مکانیابی بر اساس تفاضل توان سیگنال دریافتی با به کارگیری بهینهسازی محدب در شبکه حسگر بیسیم
الموضوعات :حسن نظری 1 , میثم رئیس دانایی 2 , مرتضی سپهوند 3
1 - دانشگاه جامع امام حسین (ع)
2 - دانشگاه جامع امام حسین (ع)
3 - دانشگاه جامع امام حسین (ع)
الکلمات المفتاحية: بهینهسازی محدبتخمینگر حداکثر درستنماییتفاضل توان سیگنال دریافتیشبکه حسگر بیسیممکانیابی متمرکزمکانیابی هدف,
ملخص المقالة :
برای انجام مکانیابی بر اساس تفاضل توان سیگنال دریافتی در شبکه حسگر بیسیم میبایست توان دریافتی آلوده به نویز را توسط تعدادی حسگر مرجع جمعآوری نمود. به دلیل مشخصبودن تابع چگالی احتمال نویز استفاده از تخمینگر حداکثر درستنمایی بهترین انتخاب خواهد بود. تابع هزینه این تخمینگر غیر خطی و غیر محدب است و تا کنون برای آن جواب تحلیلی ارائه نشده است. یکی از راهحلها برای غلبه بر این مشکل استفاده از روشهای بهینهسازی محدب است. در این مقاله برای غلبه بر این مشکل تابع هزینه تخمینگر حداکثر درستنمایی را به دست میآوریم و آن را با روش آزادسازی نیمهمعین حل میکنیم. شبیهسازیهای کامپیوتری نشان میدهد در شرایطی که حسگرهای شبکه به صورت غیر منظم در محیط پخش شوند تخمینگر جدید نسبت به سایر تخمینگرها جذر متوسط انرژی خطای مکانیابی کمتری را نشان میدهد، یعنی دقت مکانیابی بالاتری دارد. در روش جدید دقت مکانیابی نسبت به سایر روشها تا 20% افزایش مییابد و پیچیدگی محاسباتی آن نیز نسبت به روشهای بهینهسازی محدب 30% کمتر است.
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