基于DSP的电力线载波OFDM调制解调器
coa3=w?wa3?2+1??
cob3=w?wb3?2+1??
sia3=w?wa3?2??
sib3=w?wb3?2??
wa1=wb1+ie?
for?ia0=j? ib0=j+1? ia0<n? ia0+=n1? ib0+=n1?
?//loop of two butterflies caculation
ia1=ia0+n2?
ib1=ib0+n2?
ia2=ia1+n2?
ib2=ib1+n2?
ia3=ia2+n2?
ib3=ib2+n2?
ra1=x?2?ia0?+x?2?ia2??
rb1=x?2?ib0?+x?2?ib2??
ra1=x?2?ia0?-x?2?ia2??
rb1=x?2?ib0?-x?2?ib2??
ta=x?2?ia1?+x?2?ia3??
tb=x?2?ib1?+x?2?ib3??
x?2?ia0?=ra1+ta? // x?2?ia0?
x?2?ib0?=rb1+tb? // x?2?ia0?
ra1=ra1-ta?
rb1=rb1-tb?
sa1=x?2?ia0+1?+x?2?ia2+1??
sb1=x?2?ib0+1?+x?2?ib2+1??
sa2=x?2?ia0+1?-x?2?ia2+1??
sb2=x?2?ib0+1?-x?2?ib2+1??
ta=x?2?ia1+1?+x?2?ia3+1??
tb=x?2?ib1+1?+x?2?ib3+1??
x?2?ia0+1?=sa1+ta?
x?2?ib0+1?=sb1+tb?
sa1=sa1-ta?
sb1=sb1-tb?
x?2?ia2?=?ra1?coa2+sa1?sia2?>>15?
x?2?ib2?=?rb1?cob2+sb2?sib2? >>15?
x?2?ia2+1?=?sa1?coa2-ra1?sia2? >>15?
x?2?ib2+1?=?sb1?cob2-rb1?sib2? >>15?
ta=x?2?ia1+1?-x?2?ia3+1??
ra1=ra2+ta?
rb1=rb2+tb?
《基于DSP的电力线载波OFDM调制解调器(第4页)》