سنجش طیف فرکانسی توسط الگوریتم چند مرحله ای وفقی با روش غیر همکارانه بهینه در رادیو شناختگر به همراه پیاده سازی روی سخت افزار

نوع مقاله : مقاله پژوهشی

نویسندگان

1 امام حسین (ع)

2 دانشجوی دکترای دانشکده فاوای دانشگاه امام حسین (ع)

چکیده

حسگرهای طیفی، به‌عنوان اصلی­ترین بخش یک سامانه رادیو شناختگر، ابزاری هستند که با تشخیص حفره­های طیفی، موجب استفاده بهینه از پهنای باند فرکانسی محیط شده و از تداخل بین کاربران مجاز ممانعت می­کنند. عملکرد این حسگرها به دلایلی مانند اثرات نویز محیطی، سطح پایین سیگنال، محوشدگی، چند مسیرگی و حساسیت گیرنده، همواره با مشکل مواجه می­شود. در این مقاله، ابتدا با استفاده از روش چند آنتنه در گیرنده با اخذ سیگنال­های محیطی و استفاده از روش آشکارساز انرژی، آستانه آشکارسازی به‌صورت وفقی با روش CFAR تعیین ‌شده و سنجش اولیه طیف محیطی انجام می­گیرد. محدوده­ای از طیف که سیگنال در آن تشخیص داده نشده جهت تصمیم­گیری به مرحله نهایی وارد می­گردد. در این مرحله، سنجش نهایی طیف با یافتن مقادیر ویژه ‌ماتریس کوواریانس سیگنال توسط روش MME  به‌صورت کاملاً کور و غیر همکارانه صورت می‌گیرد که باعث افزایش قابلیت اطمینان در تصمیم­گیری و افزایش احتمال آشکارسازی صحیح حفره­های طیفی و جلوگیری از تداخل کاربران مجاز می­شود. نتایج شبیه­سازی­ها حاکی از احتمال آشکارسازی 75درصدی درSNR محیطی         dB25- می‌باشد که در مقایسه با مراجع بهبود dB15را داشته است. همچنین نتایج شبیه­سازی این مقاله بعد از پیاده­سازی روی برد سخت‌افزاری با نتایج حاصل از آزمون عملی در محیط واقعی مقایسه شده است.

کلیدواژه‌ها


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