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کاهش تداخل عمدی در سیستم‌های مخابراتی رادیوشناختگر با استفاده از تبدیل موجک | ||
| پدافند الکترونیکی و سایبری | ||
| مقاله 5، دوره 9، شماره 4 - شماره پیاپی 36، اسفند 1400، صفحه 55-66 اصل مقاله (1.09 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| نویسندگان | ||
| علی ابراهیمی سوخت آبندانی1؛ میثم بیات* 2؛ رضا هوشمند2 | ||
| 1کارشناسی ارشد، دانشگاه علوم و فنون هوایی شهید ستاری، تهران، ایران | ||
| 2استادیار، دانشگاه علوم و فنون هوایی شهید ستاری، تهران، ایران | ||
| تاریخ دریافت: 24 بهمن 1399، تاریخ بازنگری: 17 خرداد 1400، تاریخ پذیرش: 13 تیر 1400 | ||
| چکیده | ||
| یکی از عوامل مخرب در سامانههای مخابراتی و راداری، تداخل عمدی است، تداخل عمدی با استفاده از جمر به منظور تخریب سامانههای ارتباطی و راداری دشمن ایجاد میشود. اگر تداخل عمدی به خوبی کاهش داده نشود، کارایی سامانه مخابراتی به طور کامل مختل میگردد. جمرها به صورت هدفمند، ایجاد تداخل مینمایند و عملکرد بهینه سامانه را تحت تأثیر قرار میدهند. الگوریتم تطبیقی NLMS یکی از الگوریتم‌های مؤثر در حذف تداخل عمدی است. در این مقاله الگوریتمی جدید برای حذف تداخل عمدی در سامانههای رادیوشناختگر با استفاده از تبدیل موجک ارائه شده است. در شبیهسازیهای انجام شده، از یک سیستم رادیوشناختگر 25 کاربره (به عنوان شبکه قربانی) در مجاورت شبکهای از کاربران اولیه با عملکرد کانالی مارکوف، استفاده شده است. با در نظر گرفتن یازده سناریو مختلف به بررسی عملکرد الگوریتم پیشنهادی پرداخته شده است. برای بررسی عملکرد الگوریتم پیشنهادی از معیار ارسال موفق اطلاعات بر حسب نسبت سیگنال به جمر در هر یک از سناریوها، پرداخته شده است. با توجه به نتایج شبیهسازی، الگوریتم پیشنهادی، در مقایسه با الگوریتم تطبیقی NLMS، بهبود قابل ملاحظهای را از خود نشان میدهد. بر اساس نتایج به دست آمده، الگوریتم پیشنهادی در مقایسه با الگوریتم تطبیقی NLMS، 13درصد بهبود در ارسال موفق را در dB 5= SJR از خود نشان میدهد. | ||
| کلیدواژه‌ها | ||
| تبدیل موجک؛ تداخل عمدی؛ رادیو شناختگر؛ کاربران ثانویه؛ کاهش تداخل؛ مارکوف | ||
| عنوان مقاله [English] | ||
| Interference Mitigation in Cognitive Radio Communication Systems Based on the Wavelet Transform | ||
| نویسندگان [English] | ||
| Ali Ebrahimi Sookht Abanani1؛ meysam Bayat2؛ Reza Hooshmand2 | ||
| 1M.Sc., Shahid Sattari University of Aeronautical Sciences and Technology, Tehran, Iran | ||
| 2Assistant Professor, Shahid Sattari University of Aeronautical Sciences and Technology, Tehran, Iran | ||
| چکیده [English] | ||
| One of the destructive factors in communication and radar systems is intentional interference which is created by using jammers to disrupt the enemy's systems. If the intentional interference is not reduced well, the efficiency of the communication system would be completely disrupted. Jammers purposefully interfere and affect the optimal performance of the system. The NLMS adaptive algorithm is one of effective algorithms in eliminating intentional interference. In this paper, a new algorithm for eliminating intentional interference in cognitive radio systems using wavelet transform is presented. In the simulations, a 25-user cognitive radio system is used as a victim network in the vicinity of a network of primary users with Markov channel functionality. Considering eleven different scenarios, the performance of the proposed algorithm is investigated. To evaluate the performance of the proposed algorithm, the criterion of successful transmission of information in terms of signal to jammer ratio in each of the scenarios is discussed. According to the simulation results, the proposed algorithm, compared to the adaptive algorithm (NLMS), shows a significant improvement. The results, show 13% improvement for the proposed algorithm in successful transmission at SJR=5dB compared to the NLMS adaptive algorithm . | ||
| کلیدواژه‌ها [English] | ||
| Cognitive Radio Network, Intentional Interference, Interference Mitigation, Markov, Secondary Users, Wavelet Transform | ||
| مراجع | ||
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آمار تعداد مشاهده مقاله: 436 تعداد دریافت فایل اصل مقاله: 261 |
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