روشی نوین برای مخابره‌ی داده در کانال‌ آب‌های کم‌عمق بر پایه بانک فیلتر چند حاملی آفست‌دار

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، ،دانشگاه تخصصی فناوری‌های نوین آمل ،آمل ،ایران

2 دانشیار ،دانشگاه تخصصی فناوری‌های نوین ،آمل ،ایران

3 استادیار، دانشگاه صنعتی مالک اشتر،تهران،ایران

چکیده

در کانال‌‌‌های صوتی زیر آب، به علت محدودیت پهنای باند، گسترش تأخیر طولانی ناشی از سرعت کم انتشار امـواج صوتی، و نیز به علت تغییرات شدید زمانی، ایجاد یک ارتباط پایدار و کارآمد همواره با موانع همراه بـوده اسـت. از این رو استفاده از سیستم‌های چند حاملی چند ورودی-چند خروجی چند حاملی متعامد مرسوم بوده، اما چالش آنجاست که به دلیل استفاده از پیشوند چرخشی با طول زیاد برای کانال‌‌های زیر آب، بهره عرض باند و نرخ ارسال داده به شدت کاهش می‌یابد. راهکار پیشنهادی در این مقاله، استفاده از سیستم‌های چند حاملی مبتنی بر بانک فیلتر آفست‌دار است. با بکارگیری این سیستم‌ها به دلیل عدم استفاده از پیشوند چرخشی دیگر مشکلات سیستم تقسیم فرکانسی متعامد را نخواهد داشت و بنابراین شاهد افزایش بهره و افزایش نرخ ارسال در نوع چند ورودی-چند خروجی آن خواهد شد. در این مقاله برای اولین بار از فیلتر شکل دهنده پالس هرمیت استفاده شده است، که دارای دقت و توان عملیاتی بیشتر نسبت به سایر فیلترها می‌باشد. همچنین به جهت حذف تداخل مخرب از برابر‌ساز حداقل میانگین مربعات خطا استفاده گردیده است. نتایج شبیه‌سازی عملکرد مطلوب سیستم مخابره‌ی پیشنهادی زیرسطحی را در آب‌های کم عمق نشان می‌دهد. خروجی شبیه‌سازی‌ها و تحلیل‌های عددی گواه این بوده است که در میزان برابر نرخ خطا، سیستم پیشنهادی میزان 15% نرخ ارسال و دریافت بیشتری را داراست که در شرایط پیچیده زیر آب، دستاورد ارزنده‌ای است.

کلیدواژه‌ها

عنوان مقاله [English]

A new method for data transmission in shallow water channel based on offset multi-carrier filter bank

نویسندگان [English]

  • Farid Samsami Khodadad 1
  • makan ehteshamfar 2
  • fakhroddin nazari 2
  • mohammadali alirezapouri 3
1 Master's student, Specialized University of New Technologies, Amol, Iran
2 Associate Professor, Specialized University of New Technologies, Amol, Iran
3 Assistant Professor, Malek Ashtar University of Technology, Tehran, Iran
چکیده [English]

In underwater acoustic channels, due to the limited bandwidth, the extension of the long delay due to the low speed of sound propagation, and also due to severe time changes, the establishment of a stable and efficient communication has always been accompanied by obstacles. Therefore, the use of orthogonal multi-input multi-Output multi-Carrier systems is common, but the challenge is that due to the use of long-distance rotary prefix for underwater channels, bandwidth gain and data transfer rate are greatly reduced. The proposed solution in this paper is to use multi-carrier systems based on offset bank filters. By using these systems, due to the lack of rotational prefix, the orthogonal frequency division system will no longer have problems and therefore will see an increase in interest and an increase in transmission rate in its multi-input-multi-output type. In this article, for the first time, a Hermit pulse forming filter is used, which has more accuracy and operational power than other filters. Also, in order to eliminate the destructive interference, the equalizer of at least average squares error has been used. The simulation results show the optimal performance of the proposed subsurface transmission system in shallow water. The output of simulations and numerical analysis has shown that at the rate equal to the error rate, the proposed system has a 15% higher send and receive rate, which is a valuable achievement in complex underwater conditions.

کلیدواژه‌ها [English]

  • Underwater transmission
  • offset filter bank
  • orthogonal multi-carrier multi-input-multi-output system
  • Hermite pulse shaping filter
  • equalizer of minimum mean square error

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مراجع

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پدافند الکترونیکی و سایبری
دوره 11، شماره 3 - شماره پیاپی 43
شماره پیاپی 43، فصلنامه پاییز
آبان 1402
صفحه 25-34

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سابقه مقاله

  • تاریخ دریافت: 06 اسفند 1401
  • تاریخ بازنگری: 26 تیر 1402
  • تاریخ پذیرش: 16 مرداد 1402
  • تاریخ انتشار: 06 مهر 1402

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