مخابرات پنهان ترکیبی با استفاده از روش طیف گسترده و اختلال کمک کننده
الموضوعات :
مرتضی شفیعی نیستانک
1
,
ایمان کاظمی
2
1 - دانشکده مهندسی برق و کامپیوتر، دانشگاه صنعتی مالک اشتر
2 - دانشکده مهندسی برق و کامپیوتر، دانشگاه صنعتی مالک اشتر
الکلمات المفتاحية: مخابرات پنهان, طیف گسترده, دنباله مستقیم (DS), نویز مصنوعی, اختلال (جمینگ),
ملخص المقالة :
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.
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