پایان نامه حذف تداخل در کانال مرجع رادار پسیو مبتنی بر سیگنال پخش تلویزیون دیجیتال توسط فرستنده های زمینی با رویکرد بازتولید

فهرست:

فصل اول: مقدمه  ...........................................................................................................................................   1

1-1- مقدمه­ای بر رادار پسیو  .....................................................................................................................   2

1-2-  مروری بر سیستم DVB_T .............................................................................................................  5

1-3- ساختار پایان­نامه ..................................................................................................................................... 7

فصل دوم: ساختار فریم OFDM .................................................................................................................... 9

2-1- مقدمه­ای بر OFDM .......................................................................................................................... 10

2-2- ساختار فرستنده و گیرنده­ی OFDM ............................................................................................ 15

2-2-1- پریود سمبل، فواصل و فضای حامل ................................................................................. 16

2-2-2- پیاده سازی با استفاده از FFT و IFFT ........................................................................... 18

2-3- مزایا و معایب سیستم­های OFDM ................................................................................................ 20

2-4- ساختار فریم OFDM در گیرنده­ی DVB-T ................................................................................ 21

2-4-1- نقاط منظومه­ای.................................................................................................................................30

فصل سوم: آشنایی با پخش زمینی تلویزیون دیجیتال ......................................................................... 32

 3-1- معایب انتقال آنالوگ .......................................................................................................................... 33

3-2- مزایای سیستم دیجیتال  ................................................................................................................... 35

3-2-1- کیفیت تصاویر ارسالی دیجیتال و آنالوگ  ...................................................................... 37

3-3- اجزای یک سیستم تلویزیون  ........................................................................................................... 38

3-3-1- طراحی تلویزیون  ................................................................................................................. 40

3-3-2- تلویزیون همراه (DVB_T MOBILE)  .......................................................................... 41

3-4- گسترش جهانی تلویزیون دیجیتال  ................................................................................................ 42

3-4-1- تلویزیون دیجیتال در ایالات متحده  ............................................................................... 42

3-4-2- تلویزیون دیجیتال در اروپا  ................................................................................................ 43

3-4-3- تلویزیون دیجیتال در ژاپن  ................................................................................................ 43

3-4-4- نحوه­ی پوشش DVB_T در ایران  ................................................................................... 44

3-5- سازمان­ها و استانداردهای عمومی تلویزیون دیجیتال  ................................................................ 46

3-6- فرستنده­های تلویزیون دیجیتال  ..................................................................................................... 49  

3-6-1- لزوم فشرده سازی به روش MPEG-2 ............................................................................. 51

3-6-2- کدهای درونی(کد کانولوشنال)  ........................................................................................ 54

3-6-3- مدولاسیون درونی(داخلی)  ................................................................................................ 55

3-6-4- کدگذاری خارجی  ................................................................................................................ 56

3-6-5- مدولاسیون درونی(داخلی)  ............................................................................................... 57

3-7- باند ارسال  ............................................................................................................................................ 58

3-8- منطقه­ی پوشش فرستنده  ................................................................................................................ 58

3-9- دریافت سیگنال دیجیتال  ................................................................................................................. 59

3-10- اصطلاحات دیجیتالی  ...................................................................................................................... 61

فصل چهارم: شبیه­سازی گیرنده­ی سیگنال DVB_T  ........................................................................... 63

4-1- گیرنده­ی سیگنال DVB_T  ............................................................................................................. 64

4-1-1- مشخصات سیستم DVB_T .............................................................................................. 65

4-1-2- گیرنده­ی پیشنهادی  ............................................................................................................ 66

4-2- همزمان­سازی  ...................................................................................................................................... 67

4-3- تخمین آفست فرکانسی   .................................................................................................................. 70

4-4- تخمین کانال ........................................................................................................................................ 76

4-4-1- روش درون یابی خطی  ....................................................................................................... 76

4-4-2- روش کمترین مربعات (LS) ............................................................................................... 78

4-4-3- تخمین کانال متغیر با زمان  .............................................................................................. 81

4-5- همسان­سازی  .....................................................................................................................................  82

4-6- دی­مدولاسیون  ..................................................................................................................................  83

4-7- روش بازتولید  .....................................................................................................................................  83

4-8- حساسیت سنجی روش بازتولید  ....................................................................................................  84

فصل پنجم: نتایج  ........................................................................................................................................... 96

- فهرست منابع .............................................................................................................................................100

- چکیده به زبان انگلیسی 

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