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基于DSP的电力线载波OFDM调制解调器 | |||||
收集整理:佚名 来源:本站整理 时间:2009-01-10 22:42:04 点击数:[] ![]() |
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1k>>=2 //number of stage n1=n2 n2>>=2 // distance between input datas wa1=0 forj=0j<n2j+=2 //number of butterfies perstage wb1=wa1+ie wa2=wa1+wa1 wb2=wb1+wb1 //since heremost of the folow- ering two instructions are parallel wa3=wa2+wa1 wb3=wb2+wb1 coa1=wwa12+1 cob1=wwb12+1 sia1=wwa12 sib1=wwb12 coa2=wwa22+1 cob2=wwb22+1 sia2=wwa22 sib2=wwb22 coa3=wwa32+1 cob3=wwb32+1 sia3=wwa32 sib3=wwb32 wa1=wb1+ie foria0=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=x2ia0+x2ia2 rb1=x2ib0+x2ib2 ra1=x2ia0-x2ia2 rb1=x2ib0-x2ib2 ta=x2ia1+x2ia3 tb=x2ib1+x2ib3 x2ia0=ra1+ta // x2ia0 x2ib0=rb1+tb // x2ia0 ra1=ra1-ta rb1=rb1-tb sa1=x2ia0+1+x2ia2+1 sb1=x2ib0+1+x2ib2+1 sa2=x2ia0+1-x2ia2+1 sb2=x2ib0+1-x2ib2+1 ta=x2ia1+1+x2ia3+1 tb=x2ib1+1+x2ib3+1 x2ia0+1=sa1+ta x2ib0+1=sb1+tb sa1=sa1-ta sb1=sb1-tb x2ia2=ra1coa2+sa1sia2>>15 x2ib2=rb1cob2+sb2sib2 >>15 x2ia2+1=sa1coa2-ra1sia2 >>15 x2ib2+1=sb1cob2-rb1sib2 >>15 ta=x2ia1+1-x2ia3+1 ra1=ra2+ta rb1=rb2+tb ra2=ra2-ta rb2=rb2-tb ta=x2ia1-x2ia3 tb=x2ib1-x2ib3 sa1=sa2-ta sb1=sb2-tb sa2=sa2+ta sb2=sb2+tb x2ia1=ra1coa1+sa1sia1 >>15 x2ib1=rb1cob1+sb1sib1 >>15 x2ia1+1=sa1coa1-ra1sia1 >>15 x2ib1+1=sb1cob1-rb1sib1 >>15 x2ia3=ra2coa3+sa2sia3 >>15 x2ib3=rb2cob3+sb2sib3 >>15 x2ia3+1=sa2coa3-ra2sia3 >>15 x2ib3+1=sb2cob3-rb2sib3 >>15 ie <<=2 |
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