مخابرات پنهان ترکیبی با استفاده از روش طیف گسترده و اختلال کمک کننده
محورهای موضوعی : مهندسی برق و کامپیوتر
مرتضی شفیعی نیستانک
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ایمان کاظمی
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1 - دانشکده مهندسی برق و کامپیوتر، دانشگاه صنعتی مالک اشتر
2 - دانشکده مهندسی برق و کامپیوتر، دانشگاه صنعتی مالک اشتر
کلید واژه: مخابرات پنهان, طیف گسترده, دنباله مستقیم (DS), نویز مصنوعی, اختلال (جمینگ),
چکیده مقاله :
مخابره پنهان با هدف برقراری ارتباط LPD به سرعت در مخابرات تجاری و نظامی در حال توسعه می باشد. یکی از روشهای رایج برای این منظور استفاده از نویز مصنوعی است. اما ایجاد نویز مصنوعی در طیف فرکانسی یا بازه زمانی وسیع، چالشی مهم خواهد بود. همچنین برقراری همزمانی دقیق نویز مصنوعی به گونه ای که نویز محیط را شبیه سازی کند، بسیار دشوار می باشد. در این مقاله با استفاده از طیف گسترده به همراه نویز مصنوعی، روشی ترکیبی برای برقراری مخابره پنهان با رفع مشکلات فوق پیشنهاد داده ایم. گسترش طیف سیگنال ارسالی، ایجاد نویز مصنوعی با سطح توان و هزینه پایین و دائمی را امکانپذیر کرده و نیازی به برقراری همزمانی نیز نخواهد بود. نتایج نشان می دهد در شرایط JSR = -5 dB، استفاده از نویز مصنوعی باند جزئی، حاشیه اطمینان 1/8 dB و کیفیت قابل قبول مخابره را نتیجه خواهد داد. بررسی برای سایر انواع اختلال نشان میدهد غیر از اختلال چندتون امکان استفاده از انواع نویز مصنوعی برای روش پیشنهادی وجود دارد. به عنوان مثال اختلال تک تون نیز با ایجاد 2/6 dB حاشیه اطمینان، مخابره قابل قبول را ایجاد خواهد کرد.
Covert Communication technique is developed for LPD communication in military and civil applications. Artificial Noise (AN) is the method to confuse eavesdropper and assure data transmission. But, generating AN in wide range of frequencies and times is very challenging. Furthermore, it reveals the transmitter or challenges it for synchronization to confuse eavesdropper about environmental noise. This paper proposes a method based on Spread Spectrum as well as self-jamming as AN to solve the problems. By spreading the spectrum, we can generate AN in wide range of frequencies and times, at low power and cost-effective manner. Consequently, there is no need to synchronization. Simulation and numerical results indicate, partial band jammer, effectively confuse the eavesdropper by 1.8 dB margin at JSR = -5 dB. In the situations, transmitter and receiver may communicate at BER = 10^-3 for Eb/N > 8.3 dB. The paper simulates the proposed method for various types of jamming and reports the results where, multitone jamming is rejected for this application as artificial noise. Single-tone jammer also can confuse the eavesdropper by 2.6 dB margin at JSR = -5 dB and TRX communications quality equal to BER = 10-3 for Eb/N > 10.9 dB
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