qamlev16.m

正交频分复用系统(OFDM)的频率偏移误差抑制技术仿真程序

function level=QAMlev16(x)
%------------------------------------------------------------------
%this function takes in a 4 bit combination 
%and outputs a voltage level
%this is the reverse process of the
%function levtobin16
%Author: 王博
%Filename: QAMlev16.m
%-------------------------------------------------------------------

if x==[0 0 0 0]
  level=-15;
elseif x==[0 0 0 1]
  level=-13;
elseif x==[0 0 1 0]
  level=-11;
elseif x==[0 0 1 1]
  level=-9;
elseif x==[0 1 0 0]
  level=-7;
elseif x==[0 1 0 1]
  level=-5;
elseif x==[0 1 1 0]
  level=-3;
elseif x==[0 1 1 1]
  level=-1;
elseif x==[1 0 0 0]
  level=1;
elseif x==[1 0 0 1]
  level=3;
elseif x==[1 0 1 0]
  level=5;
elseif x==[1 0 1 1]
  level=7;
elseif x==[1 1 0 0]
  level=9;
elseif x==[1 1 0 1]
  level=11;
elseif x==[1 1 1 0]
  level=13;
else     level=15;
end