مروري بر جايگاه ایستگاه های پلت فرم ارتفاع بالا برای ارتباطات بی سیم در آینده
الموضوعات :ریحانه کاردهی مقدم 1 , سید وحید زیارت نیا 2
1 -
2 - گروه مهندسی برق، واحد مشهد، دانشگاه آزاد اسلامی، مشهد، ایران.
الکلمات المفتاحية: ارتباط بی سیم, پلتفرم ارتفاع بالا, فرستنده, گیرنده, مخابرات,
ملخص المقالة :
سیستم‌های مخابراتی بی‌سیم به سرعت قابلیت شبکه‌سازی خود را توسعه داده‌اند و خدمات بهتر و پیشرفته‌تری را برای برنامه‌های مختلف مخابراتی بی‌سیم ممکن می‌سازند. روش های مختلفی برای طبقه بندی شبکه های ارتباطی بی سیم بر اساس استفاده از شبکه، فناوری مورد استفاده، پهنای باند و محدوده فرکانس وجود دارد. علیرغم در دسترس بودن سیستم های ماهواره ای، آنها دارای معایبی مانند هزینه های بالا (برای ماهواره ها و پرتاب) و الزامات فنی برای سیستم های ماهواره ای غیر GEO یا امکان پیوستن به سیستم های ماهواره ای GEO هستند. سیستم های زمینی نیز مجموعه ای از مشکلات خاص خود را دارند، مانند هزینه بر بودن و خطرات بالقوه بهداشتی و زیست محیطی. ایستگاه سکوی ارتفاع بالا (HAPS) ایستگاهی است که بر روی جسمی در ارتفاع 20 تا 50 کیلومتری قرار دارد و نسبت به زمین ثابت است. در حالی که آنها مجموعه جدیدی از مشکلات را به ارمغان آورده اند، استقرار HAPS سریع و تدریجی است، تعمیر و نگهداری آسان است، و می توان آنها را بازنشانی و تخصیص داد. تاخیر رفت و برگشت کمتر از 0.5 ثانیه است و می توانند سازگار با محیط زیست (خورشیدی) باشند. به طور کلی، HAPS در ارتفاع حدود 22 کیلومتر کار می کند، که به معنای منطقه خدمات بالقوه با شعاع بیش از 200 کیلومتر، بسته به ارتفاع است. در این مقاله، ما یک بررسی مختصر از HAPS، جنبه های فنی مرتبط با آن و کلیدهای معرفی شده توسط HAPS را پیشنهاد می کنیم.
المصادر:
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[15] !!! INVALID CITATION !!! [15-17].
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[17] A. K. Widiawan and R. Tafazolli, "High altitude platform station (HAPS): A review of new infrastructure development for future wireless communications," Wireless Personal Communications, vol. 42, pp. 387-404, 2007.
[18] J. Gavan, S. Tapuchi, and D. Grace, "Concepts and main applications of high-altitude-platform radio relays," URSI Radio Science Bulletin, vol. 2009, no. 330, pp. 20-31, 2009.
[19] F. Fidler, M. Knapek, J. Horwath, and W. R. Leeb, "Optical communications for high-altitude platforms," IEEE Journal of selected topics in quantum electronics, vol. 16, no. 5, pp. 1058-1070, 2010.
[20] P. Aubineau, S. Buonomo, W. Frank, and K. Hughes, "ITU's regulatory framework, technical studies in ITU-R, and future activities in relation to high-altitude-platform stations (HAPS)," URSI Radio Science Bulletin, vol. 2010, no. 333, pp. 67-74, 2010.
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