5+1i 5+5i 5+7i 5-3i 5-1i 5-5i 5-7i 7+3i 7+1i 7+5i 7+7i 7-3i 7-1i 7-5i 7-7i -3+3i -3+1i -3+5i -3+7i -3-3i -3-1i -3-5i -3-7i -1+3i -1+1i -1+5i -1+7i -1-3i -1-1i -1-5i -1-7i -5+3i -5+1i -5+5i -5+7i -5-3i -5-1i -5-5i -5-7i -7+3i -7+1i -7+5i -7+7i -7-3i -7-1i -7-5i -7-7i]; | |
| 16 | + otherwise | |
| 17 | + error('wrong choice'); | |
| 18 | +end | |
| 19 | + | |
| 20 | +temp = zeros(size(m_out)); | |
| 21 | + | |
| 22 | +for k=1:length(m_out) | |
| 23 | + z=find( (abs(b-m_out(k))).^2-min(abs((b-m_out(k))).^2)==0); | |
| 24 | + if length(z)==1 | |
| 25 | + temp(k)=z-1; | |
| 26 | + else | |
| 27 | + temp(k)=z(randi(1,1,[1,length(z)]))-1; | |
| 28 | + end | |
| 29 | +end | |
| 30 | + | |
| 31 | +dmod_out = de2bi(temp,mode); | |
| 32 | +map_out = reshape(dmod_out',1,mode*length(temp)); |