تخصیص بهینه توان در سیستم رله انبوه آنتنی کاملاً دوطرفه متشکل از چند جفت فرستنده-گیرنده و در حضور شنودگر

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده فنی و مهندسی، دانشگاه شهرکرد، شهرکرد، ایران

2 دانشکده فنی و مهندسی - دانشگاه شهرکرد

چکیده

در این مقاله، امنیت لایه فیزیکی یک شبکه مشارکتی متشکل از چند جفت گره منبع-مقصد را در حضور یک گره شنودگر بررسی می‌کنیم. ارتباط ببن گره‌های فرستنده و گیرنده به‌طور همزمان و از طریق یک ایستگاه رله کاملاً دوطرفه مجهز به آرایه آنتنی عظیم برقرار می‌شود و شنودگر منفعل ارتباط بین یک جفت گره‌ موجود در شبکه را استراق سمع می‌کند. فرض می‌کنیم رله از تکنیک‌های پردازش خطی اجبار به صفر، بیشینه نسبت ترکیب و بیشینه نسبت ارسال برای دریافت اطلاعات از گره‌های منبع و ارسال مجدد آن به گره‌های مقصد استفاده می‌کند. در بخش اول مقاله نرخ محرمانگی هر یک از این تکنیک‌های پردازش خطی را محاسبه می‌کنیم و نتایج را به‌فرم بسته و به‌صورت توابعی از پارامترهای سیستم، شامل تعداد جفت گره‌های موجود در سیستم، تعداد آنتن‌های گیرنده و فرستنده در ایستگاه رله و نیز ضرایب تخمین کانال استخراج می‌کنیم. در بخش دوم مقاله و با هدف بهبود امنیت سیستم، یک روش تخصیص توان بهینه در ایستگاه رله و بین گره‌های منبع ارایه می‌شود. مسئله فرموله شده یک مسئله پیچیده غیرمحدب می‌باشد که با تبدیل به یک مسئله برنامه‌ریزی هندسی حل می‌شود. نتایج شبیه‌سازی نشان می‌دهد که روش تخصیص توان ارایه شده می‌تواند نرخ محرمانگی سیستم را تا حد قابل قبولی بهبود دهد.

کلیدواژه‌ها

عنوان مقاله [English]

Optimal Power Allocation in Multipair Full-duplex Relaying Massive MIMO Networks in Presence of Eavesdropper

نویسندگان [English]

  • Akram Bagheri 1
  • Mohammadali. Mohammadi 2
1 Faculty of engineering, Shahrekord university, Shahrekord, Iran
2 Faculty of Engineering, Shahrekord University.
چکیده [English]

 In this paper, we investigate the physical layer secrecy of a multipair cooperative network in presence of an eavesdropper. Simultaneous ccommunication between the transmitter and receiver pairs is established through a massive antenna array equipped full-duplex relay station, while the passive eavesdropper overhears communication between one pair. We consider that the relay uses zero-forcing, maximum mixing ratio, and maximum transmission ratio linear processing techniques. In the first part of the paper, we study the secrecy rate of the adopted linear processing techniques. We derive closed-form expressions for the average secrecy rate as a functions of the system parameters, such as number of pairs, the number of relay’s transmit and receive antennas, and the channel estimation coefficients. In the second part of the paper, in order to improve the system’s secrecy, an optimal power allocation scheme is presented at the relay station and source nodes. The formulated problem is a complex non-convex problem that is solved by recasting as a geometric programming problem. The simulation results show that the proposed power allocation scheme significantly improves the system's secrecy rate.

کلیدواژه‌ها [English]

  • Full-duplex communication
  • massive antenna array
  • secrecy rate
  • achievable rat
  • optimal power allocation

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