مقاوم سازی الگوریتم شکل دهی پرتو
محورهای موضوعی : مخابرات میدان و موج
سجاد دهقانی
1
(
دانشگاه آزاد اسلامی واحد علوم و تحقیقات فارس
)
ناصر پرهیزگار
2
(
دانشکده مهندسی برق- واحد شیراز، دانشگاه آزاد اسلامی، شیراز، ایران
)
کلید واژه: عدم قطعیت, مقاوم سازی, Convex Optimization, شکل دهنده پرتو حداقل واریانس با پاسخ بدون اعوجاج,
چکیده مقاله :
عملکرد الگوریتم‌های شکل‌دهی پرتو در شرایط عدم قطعیت در بردار هدایت و یا در ماتریس کوواریانس داده، به شدت خراب می‌شوند. در این مقاله یک روش جدید برای مقاوم سازی الگوریتم شکل‌دهی پرتو وفقی حداقل واریانس ارائه می‌شود که هم نسبت به عدم قطعیت در بردار هدایت و هم نسبت به عدم قطعیت در ماتریس کوواریانس داده مقاوم می‌باشد. این روش شامل حداقل‌سازی یک مسأله بهینه سازی با تابع هزینه مرتبه دوم و قید غیر محدب است. در این مقاله نشان داده خواهد شد که مسأله بهینه سازی غیر محدب به یک مسأله محدب تبدیل شده و بردار وزن شکل دهنده پرتو مقاوم سازی شده به دست می‌آید.
Adaptive beamforming methods are known to degrade in the presence of steering vector and covariance matrix uncertinity. In this paper, a new approach is presented to robust adaptive minimum variance distortionless response beamforming make robust against both uncertainties in steering vector and covariance matrix. This method minimize a optimization problem that contains a quadratic objective function and a quadratic constraint. The optimization problem is nonconvex but is converted to a convex optimization problem in this paper. It is solved by the interior-point method and optimum weight vector to robust beamforming is achieved.
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