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LTE MIMO Principle 36.doc

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MIMO Fundamentals Course Objectives: ·Understand basic MIMO concepts. ·Understand advantages of MIMO. ·Understand MIMO transmission models. ·Understand typical application of MIMO technology. Contents 1 System Overview...........................................................................................................................................1 1.1 asic MIMO Concepts.................................................................................................................
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  MIMO Fundamentals Course Objectives: ·Understand basic MIMO concepts. ·Understand advantages of MIMO. ·Understand MIMO transmission models. ·Understand typical application of MIMO technology.  Contents 1 System Overview...........................................................................................................................................1 1.1 asic MIMO Concepts........................................................................................................................11.! MIMO Models in the #$ %ystem......................................................................................................! 2 Basic Principles of MIMO............................................................................................................................5 !.1 MIMO %ystem Models........................................................................................................................&!.! MIMO %ystem Capacity......................................................................................................................'!.( )ey MIMO #echnologies....................................................................................................................*!.(.1 %patial Multiple+ing.................................................................................................................*!.(.! %pace ,iversity.......................................................................................................................1-!.(.( eamforming..........................................................................................................................1!.(. Uplin/ 0ntenna %election.......................................................................................................1&!.(.& Uplin/ MultiUser MIMO......................................................................................................1' 3 MIMO Application.....................................................................................................................................19 (.1 MIMO Mode Overvie2.....................................................................................................................13(.! #ypical 0pplication %cenarios...........................................................................................................!!(.!.1 MIMO ,eployment................................................................................................................!!(.!.! #ransmit ,iversity %cenarios.................................................................................................!((.!.( Closedloop %patial Multiple+ing %cenarios..........................................................................!&(.!. eamforming %cenarios.........................................................................................................!& 4 MIMO System Performance Analysis......................................................................................................29 .1 MIMO %ystem %imulation 4esults 0nalysis.....................................................................................!3.! MIMO %ystem %imulation 4esult %ummary....................................................................................(1    1 System Overview   Knowledge points asic MIMO conceptsMIMO models in the #$ system 1.1 Basic MIMO Concepts Multipleantenna technology is a significant brea/through in 2ireless transmissiontechnology in the mobile communications industry. 5enerally6 multipath effect isregarded as a harmful factor as it causes fading. Multipleantenna technology6 ho2ever6utili7es multipath as a favorable factor. Multiple Input Multiple Output 8MIMO9 technology is the use of multiple antennas at both the transmitter and receiver by utili7ing multiple spatial paths6 as sho2n in igure 1.1 1 . MIMO enables diversity gain or multiple+ing gain by adopting spacetime processingtechnology6 ma/es full use of spatial resources6 and enhances spectrum utili7ation. igure 1.11 MIMO system model In a 2ord6 the basic objectives of MIMO technology are to provide: ·;igher space diversity gain: Combine the space diversity gains of the receivediversity and transmit diversity to provide higher space diversity gain6 ensuresmoother e<uivalent radio channels6 reduce bit error rates6 and enhance systemcapacity. 1  #$=,,=e>=C=1! #$ MIMO ?rinciple · arger system capacity: @hen the %ignal >oise 4atio 8%>49 is high enough and4an/ A 1 on channels6 MIMO: ,ecomposes the user data into multiple parallel data flo2s. #ransmits the data flo2s simultaneously on each antenna at the same fre<uency2hile maintaining total transmit po2er. Identifies the data flo2s by multielement receive antenna arrays in light of thespace characteristics of each parallel data flo2 at the receiverB restores thesrcinal data flo2s by utili7ing the multiuser demodulation technology. 1.2 MIMO Models in the ! System In 2ireless communications6 the follo2ing transmission models are adopted: %ingleInput %ingle Output 8%I%O9 model6 Multiple Input %ingle Output 8MI%O9 model6%ingle Input Multiple Output 8%IMO9 model6 and MIMO model. igure 1.! !sho2sthese transmission models. igure 1.!! %chematic diagram of the typical transmission models In a 2ireless communication system6 antennas are the first section to process signals atthe front end. $nhancing antenna performance and efficiency 2ill bring high gains tothe system. #he traditional antenna system has developed from %I%O to MI%O and%IMO. #o 2ithstand the impact on signal transmission caused by timevarying 2

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Jul 23, 2017
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