مقاوم‌سازی مدولاسیون جهتی مبتنی بر آرایه چندگانگی فرکانسی در برابر خطای تخمین موقعیت

طیب مسعود, مهدی; خالقی بیزکی, حسین

مقاوم‌سازی مدولاسیون جهتی مبتنی بر آرایه چندگانگی فرکانسی در برابر خطای تخمین موقعیت

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ دانشجوی دکتری،دانشگاه صنعتی مالک اشتر،تهران، ایران

² استاد،دانشگاه صنعتی مالک اشتر، تهران، ایران

چکیده

هم‌زمان با توسعه روزافزون فن‌آوری ارتباطی بی‌سیم مدرن، امنیت و قابلیت اطمینان این سیستم‌ها همواره یکی از چالش‌های پیش روی طراحی آن بوده است. امنیت لایه فیزیکی یک راهکار کارآمد برای تأمین امنیت انتشار در سیستم‌های مخابراتی است که در سال‌های اخیر توجه بسیاری را به خود جلب کرده است. در امنیت لایه فیزیکی مبتنی بر مدولاسیون جهتی چندگانگی فرکانسی، پرتو سیگنال ارسالی به دو بعد زاویه و فاصله وابسته است به‌گونه‌ای که منظومه مدولاسیون صرفاً در محدوده کوچکی در اطراف گیرنده قانونی به‌درستی قابل دریافت بوده و در سایر جهات به‌عمد تخریب می‌شود. اگرچه کار آیی این روش زمانی که موقعیت گیرنده قانونی به‌درستی تعیین گردد، قابل‌قبول است؛ اما با بروز خطای تخمین موقعیت، که امری محتمل در شبکه‌های بی‌سیم سیار است، عملکرد محرمانگی سیستم به‌شدت افت پیدا می‌کند. برای غلبه بر این مشکل، در این مقاله یک راهکار مقاوم‌سازی در برابر خطای تخمین موقعیت ارائه می‌شود به‌گونه‌ای که با بیشینه کردن نرخ محرمانگی ارگادیک سیستم و تخصیص بهینه توان، منجر به بهبود عملکرد امنیت لایه فیزیکی می‌شود. شبیه‌سازی‌های عددی مبین عملکرد مطلوب این روش در مقاوم‌سازی نرخ محرمانگی در برابر خطای تخمین موقعیت گیرنده قانونی است به‌گونه‌ای که نرخ محرمانگی تا یک بیت بر ثانیه بر هرتز در مقایسه با روش غیر‌مقاوم بهبود می‌یابد.

کلیدواژه‌ها

20.1001.1.23224347.1404.13.1.6.1

موضوعات

پردازش سیگنال حوزه های مرتبط

عنوان مقاله [English]

Robust Physical Layer Security Using Frequency Diverse Array Directional Modulation

نویسندگان [English]

Mahdi Tayeb Masoud ¹
- - ²

¹ PhD student, Malek Ashtar University of Technology, Tehran, Iran

² Professor, Malek Ashtar University, Tehran, Iran

چکیده [English]

Parallel to the rapid development of modern wireless communication technologies, the security and reliability of these systems have always been a major challenge in their design. Physical layer security is an effective solution for ensuring security in telecommunications systems, which has gained significant attention in recent years. In physical layer security based on frequency diverse array directional modulation, the beam of the transmitted signal depends on both angle and distance, in a way that the modulation scheme can only be properly received within a small range around the legitimate receiver and is intentionally degraded in other directions. While the effectiveness of this method is acceptable when accurate information about the position of the legitimate receiver is available, it suffers from a severe performance degradation in the presence of positioning estimation errors, which are highly probable in cellular wireless networks. In this paper, a novel solution against positioning estimation errors is proposed to improve the performance of physical layer security by enhancing the secrecy rate of the system. Numerical simulations demonstrate the desirable performance of this method in robustness of the secrecy rate degradation against positioning estimation errors in the legitimate receiver so that the secrecy rate is improved up to one 1 bit per second per Hertz compared to the non-robust method.

کلیدواژه‌ها [English]

Physical Layer Security
Random frequency Diverse Array
Directional Modulation
Position Estimation Error
Secrecy Rate

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