بهينه‌سازي گذردهي در شبکه پخش با حفظ محرمانگي اطلاعات اختصاصي هر گيرنده با استفاده از کدينگ، مدولاسيون و توان ارسالی وفقی
محورهای موضوعی : مهندسی برق و کامپیوتر
1 - دانشگاه اصفهان
کلید واژه: امنيت لايه فيزيکي شبکه پخش کدينگ و مدولاسيون وفقي,
چکیده مقاله :
در اين مقاله روشي براي ارسال بهينه اطلاعات در شبکه پخش ارائه مي‌شود که در آن ضمن حداکثرکردن بهره‌برداري از منابع شبکه، امنيت لايه فيزيکي براي اطلاعات هر کاربر تأمين مي شود، یعني سناريوي ارسال به گونه‌اي تدوين شده که اطلاعات ارسالي هر کاربر صرفاً در گيرنده متناظرش با احتمال خطاي مناسب قابل آشکارسازي است و احتمال خطاي آشکارسازي اطلاعات در گيرنده‌هاي غير خودي تا حد قابل قبولي زياد مي‌باشد. در روش پيشنهادي از تنظيم نرخ گسسته با استفاده از کدبندي و مدوله‌سازي وفقي استفاده مي‌شود و نرخ ارسال بر مبناي سيگنال به نويز لینک‌هاي مختلف تعيين مي‌گردد. حل‌هاي دقيق و تقريبي براي حل مسأله بهينه‌سازي ارائه شده که حل تقريبي ضمن داشتن اختلاف اندک با حل دقيق، پيچيدگي قابل قبولي دارد. بررسي‌هاي عددي حاکي از آن است که اضافه‌شدن قيد امنيت موجب کاهش جزئي نرخ‌هاي قابل دسترسي در شبکه در عوض حفظ محرمانگي اطلاعات خواهد شد.
A new transmission scheme is presented to improve utilization of resource in a broadcast network provisioning physical layer security. In the designed scheme, data of each user is only detectable at its corresponding receiver with a proper bit error rate (BER), while detection BER at other unintended receivers is high enough for improper detection. Adaptive modulation, coding and transmit power is utilized based on the SNRs. Exact and approximate solutions for the formulated problem are presented where approximate solution has acceptable complexity and leads to the comparable results with the exact solution. Numerical evaluations show that a performance degradation is seen at the cost of providing security.
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