qpskmapping.m

信道编码程序

function [symb1, symb2]=QPSKmapping(symbol_per_frame, codeword);
for i=1:symbol_per_frame,
                switch codeword(i,1),
                    case 0,
                        symb1(i)=1;
                    case 1,
                        symb1(i)=j;
                    case 2,
                        symb1(i)=-1;
                    case 3,
                        symb1(i)=-j;
                    otherwise,
                        display('mapping 1 is error');
                end;
                
                switch codeword(i,2),
                    case 0,
                        symb2(i)=1;
                    case 1,
                        symb2(i)=j;
                    case 2,
                        symb2(i)=-1;
                    case 3,
                        symb2(i)=-j;
                    otherwise,
                        display('mapping  2 is error');
                end;
            end;