کاهش تداخل عمدی در سیستم‌های مخابراتی رادیوشناختگر با استفاده از تبدیل موجک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد، دانشگاه علوم و فنون هوایی شهید ستاری، تهران، ایران

2 استادیار، دانشگاه علوم و فنون هوایی شهید ستاری، تهران، ایران

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.

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