فهرست:
فصل اول: مقدمه
1-1- کلیات.. 2
1-2- تکنولوژی سیستمهای رادیوشناختی. 4
1-2-1-قابلیت هوشمندی. 5
1-2-2-قابلیت دوباره شکل دهی. 5
1-3- معماری فیزیکی شبکههای رادیوشناختی. 6
1-4 - شبکههای رادیوشناختی. 7
1-4-1- اجزای شبکه. 7
1-4-2- ناهمگونی طیف.. 10
1-4-3- چارچوب مدیریت طیف.. 11
1-4-4- اشتراکگذاری طیف.. 12
1-5-تفاوت CRN با شبکههای چندرادیویی و چندکاناله متداول گذشته. 13
1-6- طبفه بندی الگوریتمهای مسیریابی. 14
1-6-1- دسته بندی روشهای مسیر یابی در شبکههای رادیو شناختی اقتضایی. 16
فصل دوم: مروری بر فعالیتهای گذشته در پاسخ به چالشهای مسیریابی
2-1- راهحلهای ارائه شده در پاسخ به چالشهای شبکههای رادیوشناختی. 18
2-1-1- روشهای مبتنی بر تداخل و توان ارسالی. 20
2-1-2- روشهای مبتنی بر میزان تأخیر 21
2-1-3- روشهای مبتنی بر پایداری مسیر 22
2-1-4- روشهای مبتنی بر ماکزیمم کردن بروندهی 23
2-2- معیارهای کمی متداول مسیریابی در شبکههای اقتضایی. 26
2-2-1- دستهبندی معیارهای کمی مسیریابی. 27
2-2-2-منتخب گروه اول، HOP. 28
2-2-3- زمان رفت و برگشت به هاپ(RTT) 30
2-2-4- دفعات ارسال مورد انتظار (ETX) 31
2-2-5-زمان ارسال مورد انتظار (ETT) 33
2-2-6- زمان انحصاری ارسال مورد انتظار(EETT) 34
2-2-7- پیادهسازی چهار معیار انتخابی در الگوریتمAODV. 36
2-2-8- نکات مهم در طراحی معیار کمی بهینه. 39
2-3-استراتژیهای انتخاب کانال در CRN.. 40
2-3-1- دستهبندی استراتژیهای انتخاب کانال. 41
فصل سوم: استخراج یک الگوریتم مسیریابی کارا با استفاده از تکنیکهای دایورسیتی دوگانه در شبیهساز NS2-CRAHN.. 44
3-1- مقدمهای بر چالشهای پیش رویCRAHN.. 44
3-2- فرضیات و مدل سیستم. 46
3-2-1-الگوی فعالیت PUها 48
3-2-2- اساس عملکرد SUها 49
3-3- مدلسازیCRAHN به کمک شبیهسازNS2. 51
3-3-1- فایل مرتبط با فعالیت PUها 53
3-3-2- فایل مرتبط با رویدادهای کانال. 53
3-3-3-مدیریت منابع طیفی. 54
3-3-4- فعالیتSUها 57
3-4- ارائه یک الگوریتم مسیریابی کارایCRAHN مبتنی بر تکنیک ارسالهای چند مسیره و چند کاناله 58
3-4-1- پروتکل AODV. 59
3-5- ارائه یک الگوریتم مسیریابی کارا با استفاده از روش ارسالهای دوگانه در شبکههای رادیوشناختی اقتضایی 67
3-5-1-الگوریتم مرحله RREQ.. 68
3-5-2-الگوریتم مرحله RREP. 70
3-5-3- پروسه نگهداری از مسیر 71
فصل چهارم:شبه سازی
4-1- مقایسه کارایی AODV،D2CARP و الگوریتم پیشنهادی. 74
4-2- تأثیر الگوی عملکرد PUها بر راندمان شبکه. 78
4-2-1- تحلیل عملکرد 85
4-3- آنالیز ناهمگونی طیف.. 89
4-4- مقایسه عملکرد دو روش پیشنهادی و D2CARP بر حسب زمان تشخیص طیف.. 91
4-5- مقایسه عملکرد دو روش پیشنهادی و D2CARP بر حسب سرعت حرکت گرهها 93
4-6- مقایسه عملکرد دو روش پیشنهادی و D2CARP بر حسب نرخ بستههای RREQ.. 94
فصل پنجم: نتیجه گیری و پیشنهادات
5-1- نتیجه گیری. 97
5-2- پیشنهادات.. 100
فهرست منابع و مآخذ: 101
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