Performance analysis of MIMO-OFDM Systems with 830445/   Performance analysis of MIMO-OFDM

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  • MEE10:60

    Performance analysis of MIMO-OFDM

    Systems with focus on WiMAX

    Muhammad Hassan

    Email: m_hassan786@yahoo.com

    Abdul Sattar

    Email: abdulsattar2005@hotmail.com

    This thesis is presented as part of Degree of

    Master of Science in Electrical Engineering

    Blekinge Institute of Technology, Sweden

    2010

    ________________________________________________________________

    Supervisor: Maria Erman

    Examiner: Dr. Jorgen Nordberg

  • Performance analysis of MIMO-OFDM Systems with focus on WiMAX 2010

    Blekinge Tekniska Hgskola, KarlsKrona Page 2

    Abstract:

    The demand of different multimedia services and different internet supported

    applications on mobile devices requires a high speed data rate and good service of

    quality. This can be obtained by implementing multiple Antenna technology on both

    stations i.e. User terminal and base station with an appropriate coding technique, and

    on the other hand MIMO can fulfill 3G & 4G demand and standard with a

    combination of other techniques. The MIMO diversity and MIMO multiplexing are the

    key factors to discuss and matter of concern is to achieve and support high speed data

    rate. MIMO multiplexing is a way to gain robustness and achievement in speed of data

    information.

    This thesis work describes a brief overview of WiMAX technology and MIMO-

    OFDM system and it also discusses the simplest Space time block code (STBC)

    known as Alamouti Space Time Code. The research approach is a literary survey to

    have theoretical understanding of the MIMO-OFDM system and WiMAX.

    The systems error performance is analyzed through simulation which showed the

    simulated results of Multi-Rate Resource Control (MRRC) scheme and Alamouti

    scheme are identical. And also the Bit Error Rate (BER) were checked for different

    MIMO systems, the simulation results shows that the BER improved to agreeable

    value also gains maximum diversity when the number of antennas increased on the

    receiver side. By improving the BER, we will get the better QoS. Matlab simulation

    has been performed, and presented the results, which shows the considerable error free

    transmission (FEC) for MIMO systems in WiMAX technology.

  • Performance analysis of MIMO-OFDM Systems with focus on WiMAX 2010

    Blekinge Tekniska Hgskola, KarlsKrona Page 3

    Acknowledgment:

    In the name of greatest All mighty ALLAH who has always bless me with potential knowledge and

    success.

    We are very thankful to our supervisor Maria Erman for her supervision and Examiner Dr. Jrgen

    Nordberg for their support during our thesis.

    We are also thankful to our friends who help us during our hard times when we need their assistance

    during our thesis report.

    We are especially thankful to our parents, brothers and sisters who have always provided us the

    courage, strength, best wishes, moral and financial support during our whole career.

    We also have best regards for BTH faculty especially Mikael sman and Lena Magnusson who had

    been helpful throughout our masters degree.

  • Performance analysis of MIMO-OFDM Systems with focus on WiMAX 2010

    Blekinge Tekniska Hgskola, KarlsKrona Page 4

    Table of Contents Abstract: ..................................................................................................................................... 2

    Acknowledgment: ...................................................................................................................... 3

    Table of Contents ....................................................................................................................... 4

    List of Figures ........................................................................................................................ 7

    List of Acronyms ................................................................................................................... 8

    CHAPTER 1: ............................................................................................................................ 10

    1.1 Introduction ................................................................................................................... 10

    1.2 Aims and Achievements ................................................................................................ 10

    1.3 Thesis Structure: ............................................................................................................ 11

    CHAPTER 2: The IEEE (Standards) ....................................................................................... 12

    2.1 THE IEEE (Standards-Based Solutions) ....................................................................... 12

    2.2 Overview of the IEEE Standards .................................................................................. 12

    2.2.1 IEEE 802.11 .............................................................................................................. 12

    2.2.2 IEEE 802.16 .............................................................................................................. 13

    2.2.3 2-11 GHz & 10-66 GHz ........................................................................................... 14

    2.3 How the IEEE 802.16 Works ........................................................................................ 15

    2.4 Fading ............................................................................................................................ 16

    2.5 The propagation of wireless Channels .......................................................................... 16

    2.5.1 The Ground wave propogation ................................................................................. 17

    2.5.2 The Sky wave propagation ....................................................................................... 17

    2.5.3 The Line of sight propagation .................................................................................. 18

    CHAPTER 3: Multi Carrier Modulation .................................................................................. 20

    3.1 Multi-Carrier Modulation .............................................................................................. 20

    3.1.1 FDM and OFDM ...................................................................................................... 21

    3.2 OFDM ........................................................................................................................... 21

    3.2.2 Fourier Transform ..................................................................................................... 23

    3.2.3 Guard Band ............................................................................................................... 23

    3.2.4 Interleaving ............................................................................................................... 24

    3.2.5 Windowing ............................................................................................................... 24

    3.2.6 Peak to average power ratio ...................................................................................... 25

    3.3 OFDM Design Issues .................................................................................................... 26

    3.3.1 Useful symbol duration ............................................................................................ 26

    3.3.2 Number of carriers .................................................................................................... 26

    3.3.3 Modulation scheme ................................................................................................... 26

    3.4 Advantages of OFDM ................................................................................................... 26

  • Performance analysis of MIMO-OFDM Systems with focus on WiMAX 2010

    Blekinge Tekniska Hgskola, KarlsKrona Page 5

    3.5 Disadvantages of OFDM ............................................................................................... 27

    CHAPTER 4: Multiple Input Multiple Output ........................................................................ 28

    4.1 MIMO Systems ............................................................................................................. 28

    4.2 Channel Capacity .......................................................................................................... 29

    4.2.1 Channel capacity for SISO ....................................................................................... 29

    4.2.2 Channel Capacity for MISO ..................................................................................... 29

    4.2.3 Channel capacity for SIMO ...................................................................................... 30

    4.2.4 Channel capacity for MIMO ..................................................................................... 30

    4.3 Advantages of MIMO ................................................................................................... 32

    CHAPTER 5: Space Time Coding ........................................................................................... 33

    5.1 Space Time Coding ....................................................................................................... 33

    5.1.1 Differentials STBC ................................................................................................... 33

    5.2 Alamouti Space Time Code ...