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د. علي بن حسن القحطاني | Dr. Ali Hasan Alqahtani

Associate Professor

عميد كلية الهندسة التطبيقية | Dean

كلية الهندسة فرع المزاحمية
Al-Muzahmiah Branch, Building: 02, 2st Floor, S-102
المنشورات
فرضية
2016

Rateless Space-Time Block Codes for Large-Scale Multiple-Input Multiple Output Wireless Communication Systems

Alqahtani, Ali H. . 2016

MIMO Massive MIMO STBC Rateless Code

Multiple-input multiple-output (MIMO) communications have attracted significant research interests lately because of their ability to improve the capacity and reliability of wireless channels. An aggressive version of MIMO communications technology using hundreds of antennas, known as large-scale or massive MIMO systems, has also recently emerged and became a candidate for the fifth-generation (5G) cellular system. This emerging technology holds great potential for scaling up the wireless data rates to the Gigabit range targeted in the 5G cellular systems. In massive MIMO systems, large number of antenna elements, possibly hundreds or even thousands, work together to deliver huge data to multiple users on the same time-frequency resources.
Although massive multi-user (MU) MIMO system provides significant capacity boosts in theory, there are still some challenges that need to be tackled in practice. These include the practical difficulties of deploying a large number of antennas on one single base station (BS), and keeping all of them in working condition all the time. Consequently, there may arise situations whereby the massive MIMO channel has lossy characteristics resulting in unreliable transmission. This gives rise to the socalled wireless erasure channels or lossy links in which the performance of the system is significantly degraded. In such cases, some of the transmitted data may be lost or not decodable at the receiver. The conventional fixed-rate codes for wireless link protection do not perform well in such lossy links, especially when the transmitter does not have the channel state information (CSI). Therefore, special techniques must be incorporated in the design of massive MIMO systems to cope with these losses whenever they arise, in order to preserve good system reliability. This is an important practical issue that has not yet been considered in any previous work in the literature on massive MIMO systems.
In this thesis, a rateless space-time block code (RSTBC) is introduced for massive MIMO systems. The role of RSTBC is to compensate for losses in a lossy wireless link, and hence guarantee high link reliability. The study includes design, analysis and numerical evaluation of RSTBC in massive MIMO systems for various scenarios. Furthermore, RSTBC is employed in a multi-cell massive MIMO system to mitigate the effects of signal-to-interference-and-noise ratio (SINR) degradation stemming from pilot contamination. Theoretical analysis along with numerical results are provided to demonstrate the significance of the proposed scheme. Furthermore, experimental setup and results for RSTBC in a MIMO-OFDM (Orthogonal frequency division multiplexing) testbed are presented.

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نوع عمل المنشور
PHD Thesis
مدينة النشر
Riyadh, Saudi Arabia
نوع الفرضية
PHD
المدرسة
King Saud University
مزيد من المنشورات
publications

This study examines the analytical and numerical solution of electromagnetic surface waves supported by a resistive metasurface-covered grounded metamaterial structure.

بواسطة MZ Yaqoob, A Ghaffar, MAS Alkanhal, MY Naz, AH Alqahtani,, Y Khan
2020