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Thread: Concept of MIMO

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    Concept of MIMO

    Modern radio communication systems have to provide higher and higher data rates. As conventional methods like using more bandwidth or higher order modulation types are limited, new methods of using the transmission channel have to be used. Multiple antenna systems (Multiple Input, Multiple Output MIMO) gives a significant enhancement to data rate and channel capacity. This application note gives an introduction to basic MIMO concepts and terminology and explains how MIMO is implemented in different radio communications standards.

    Table of Contents
    1 Introduction...................................... .................................................. . 3
    2 MIMO.............................................. .................................................. .... 3
    2.1 Conventional Radio System (SISO) .................................................. .........................3
    2.2 Multiple Antenna Systems .................................................. ........................................4
    2.2.1 Spatial Diversity .................................................. .................................................. .......6
    2.2.1.1 RX Diversity......................................... .................................................. .......................6
    2.2.1.2 TX Diversity .................................................. .................................................. ..............7
    2.2.2 Spatial Multiplexing .................................................. .................................................. .8
    2.2.3 Beamforming....................................... .................................................. .......................9
    3 MIMO in Radio Communications Systems ....................................... 9
    3.1 3GPP UMTS .................................................. .................................................. ............10
    3.1.1 HSPA+ (3GPP Release 7/8) .................................................. .....................................10
    3.1.2 LTE (3GPP Release 8)................................................ ................................................11
    3.2 WiMAXTM (802.16e-2005) .................................................. .........................................12
    3.3 WLAN (802.11n)......................................... .................................................. ...............13
    3.4 Outlook .................................................. .................................................. ...................15
    4 Rohde & Schwarz Solutions .................................................. .......... 15
    4.1 Signal Generators........................................ .................................................. ............15
    4.2 Signal Analyzers .................................................. .................................................. ....17
    4.3 Mobile Radio Testers........................................... .................................................. ....17
    4.4 Systems .................................................. .................................................. ..................18

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  3. #2
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    Wow! I have always wanted what does it really mean by MIMO. I hope I can find some useful things here.




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