طیف سنجی و ارسال داده به طور همزمان با در نظر گرفتن حذف ناقص سیگنال در شبکه های رادیوشناختگر

زراعتکارمقدم, جواد; سروری, محمد; صادقیان, محمد

طیف سنجی و ارسال داده به طور همزمان با در نظر گرفتن حذف ناقص سیگنال در شبکه های رادیوشناختگر

نوع مقاله : مقاله پژوهشی

نویسندگان

جواد زراعتکارمقدم ¹

محمد سروری ²

محمد صادقیان ³

¹ استادیار ،گروه مهندسی برق، دانشکده مهندسی برق و کامپیوتر، دانشگاه بیرجند، بیرجند، ایران

² مربی، گروه مهندسی برق ، دانشکده مهندسی برق و کامپیوتر، دانشگاه بیرجند، بیرجند ، ایران

³ پژوهشگر،دانشگاه صنعتی مالک اشتر، اصفهان، ایران

چکیده

امروزه، هوشمند‌سازی جنگ الکترونیک با استفاده از فناوری رادیوشناختگر می‌تواند بسیار مفید باشد. از نتایج کاربرد این فناوری، توانایی درک محیط اطراف شامل تشخیص خودکار سیگنال‌های دوست از دشمن، شناسایی تهدیدات جمینگ و عملیات انتقال به فرکانس‌های مختلف به منظور جلوگیری از حمله جمینگ می باشد. در سیستم‌های رادیوشناختگر رایج، کاربر ثانویه قبل از شروع گفتگو، با استفاده از الگوهای طیف سنجی مناسب، حضور یا عدم حضور سیگنال کاربر اولیه را تشخیص می دهد. با این حال، از چالش های این روش، کاهش گذردهی کاربر ثانویه است، زیرا هیچ ارسال داده‌ای در بازه زمانی طیف سنجی انجام نمی شود. در این مقاله، با در نظر گرفتن همکاری بین فرستنده و گیرنده ثانویه، شبکه ای شامل طیف سنجی توأم با ارسال اطلاعات مدنظر قرار گرفته است. ابتدا، سیگنال فرستنده‌ ثانویه توسط گیرنده‌ ثانویه کدگشایی می‌شود. سپس، آن را از مجموع سیگنال دریافتی کم می‌کند و در نهایت تشخیص حضور یا عدم حضور کاربر اولیه، از سیگنال باقیمانده انجام می‌شود. برخلاف روش‏های متداول، در این مقاله، حذف ناقص سیگنال و تأثیر خطاهای کدگشایی بر قابلیت اطمینان طیف سنجی ارزیابی و عبارت‌های تحلیلی برای احتمال هشدار خطا حاصل می شود. نتایج شبیه سازی نشان می دهد که ایده‌ی پیشنهادی باعث بهبود بهره وری طیفی سیستم رادیوشناختگر می شود. مقایسه روش پیشنهادی با روش متداول طیف سنجی و همچنین روش های تقسیم آنتنی، تقسیم توانی و تقسیم آنتنی توأم با برداشت انرژی، نشان می دهد که در زمان های طیف سنجی مختلف، گذردهی بیشتری نسبت به سایر روش های ذکر شده حاصل می گردد؛ لذا حداکثر گذردهی 2b/s/Hz بطور مستقل از زمان طیف سنجی قابل دستیابی است.

کلیدواژه‌ها

رادیوشناختگر

طیف سنجی

حذف ناقص سیگنال

گذردهی

موضوعات

امنیت اطلاعات، رمزنگاری، پنهان نگاری، پروتکل ها و استانداردها

عنوان مقاله English

Joint Sensing and Transmission Strategy Considering Imperfect Signal Cancellation in Cognitive Radio Communications

نویسندگان English

Javad Zeraatkar Moghaddam ¹

Mohammad Soruri ²

Mohammad Sadeghian ³

¹ assistant professorDepartment of Electrical and Computer Engineering, University of Birjand, Birjand.Iran

² Instructor.Department of Electrical and Computer Engineering- University of Birjand- Birjand- Iran

³ researcher.Malek-Ashtar University of Technology- Isfahan- Iran

چکیده English

Recently, the smartening of electronic warfare using cognitive radio technology can be very useful. Among the results of the application of this technology, the ability to understand the surrounding environment includes the automatic detection of friendly signals from the enemy, identification of jamming threats and transmission operations to different frequencies in order to prevent jamming attacks. In common cognitive radio systems, the secondary user detects the presence or absence of the primary user's signal by using suitable spectrometric patterns before starting the conversation. However, one of the challenges of this method is the reduction of the secondary user throughput, because no data is sent in the spectrum sensing time frame. In this paper, the idea of joint spectrum sensing and information transmission is studied, which is achieved with the cooperation of the secondary transmitter and receiver. First, the secondary transmitter signal is decoded by the secondary receiver. Then, it is subtracted from the total received signal and finally the presence or absence of the primary user is detected from the remaining signal. Contrary to common methods, in this work, Imperfect Decoding of the signal and the effect of decoding errors on the spectrum sensing reliability is evaluated. Then, analytical expressions for the probability of false alarm are obtained. The simulation results show that the proposed method improves the spectral efficiency of the cognitive radio system. Comparing the proposed method with the conventional sensing method, as well as with the antenna splitting, power splitting, and joint antenna splitting and energy harvesting methods, shows that at different sensing times, the proposed method achieves higher throughput than the other mentioned methods, and a maximum throughput of 2 b/s/Hz can be achieved which is independent of the sensing time.

کلیدواژه‌ها English

Cognitive radio

Spectrum Sensing

Imperfect Decoding

Throughput

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