Commit ab7fef18131948a94c6a4c35c23c95826600c217
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demapper
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| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% | 1 | 1 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% | |
| % Project code file for ECE 257B SP2018 % | 2 | 2 | % Code file provided by class ECE 257B SP2018 % | |
| % Author: Yu-Jen Ku, Xueshi Hou % | 3 | 3 | % Instructor: Dinesh Bharadia, Manu Seth % | |
| % Department of Electrical and Computer Engineering, % | 4 | 4 | % Department of Electrical and Computer Engineering, % | |
| % University in San Diego, California, USA % | 5 | 5 | % University in San Diego, California, USA % | |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% | 6 | 6 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% | |
| 7 | 7 | |||
| function [map_out]=demapper(data,mode,c) | 8 | 8 | function [map_out]=demapper(data,mode,c) | |
| 9 | 9 | |||
| m_out=data; | 10 | 10 | m_out=data; | |
| % mode : Modulation order in power of 2 (1/2/4/6 = BSPK/QPSK/16-QAM/64-QAM) | 11 | 11 | % mode : Modulation order in power of 2 (1/2/4/6 = BSPK/QPSK/16-QAM/64-QAM) | |
| % c = 1; | 12 | 12 | % c = 1; | |
| 13 | 13 | |||
| switch mode | 14 | 14 | switch mode | |
| case 1 | 15 | 15 | case 1 | |
| b=c*[1 -1]; | 16 | 16 | b=c*[1 -1]; | |
| case 2 | 17 | 17 | case 2 | |
| b=c*[1+1i -1+1i 1-1i -1-1i]; | 18 | 18 | b=c*[1+1i -1+1i 1-1i -1-1i]; | |
| case 4 | 19 | 19 | case 4 | |
| 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]; | 20 | 20 | 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]; | |
| case 6 | 21 | 21 | case 6 | |
| 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]; | 22 | 22 | 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]; | |
| otherwise | 23 | 23 | otherwise | |
| error('wrong choice'); | 24 | 24 | error('wrong choice'); | |
| end | 25 | 25 | end | |
| 26 | 26 | |||
| temp = zeros(size(m_out)); | 27 | 27 | temp = zeros(size(m_out)); | |
| 28 | 28 | |||
| for k=1:length(m_out) | 29 | 29 | for k=1:length(m_out) | |
| z=find( (abs(b-m_out(k))).^2-min(abs((b-m_out(k))).^2)==0); | 30 | 30 | z=find( (abs(b-m_out(k))).^2-min(abs((b-m_out(k))).^2)==0); | |
| if length(z)==1 | 31 | 31 | if length(z)==1 | |
| temp(k)=z-1; | 32 | 32 | temp(k)=z-1; | |
| else | 33 | 33 | else | |
| temp(k)=z(randi(1,1,[1,length(z)]))-1; | 34 | 34 | temp(k)=z(randi(1,1,[1,length(z)]))-1; | |
| end | 35 | 35 | end | |
| end | 36 | 36 | end | |
| 37 | 37 |