Bachelor's thesis

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ΠΑΝΕΠΙΣΤΗΜΙΟ ΠΑΤΡΩΝ ΤΜΗΜΑ ΜΗΧΑΝΙΚΩΝ Η/Υ ΚΑΙ ΠΛΗΡΟΦΟΡΙΚΗΣ ΕΡΓΑΣΤΗΡΙΟ ΕΠΕΞΕΡΓΑΣΙΑΣ ΣΗΜΑΤΩΝ ΚΑΙ ΤΗΛΕΠΙΚΟΙΝΩΝΙΩΝ ΠΑΡΟΥΣΙΑΣΗ ΔΙΠΛΩΜΑΤΙΚΗΣ ΕΡΓΑΣΙΑΣ ΚΑΤΑΝΕΜΗΜΕΝΕΣ ΤΕΧΝΙΚΕΣ ΠΡΟΣΑΝΑΤΟΛΙΣΜΕΝΗΣ ΕΚΠΟΜΠΗΣ ΓΙΑ ΥΠΟΒΡΥΧΙΕΣ ΑΚΟΥΣΤΙΚΕΣ ΕΠΙΚΟΙΝΩΝΙΕΣ ΓΕΩΡΓΙΟΣ Τ. ΚΟΚΚΙΝΟΣ ΕΠΙΒΛΕΠΩΝ : ΚΩΝΣΤΑΝΤΙΝΟΣ ΜΠΕΡΜΠΕΡΙΔΗΣ ΚΑΘΗΓΗΤΗΣ ΤΜΗΥΠ

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Transcript of Bachelor's thesis

  • /

    .

    :

  • 1.

    2.

    3. OFDM SISO MIMO

    4.

  • 1.

    3

    (Underwater

    Acoustic Communications UAC)

    , ,

    UAC

    ,

    (Underwater Acoustics)

  • 1.

    4

    (1/2)

    1490 Leonardo da Vinci :

    ,

    .

    1687 Isaac Newton

    ,

    1826 ,

    Daniel Colladon Charles Sturm.

    1435 m/sec 2%

    1877

    Rayleigh

    To 1912

  • 1.

    5

    (2/2)

    echoranger 1914

    Reginald Aubrey Fessenden

    1919

    1920 1930 ,

    Sonar

    (antisubmarine vessels)

    1946

    , Sonar

    ,

    .

  • 2.

    6

    (1/2)

    :

    (transmission distance)

    (multipath propagation)

    (surface

    and bottom reflections)

    (bandwidth)

    (attenuation)

    (absorption)

    (c 1500 m/sec)

  • 2.

    7

    (2/2)

    (path loss) :

    (spreading loss)

    Thorp

  • 2.

    8

    (1/2)

    :

    o

    ( -1)

    path loss

    (delay) ( = / )

  • 2.

    9

    (2/2)

  • 2.

    10

  • 2.

    11

    (1/2)

    (Scattering), ,

    ,

    , ,

    Rayleigh Rice

    Jakes,

    :

    Bessel

  • 2.

    12

    (2/2)

    MIMO

    MIMO

    (Distributed MIMO)

  • 2.

    13

    :

    (Site

    specific Noise)

    (Ambient Noise)

    (Site

    specific Noise),

    :

    ,

    Gaussian

  • 2.

    14

    (1/3)

    (Ambient Noise),

    :

    (turbulence) / (microseisms)

    (distant shipping activity)

    (breaking waves wind

    speed)

    (thermal

    noise)

    Gaussian ,

  • 2.

    15

    (2/3)

    :

  • 2.

    16

    (3/3)

  • 3. OFDM SISO MIMO

    17

    (Orthogonal Frequency Division Multiplexing)

    (Modulation)

    ,

    OFDM (InterSymbol

    Interference ISI)

    OFDM ,

  • 3. OFDM SISO MIMO

    18

    (1/4)

    OFDM :

    Fourier

    (cyclic prefix)

    OFDM :

    Fourier

  • 3. OFDM SISO MIMO

    19

    (2/4)

    OFDM :

    Fourier :

    :

    OFDM :

  • 3. OFDM SISO MIMO

    20

    (3/4)

    :

    OFDM :

    :

  • 3. OFDM SISO MIMO

    21

    (4/4)

    ,

    EVD (EigenValue Decomposition) :

    :

    :

  • 3. OFDM SISO MIMO

    22

    SISO OFDM

    : OFDM

    :

  • 3. OFDM SISO MIMO

    23

    MIMO OFDM (1/4)

    (Beamforming) :

    - (transmit precoding)

    (receiver shaping)

    (Maximal Ratio Combining Diversity

    MRC)

  • 3. OFDM SISO MIMO

    24

    MIMO OFDM (2/4)

    MIMO :

    OFDM

  • 3. OFDM SISO MIMO

    25

    MIMO OFDM (3/4)

    (Beamformong) :

    (Singular Value Decomposition

    SVD) :

    :

    :

  • 3. OFDM SISO MIMO

    26

    MIMO OFDM (4/4)

    (Maximal Ratio Combining Diversity

    MRC) :

    :

    :

    , ,

  • 4.

    27

    :

  • 4.

    28

    SISO OFDM

    5 km

    50

  • 4.

    29

    MIMO OFDM

    20 km

    50

  • !