بهبود پارامترهای تخصیص منابع در رادیو شناختگر مبتنی بر همسونهی تداخل
محورهای موضوعی : ارتباطات بی سیمسید مجید مزینانی 1 , علی حسن نژاد 2
1 - گروه مهندسی برق- دانشگاه بین المللی امام رضا ، مشهد، ایران.
2 - گروه مهندسی برق- دانشگاه بین المللی امام رضا ، مشهد، ایران.
کلید واژه: شبکه رادیو شناختگر, مخابرات چندآنتنه چندحامله, همسونهی تداخل, همسونهی تداخل پرتودهی ویژه,
چکیده مقاله :
همسونهی تداخل یک روش کارآمد در تقلیل تداخل در شبکه های بدون سیم است، که می تواند در شبکه های رادیو شناختگر به کار گرفته شود. در همسونهی تداخل یک ماتریس پیش کدگذار مناسب در هر فرستنده پیدا خواهد شد که همه تداخل ها به بخشی از زیرفضای سیگنال در هر گیرنده محدود می شود، این کار سبب می گردد سیگنال مطلوب در بخش دیگر قرار گیرد. بنابراین سیگنال دلخواه توسط یک فیلتر حذف تداخل مناسب بهراحتی قابل دریافت است. در این مقاله یک روش کاؤمد برای به کارگیری همسونهی تداخل در شبکه رادیو شناختگر ارائه شده است. در روش پیشنهادی گزینش بردارهای پرتودهی برای تشکیل بردارهای گزینش بر اساس بردارهای مجاور با گام هایی به اندازه ی مساوی صورت می گیرد. انتخاب گام های مساوی سبب بهبود سرعت همگرایی الگوریتم شده است. نتایج حاکی از آن است که کارایی و پیچیدگی محاسباتی بسیار بهبود یافته است. برای ارزیابی روش پیشنهادی در تخصیص توان در شبکه مورد بیشینه سازی بهره وری انرژی شبکه و دیگری بیشینه سازی نرخ مجموع شبکه رادیو شناختگر با حفظ نرخ کاربر اولیه در سطح آستانه، آنها ارزیابی شده است. نتایج شبیه سازی نشان دهنده بهبود عملکرد شبکه با استفاده از این روش در هر دو استراتژی است.
Interference Alignment is an efficient method of reducing interference in wireless networks, which can be used in radio cognitive networks. In the interference alignment, a suitable pre-encoder matrix will be found in each transmitter that all interferences are limited to a part of the signal subspace in each receiver, which causes the desired signal to be placed in the other part. Therefore, the desired signal can be easily received by a suitable interference removal filter. In this paper, an efficient method for using interference homogeneity in a cognitive radio network is presented. In the proposed method, the selection of radiation vectors for the formation of selection vectors based on adjacent vectors is done in equal steps. Selecting equal steps improves the convergence speed of the algorithm. The results show that computational efficiency and complexity have been greatly improved. To evaluate the proposed method of power allocation in the network, they are evaluated to maximize the network energy efficiency and the other to maximize the total rate of the cognitive radio network while keeping the initial user rate at the threshold level. The simulation results reveal the improvement of network performance using this method in both strategies.
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