الگوریتم شکل‌دهی پرتو در کدهای فرکانس-زمان-فضا (STFBF) برای دستیابی به مرتبه‌ی کامل چندگانگی و بهبود کیفیت مخابره

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار مخابرات دانشگاه علوم و فنون هوائی شهید ستاری-دانشکده مهندسی برق

2 دانشگاه آزاد اسلامی-واحد تهران جنوب

3 دانشگاه علوم و فنون هوائی شهید ستاری-دانشکده مهندسی برق

چکیده

استفاده از سامانه‌های مخابراتی با نرخ داده بالا همراه با کیفیت خدمات مطلوب، زیرساخت یک سامانه‌ فرماندهی و کنترل (C4I) است که در شرایط بحران باید با بهترین کیفیت مخابره، مورداستفاده قرار گیرد. به‌کارگیری چنین ساختاری در سامانه‌های پدافندی نوین از موضوعات تحقیقاتی بسیار مهم است. ازآنجاکه افزایش پهنای باند و یا توان ارسالی به‌منظور افزایش نرخ داده، راه‌کاری پرهزینه و گاهی غیرعملی است، استفاده از سامانه‌های تقسیم فرکانسی متعامد چند ورودی/چند خروجی (MIMO-OFDM) به یکی از فن‌آوری‌های اصلی سامانه‌های مخابراتی نسل چهارم تبدیل‌شده است. به‌تازگی روش‌های کدینگ فرکانس-زمان-فضا  (STF) برای بهبود بهره چندگانگی توسعه‌یافته است. این مقاله با استفاده از ترکیب روش شکل‌دهی پرتو و STF به تجزیه و تحلیل MIMO-OFDM می‌پردازد. روش پیشنهادی STFBF که ترکیب این دو روش است، از لحاظ نرخ خطای بیت نسبت به STF بدون شکل‌دهی پرتو، عملکرد بهتری دارد و همچنین الگوی پیشنهادی نسبت به ترکیب روش شکل‌دهی پرتو و روش کد بلوکی زمان-فضا (STBC) نیز عملکرد بهتری دارد.

کلیدواژه‌ها


عنوان مقاله [English]

Frequency-Time-Space Beam Forming (STFBF) Algorithm to Achieve Full-Order Multiplicity and Improve Transmission Quality

نویسندگان [English]

  • M. Nejati Jahromi 1
  • M. Sharifzade 2
  • A. M. Sazdar 3
1 Department of Electrical Engineering, Shahid Sattary Aeronautical University of Science and Technology, Tehran, Iran
2 Islamic Azad University South Tehran Branch
3 Department of Electrical Engineering, Shahid Sattary Aeronautical University of Science and Technology
چکیده [English]

Using the high-speed data communication systems, along with the quality of service desirable, is the infrastructure of a command and control system (C41) that should be used in the worst case scenario with the best transmission quality. The use of such a structure in the new defensive systems is very important research topics. As bandwidth increase to increase data rates is costly and sometimes impractical, the use of the orthogonal frequency division multiplexing systems (MIMO-OFDM) The main technology has become the 4G systems. Because of this,         multi-channel systems in wireless systems are used to improve the transmission quality and high-speed telecommunication data, and recently, Frequency-Time-Space Coding (STF) methods have been developed to improve multiplicity interest. The purpose of this paper is to analyze the MIMO-OFDM using a combination of beam shaping and STF techniques. The proposed STFBF method, which combines these two methods, performs better in terms of bit error rates than STF without beamforming and the proposed model is better than the combination of beamforming method and time-space block method (STBC).

کلیدواژه‌ها [English]

  • Space-Time -Frequency (STF) Coding
  • Multi-Input Multi-Output System
  • Orthogonal Frequency Division
  • Beam Shaping
  • Multiplicity Order
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