5g-phy-layer-Beamforming 模拟波束赋形和数字波束赋形异同点介绍

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拟波束赋形和数字波束赋形异同点介绍 ,4G引入波束赋形后一直没有弄清楚,这篇文章写得比较详细。
Right before We Introduce o Usually, math explain itself as code does. but I suppose no one is interested in seeing math o No worries, I will explain everything in detail but without(or with a little)math For any place we have to use math, we use the mathematical conclusion directly rather than derivation o If anyone is interested in mathematical derivation, I could explain the details in math as well after this presentation o Any question(including math)is welcome Jianan Liu(Ericsson 5G PHY Layer PartO: From Receiver Diversity May,3,2016 Overview Q Everything Starts From Receiver Diversity Three Types ot of mImo o Transmit diversity (Analog Beam-Forming Spatial Multiplexing(Digital Beam-Forming) o Multi-user MIMO: Industrial Way of Spatial Multiplexing G MIMO in Standard: 2G to 4G ( What will Happen if Number of Antennas Goes to More than 100? o Multi-user Massive mimo o Practical Implementation of Multi-user Massive mimo: mmWave upon high fred ⑤ Is Hybrid Beam-F。 orming Standard of5G? o How to combat with problem which comes from combination of Multi-user Massive MIMo and mmWave Jianan Liu(Ericsson 5G PHY Layer PartO: From Receiver Diversity May,3,2016 4/34 Everything Starts From Receiver Diversity Y Question What if we use more than one antenna at transmitter? ( downlink)? Jianan Liu(Ericsson 5G PHY Layer PartO: From Receiver Diversity May,3,2016 5/34 Three Types of MImo Multiple antennas, usually called as multiple input and multiple output(MIMO o Transmit Diversity o Spatial multiplexing, called as digital beam -forming as wel o Beam-forming, which is called as analog beam-forming nowadays Jianan Liu(Ericsson 5G PHY Layer PartO: From Receiver Diversity May,3,2016 6/34 Transmit Diversity Example(Alamouti Coding Alamouti, a famous engineer, who designed first transmit diversity algorithm which is called as Alamouti Code C2 C1 where denotes complex conjugate Jianan Liu(Ericsson 5G PHY Layer PartO: From Receiver Diversity May,3,2016 7/34 Transmit Diversity 2x1 Alamouti Precoding Decoding Tx Side: h yn, yu H (orthogonal matrix) Rx Side yn =h h, -h yn. =hs 1n+1 +b b n+1 Decoding:(inverse" transpose conjugate) (power constraint ignored here) R P+20 h, h2 R +1 -h:h,ly ,+h n+1 Exercise: Find instantaneous& average decoded SNr Jianan Liu(Ericsson 5G PHY Layer PartO: From Receiver Diversity May,3,2016 8/34 Transmit Diversity Remark The purpose of Transmit Diversity, is gain more reliability (lower BER)on poor propagation environment(e. g. cell edges) LOW sNR. minimize error rate Succeed 99 out of 100 times Jianan Liu(Ericsson 5G PHY Layer PartO: From Receiver Diversity May,3,2016 9/34 (Analog Beam-Forming According to antenna course side lobes maiNlobe back lobe antenna faces to0° Jianan Liu(Ericsson 5G PHY Layer PartO: From Receiver Diversity ay,3,2016 10/34

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