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1、第54卷第5期電訊技術(shù)Vo1.54No.52014年5月TelecommunicationEngineeringMfdv2014doi:10.3969/j.issn.1001—893x.2014.05.019引用格式:張愛平,張德民,周洋.TD—LTE—A上行信道估計(jì)中基于加權(quán)的插值算法[J].電訊技術(shù),2014,54(5):626—631.[ZHANGAi—pingZHANGDe—min,ZHOUYang.AWeightedInterpolationAlgorithmforTD—LTE—AUplinkChannelEstimation[J].Teleco
2、mmunicationEngineefing,2014,54(5):626—631.]TD—LTE—A上行信道估計(jì)中基于加權(quán)的插值算法張愛平,張德民,周洋(重慶郵電大學(xué)重慶市移動(dòng)通信技術(shù)重點(diǎn)實(shí)驗(yàn)室,重慶400065)摘要:TD—LTE—A上行信道估計(jì)中的線性插值算法只利用數(shù)據(jù)兩端的兩個(gè)導(dǎo)頻位置的信道響應(yīng)進(jìn)行插值,不能很好擬合信道響應(yīng)。針對(duì)此問題,提出了基于加權(quán)平均的插值算法。該算法以線性插值算法為基礎(chǔ),首先利用連續(xù)3個(gè)導(dǎo)頻位置的信道響應(yīng)進(jìn)行線性插值得到數(shù)據(jù)位置的兩個(gè)初步插值結(jié)果,再在此基礎(chǔ)上引入權(quán)值O/,最后對(duì)初步插值結(jié)果進(jìn)行加權(quán)得到數(shù)據(jù)位置的信道響應(yīng)。在
3、EPA環(huán)境下的MATLAB仿真結(jié)果表明,相對(duì)于線性插值算法,基于加權(quán)的插值算法在不過度增加計(jì)算復(fù)雜度的情況下能降低系統(tǒng)的誤比特率。關(guān)鍵詞:LTE—A;上行信道;信道估計(jì);插值算法中圖分類號(hào):TN929.5文獻(xiàn)標(biāo)志碼:A文章編號(hào):1001—893X【2014)05—0626—06AWeightedInterpolationAlgorithmforTD——LTE——AUplinkChannelEstimationZHANGAi-ping,ZHANGDe—min,ZHOUYang(ChongqingKeyLabofMobileCommunicationsTech
4、nology,ChongqingUniversityofPostsandTelecommunications,Chongqing400065,China)Abstract:InordertoaddresstheproblemthatthelinearinterpolationalgorithmofTD—LTE—Auplinkchannelestimationusesonlytwochannelsrespondinginpilotpositionstointerpolatethechannelresponseandfailestofitthechannelr
5、esponsewell,aninterpolationalgorithmbasedonweightedisproposed.Thealgorithmisbasedonthelinearinterpolationalgorithm.Firstly,thealgorithmusesthreeconsecutivechan—nelresponsesofpilotpositionsandthelinearinterpolationalgorithmtoobtaintwointermediatevaluesandthenintroducestheweights.Fi
6、nally,thechannelresponseofdatapositionsisobtainedbyweightingthein—termediatevalues.InEPAenvironment,theMATLABsimulationresultshowthatcomparedwiththelinearinterpolation,thisnovelalgorithmcanreducethebiterrorrate(BER)ofthesystemwithoutexcessivelyin—creasingthecomputationcomplexity.K
7、eywords:IJTE—A;uplinkchannel;channelestimation;interpolationalgorithmputMultipleOutputOFDM)系統(tǒng)的關(guān)鍵技術(shù)之一,對(duì)1引言把OFDM與MIMO作為物理層關(guān)鍵技術(shù)的TD—LTE信道估計(jì)是OFDM(OrthogonalFrequencyDivi—sionMultiplexing)系統(tǒng)和MIMO-OFDM(MultipleIn——A通信系統(tǒng)的性能具有非常重要的影響。信道估收稿日期:2013—12—02:修回日期:2014—02—21Receiveddate:2013—12-0
8、2;Reviseddate:2014—02-21基金項(xiàng)目:國(guó)家科技