بهبود مجموع نرخ کاربران ثانویه و بهره انرژی شبکه رادیوشناختگر با استفاده از تخصیص توان و Successive Relaying
الموضوعات :
1 - دانشگاه سمنان
2 - دانشگاه سمنان
الکلمات المفتاحية: شبکه رادیوشناختگرحذف تداخلهمترازسازی تداخلهاتخصیص توانکیفیت سرویسدهی,
ملخص المقالة :
در این مقاله، یک شبکه رادیوشناختگر ارائه دادهایم که شامل چند کاربر ثانویه و یک کاربر اولیه است. کاربران ثانویه با روش تحت پوشش، از طیف کاربر اولیه استفاده میکنند. کاربر اولیه نیز دارای عملکرد Successive Relay است. در Successive Relay با استفاده از دو رله نیمه دوطرفه به عملکردی مشابه رله تمام دوطرفه ولی با شدت تداخل بین رلهای کمتر میرسیم که باعث بهبود بهره طیفی میشود. همچنین با وجود اضافهشدن کاربران ثانویه، برای حفظ عملکرد صحیح کاربر اولیه و افزایش مجموع نرخ کاربران ثانویه، استفاده از عملکرد Successive Relay در کاربر اولیه را مطرح کردهایم. در شبکه رادیوشناختگر نیز کاربران دارای تداخل هستند که برای حذف تداخل از ایده همترازسازی تداخل بهره گرفتهایم. در ادامه با در نظر گرفتن یک نرخ آستانه برای کاربر اولیه، حداقل توان لازم را برای منبع و رله به منظور تضمین کیفیت سرویسدهی کاربر اولیه به دست آوردهایم. یک مسئله تخصیص توان بیشینهسازی نرخ مجموع کاربران ثانویه ارائه کردهایم و جواب بهینه را به فرم بسته به دست آوردهایم. همچنین یک مسئله بیشینهسازی بهره انرژی شبکه را طرح کردیم که در دو مرحله و با روش حل مسایل کسری، جوابهای بهینه را به فرم بسته به دست آوردیم.
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