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基于DSP的电力线载波OFDM调制解调器

减小字体 增大字体 作者:佚名  来源:本站整理  发布时间:2009-01-10 22:42:04
1k>>=2

 //number of stage

n1=n2

n2>>=2 // distance between input datas

wa1=0

forj=0j<n2j+=2 //number of butterfies perstage

wb1=wa1+ie

wa2=wa1+wa1

wb2=wb1+wb1 //since heremost of the folow-

ering two instructions are parallel

wa3=wa2+wa1

wb3=wb2+wb1

coa1=wwa12+1

cob1=wwb12+1

sia1=wwa12

sib1=wwb12

coa2=wwa22+1

cob2=wwb22+1

sia2=wwa22

sib2=wwb22

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

ra2=ra2-ta

rb2=rb2-tb

ta=x2ia1-x2ia3

tb=x2ib1-x2ib3

sa1=sa2-ta

sb1=sb2-tb

sa2=sa2+ta

sb2=sb2+tb

x2ia1=ra1coa1+sa1sia1 >>15

x2ib1=rb1cob1+sb1sib1 >>15

x2ia1+1=sa1coa1-ra1sia1 >>15

x2ib1+1=sb1cob1-rb1sib1 >>15

x2ia3=ra2coa3+sa2sia3 >>15

x2ib3=rb2cob3+sb2sib3 >>15

x2ia3+1=sa2coa3-ra2sia3 >>15

x2ib3+1=sb2cob3-rb2sib3 >>15

ie <<=2



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作者:佚名

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