?? qam_mod.m
字號:
function [sig,sig_length] = QAM_MOD(size,input)% sig - output symbols% size - modulation size (4,16,256)% input - vector of bytes to be modulatedAM2 = [-1 1];AM4 = [-3 -1 1 3]; AM4 = 2*AM4/sqrt(AM4*AM4');AM16 = [-15 -13 -11 -9 -7 -5 -3 -1 1 3 5 7 9 11 13 15]; AM16 = 4*AM16/sqrt(AM16*AM16');sig = zeros(1,length(input)*8/log2(size));sig_length = length(input)*8/log2(size);for l=1:length(input) if (size == 256) sig(l) = (AM16(1+ floor((input(l)/16))) +sqrt(-1)*AM16(1+rem(input(l),16)))/sqrt(2); elseif (size == 16) sig(1 + 2*(l-1)) = (AM4(1+floor((input(l)/64))) + sqrt(-1)*AM4(1+rem(floor(input(l)/16) , 4)))/sqrt(2); sig(2 + 2*(l-1)) = (AM4(1+rem(floor(input(l)/4) , 4)) + sqrt(-1)*AM4(1+rem(input(l) , 4)))/sqrt(2); elseif (size == 4) sig(1+ 4*(l-1)) = (AM2(1+(floor(input(l)/128))) + sqrt(-1)*AM2(1+rem(floor(input(l)/64) , 2)))/sqrt(2); sig(2+ 4*(l-1)) = (AM2(1+rem(floor(input(l)/32) ,2)) + sqrt(-1)*AM2(1+rem(floor(input(l)/16) , 2)))/sqrt(2); sig(3+ 4*(l-1)) = (AM2(1+rem(floor(input(l)/8) , 2)) + sqrt(-1)*AM2(1+rem(floor(input(l)/4) , 2)))/sqrt(2); sig(4+ 4*(l-1)) = (AM2(1+rem(floor(input(l)/2) , 2)) + sqrt(-1)*AM2(1+rem(input(l) , 2)))/sqrt(2); end end?? 快捷鍵說明
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -