TCE实现文档

INNOFIDEITCECOEFFICIENTTABLE1of15INNOFIDEIArchiveDate:May.28,2013ArchiveVersion:1.1TechnicalDocumentationTCECoefficientTableINNOFIDEITCECOEFFICIENTTABLE2of15INNOFIDEI1REFERENCES...................................................................................................................................32INTRODUCTION..............................................................................................................................43TCE算法.............................................................................................................................................54TCECOEFFICIENTTABLE..........................................................................................................65TCECOEFFICIENTFIXPROCESS..............................................................................................9INNOFIDEITCECOEFFICIENTTABLE3of15INNOFIDEI1References[1]3GPPTS36.211:“EvolvedUniversalTerrestrialRadioAccess(E-UTRA);Physicalchannelsandmodulation”[2]P.Hoeher,”TCMonfrequency-selectiveland-mobilefadingchannels,”inProc.5thTirreniaInt.WorkshoponDig.Comm.,Tirrenia,Italy[3]P.Hoeher,”Two-dimensionalpilot-symbol-aidedchannelestimationbywienerfiltering”inInstituteforcommunicationstechnologygermanaerospaceresearchestablishment,GremanyINNOFIDEITCECOEFFICIENTTABLE4of15INNOFIDEI2Introduction本文档将介绍TCE（timechannelestimation）coefficient的生成过程，下面文档会从TCE算法，TCEcoefficienttable的计算步骤和TCEcoefficienttable的定点处理详细介绍。INNOFIDEITCECOEFFICIENTTABLE5of15INNOFIDEI3TCE算法如下为TCE算法推导过程，建立信道接收模型：YHXN；Y：接收频域信号，H：信道CFR，X：发送频域信号，N：满足2(0,)N的AWGN噪声。设观察变量如下，HXNNYHHHNXXX式(2-1)由于X为ZC或PN序列,模值为1，不改变N的方差，所以N满足2(0,)N，使用MMSE插值算法有，(,)(,,,)(,)HklWklklHkl式(2-2),kl为需要插值ubcarrier和OFDMsymbolindex；,kl为已知H的subcarrier和OFDMsymbolindex，W为2Dwienerfiltercoefficient.由于瑞利衰落信道信道相关函数可以拆分为频域和时域相关函数，即2Dwienerfiltercoefficient可以用两个1D的wienerfiltercoefficient[2]。根据下行RS的位置分布特点可以先完成频域subcarrierwiener插值。因此上式变为，21(,)(,,,)(,)(,)((0,))(,)HHHHHlkWlklkHlkRllkRkIHlk式(2-3)在Rayleigh信道大数统计条件下，信道相关函数收敛在0阶贝塞尔函数上[3]，因此相关函数，0,max(,)(,)(2)HHHHdsRllkRdkJfTd式(2-4)上面描述的l为一个变量的情况，由于在TCE计算时可能需要同时使用几个l位置进行插值运算，所以上式变为：2111(,)(,,(),)((),)((),)((()(),))((),),,HHHHHlkWlkLjkHLjkRlLjkRLjLjkIHLjkjjJ式(2-5)L(j)为使用的RSOFDM符号位置J为使用的RSOFDM符号个数。TCE即时域wienerfiltercoefficient。INNOFIDEITCECOEFFICIENTTABLE6of15INNOFIDEI4TCEcoefficienttablegeneration由第二章可以得到TCE计算公式如下，211210,max0,max1(,())(())((()()))(2(()))((2(()())))HHHHdsdsTCEWlLjRlLjRLjLjIJfTlLjJfTLjLjI式(3-1)TCEcoefficienttable按36.211中RS位置不同分4类，port0,1;port2,3;port5；port7,8，不同port下L(j)如下：port0,1：7,3,0,4,7,111,2,33,0,4,7,11,144,5,6,7()0,4,7,11,14,188,9,104,7,11,14,18,2111,12,13llLjll式(3-2)port2,3：6,1,8,151:8()1,8,15,229:13lLjl式(3-3)port5：3,6,9,12(1:13)3,127__03,6,127__5()3,6,127__03,61,63,6,92,3,4,7,8DLSubframelFDDCentralRBforSubframeFDDCentralRBforSubframeLjTDDCentralRBforsubframeSSPSSP式(3-4)port7,8Forcentral7RB：12.50,5(1:13)5.50,5(1:13)()5.51,2,6,7(1:13)9.53,4,8(1:13)00,5,9FDDSubframelTDDsubframelLjSSPlSSPlSSP式(3-5)port7,8：5.5,12.5(1:13,_7__0,5)2.5,5.51,2,6,7(1:13,_7)()2.5,9.53,4,8(1:13,_7)2.59(1:5,exp_7)0,00,5SubframelexceptcentralRBforsubframeSSPlexceptcentralRBLjSSPlexceptcentralRBSSPlectcentralRBSSP式(3-6)需要生成以下两组TCE系数表：INNOFIDEITCECOEFFICIENTTABLE7of15INNOFIDEI2[6.3096,3.9811,2.5119,1.5849][10,100,200,300,500,700]doppler，2[1,0.1,0.01,0.001][10,60,100,150,200,250,300,400,500,700]doppler由于port0,1和port2,3在本subframel上的TCEcoefficient使用了后一子帧和（或）前一子帧的RS信息，所以前后子帧的RS个数会影响到TCE的计算，具体情况见Table3-1，如果前一（或后一）子帧没有相应的L(j)，TCE计算时就不使用此RS计算。无线帧开始的第一个帧不使用上一无线帧的RS计算TCEcoefficient，无线帧的最后一子帧也不使用下一无线帧的RS计算TCEcoefficient。Port7,8中L(j)=2.5的意思是l=2和3使用相同的TCEcoefficient值，L(j)=5.5,9.5,12.5即5和6,9和10,12和13使用相同的TCEcoefficient值。Table3-1：TCEcoefficient分类以及对于DSP常量名称Portsubframe&SSPsubsetsConstantNamePort0,1DLsubframe;SSP0-8;DDDTCETab_P0P1DDUTCETab_P0P1UDDTCETab_P0P1UDUTCETab_P0P1DSUTCETab_P0P1USU(gap)TCETab_P0P1SSP9;DDSTCETab_P0P1_SSP9UDSTCETab_P0P1_SSP9DSUTCETab_P0P1_SSP9USUTCETab_P0P1_SSP9Port2,3DLsubframe;SSP0-8;DDDTCETab_P2P3DDUTCETab_P2P3UDDTCETab_P2P3UDUTCETab_P2P3DSUTCETab_P2P3SSP9;UDSTCETab_P2P3_SSP9DDSTCETab_P2P3_SSP9DSUTCETab_P2P3_SSP9INNOFIDEITCECOEFFICIENTTABLE8of15INNOFIDEIUSUTCETab_P2P3_SSP9Port5DLsubframe;NATCETab_P5RegSSP1,6TCETab_P5Spec1SSP2,3,4,7,8TCETab_P5Spec0FDDThecentral7RBofDLsubframe0TCETab_P5FDDCentral0FDDThecentral7RBofDLsubframe5TCETab_P5FDDCentral1TDDThecentral7RBofDLsubframe0TCETab_P5TDDCentralDoppler=0SNR=30DLsubframe0,Central6RBTCETab_P5_Subf0_Central6RB_AWGN（未见dsp使用）Port7，8DLsubframeTCEtabel(expectthecentral7RBofsubframe0,5);NATCEtab_P7P8ReqSSP1,2,6,7TCEtab_P7P8Spec0SSP3,4,8TCEtab_P7P8Spec1SSP0,5TCEtab_P7P8Spec2（未见dsp使用）SSP9TCEtab_P7P8Spec3FDDThecentral7RBofDLsubframe0,5TCETab_P7P8FDDCentralTDDThecentral7RBofDLsubframe0,5TCEtab_P7P8TDDCentral0Thecentral7RBofSSP1,2,6,7TCEtab_P7P8TDDCentral1Thecentral7RBofSSP3,4,8TCEtab_P7P8TDDCentral2Thecentral7RBofSSP0,5,9TCEtab_P7P8TDDCentral3（未见dsp使用）Doppler=0S