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1、大規(guī)模MIMO時(shí)分雙工系統(tǒng)的基站天線互易校準(zhǔn)算法第37卷第2期電子與信息學(xué)報(bào)Vol.37No.22015年2月JournalofElectronics&InformationTechnologyFeb.2015顧浙騏張忠培(電子科技大學(xué)通信抗干擾技術(shù)國家級重點(diǎn)實(shí)驗(yàn)室成都611731)摘要:對于采用大規(guī)模MIM0技術(shù)的時(shí)分雙工系統(tǒng),基站天線的互易誤差會破壞上下行基帶信道互易特性,大幅降低系統(tǒng)下行傳輸性能??紤]到大規(guī)模MIM0技術(shù)所帶來的基站天線間的耦合效應(yīng),該文設(shè)計(jì)了基于總體最小二乘估計(jì)的基站天線互易校準(zhǔn)算法,以實(shí)現(xiàn)對基站的天線互易誤差的補(bǔ)償。該算法以增加計(jì)算復(fù)雜度為代價(jià),以及
2、通過增加信道測量樣本,克服了上下行信道估計(jì)誤差對現(xiàn)有天線互易誤差校準(zhǔn)算法的影響。同時(shí),該文通過瑞利商迭代求解降低了該算法的復(fù)雜度。若忽略用戶天線互易誤差,計(jì)算機(jī)仿真結(jié)果表明,該算法相對于現(xiàn)有的基站天線互易誤差校正算法,具有1.8dB左右的性能增益。若考慮用戶天線互易誤差,該算法相對丁己有的算法,具有隨信道估計(jì)誤差方差減小而增大的增益。關(guān)鍵詞:無線通信;大規(guī)模MIM0;信道互易誤差;互易校準(zhǔn)文獻(xiàn)標(biāo)識碼:A中圖分類號:TN92文章編號:1009-5896(2015)02-0405-06DOI:10.11999/JEIT140472*ReciprocityCalibrationforBas
3、eStationAntennainMassiveMIMOTimeDivisionDuplexSystemsGuZhe-qiZhangZhong-pei(NationalKeyLaboratoryofScienceandTechnologyonCommunication,UniversityofElectronicScienceandTechnologyofChina,Chengdu611731,China)Abstract:ThedownlinktransmissionperformanceofthemassiveMIMOTimeDivisionDuplex(TDD)systemis
4、bottleneckedbythechannelreciprocityerrorscalledantennareciprocityerrors.Antennareciprocityerrorsarecausedbythemismatchandmutualcouplingbetweenantennas.Inordertocompensateantennareciprocityerrorsofthebasestation,areciprocitycalibrationalgorithmisproposedinthispaper,whichcanreducetheimpactofchann
5、elestimateerrorsbyusingtotalleastsquareestimationandincreasingchannelmeasurementsamples.Rayleighquotientiterationisalsousedtoreducethecomplexityofthereciprocitycalibrationalgorithminthispaper.Simulationresultsrevealthatthealgorithmproposedinthispapercanachieve1.8dBperformancegainwithrespecttoth
6、etraditionaloneproposedinreferenceswhentheantennareciprocityerrorsofuserequipmentsareignored.Whentheantennareciprocityerrorsofuserequipmentsareconsidered,theperformanceoftheproposedalgorithmincreaseswiththedecreasingvarianceofthechannelestimationerrors.Keywords:Wirelesscommunication;MassiveMIMO
7、;Channelreciprocityerrors;Reciprocitycalibration1引言大規(guī)模MIMO(verylargeMIMO或massiveMIMO)技術(shù)作為未來蜂窩網(wǎng)絡(luò)備選技術(shù),具有系統(tǒng)容量人,基站發(fā)射功率低,射頻模塊可移植性強(qiáng),射頻器件成本低等特點(diǎn)[1,2]。若基站對下行信道狀態(tài)信息(ChannelStateInformation,CSI)理想己知,基于大規(guī)模MIMO技術(shù),基站能通過預(yù)編碼獲得平在實(shí)際系統(tǒng)均90bit/(s?Hz)的