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Performance Analysis and Techniques for Wireless Systems with Unmanaged and Managed Interference.

機(jī)譯：具有不受管理和受管理干擾的無線系統(tǒng)的性能分析和技術(shù)。

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In the past few decades, the world has witnessed enormous advances in wireless communication systems introducing unprecedented applications and services. Such advances brought the idea of Internet of Things (IoT) to life, where almost every object is interconnected to each other through the existing Internet infrastructure. This results in enormous increase in the number of wireless devices sharing the same medium and bandwidth in different networks. Consequently, interference generated by such devices is expected to increase drastically, and hence innovative techniques to mitigate such interference have to be investigated. In this dissertation, we investigate the interference in wireless communication networks. The dissertation is divided into two parts dealing with unmanaged and managed interference, respectively.;In the first part, we investigate the second order statistics of a system consisting of a single receiver with multiple antennas, a single desired user and multiple interferers. Specifically, we derive exact closed-form level-crossing rate (LCR) expressions for such a system under different spatial correlation assumptions which, to the best of our knowledge, are reported for the first time in literature. We also derive an approximate LCR expression in the spatially uncorrelated receiver to get better insight. Moreover, we investigate the effect of the different system's parameters on the LCR. Then, we introduce two applications where in the first we use these new expressions to evaluate the system's packet error rate (PER). The second application uses the derived LCR expressions in Finite-State Markov Chain (FSMC) modeling to evaluate the system's throughput when deploying Automatic Repeat Request (ARQ). We also formulate an optimization problem where we find the packet length maximizing the system's throughput.;In the second part of the dissertation, we deal with managed interference where we use joint transmit and receive beamforming to mitigate the interference for frequency selective fading channels. In particular, we propose exploiting the guard intervals, e.g., the cyclic prefix or the zero-padding intervals, to increase the degrees of freedom (DoFs) used, and consequently the sum rate of the system through applying interference alignment (IA) iterative schemes. We derive an upper bound on the number of allowable DoFs per user and evaluate the system's sum rate and compare it with other IA schemes reported in literature. We also investigate the effect of partial channel state information (CSI) on the performance of such a system and propose a robust beamforming transceiver design. We also derive an approximate expression for the system's average sum stream rate when exploiting the guard interval in transmission in presence of CSI error. Furthermore, we attempt to address the question whether it is better to align the interference or orthogonalize the transmitted signals through investigating an uplink cellular system deploying IA in presence of CSI uncertainty. In this system, we derive closed-form lower and upper bounds and approximation for the average cell rate and use the derived expressions to determine analytically the operation regions of IA relative to orthogonal multiple access (OMA) schemes. Finally, we propose a hybrid IA/OMA transmission scheme to improve the network performance.
機(jī)譯：在過去的幾十年中，世界見證了無線通信系統(tǒng)的巨大進(jìn)步，引入了前所未有的應(yīng)用和服務(wù)。這些進(jìn)步使物聯(lián)網(wǎng)（IoT）的概念得以實(shí)現(xiàn)，幾乎每個(gè)對象都通過現(xiàn)有的Internet基礎(chǔ)結(jié)構(gòu)相互連接。這導(dǎo)致在不同網(wǎng)絡(luò)中共享相同介質(zhì)和帶寬的無線設(shè)備的數(shù)量大大增加。因此，期望由此類設(shè)備產(chǎn)生的干擾將急劇增加，因此必須研究減輕此類干擾的創(chuàng)新技術(shù)。本文研究了無線通信網(wǎng)絡(luò)中的干擾。本文分為兩個(gè)部分，分別處理非受控和受控干擾。在第一部分中，我們研究了一個(gè)系統(tǒng)的二階統(tǒng)計(jì)量，該系統(tǒng)由一個(gè)帶有多個(gè)天線的接收器，一個(gè)期望的用戶和多個(gè)干擾者組成。具體來說，我們在不同的空間相關(guān)性假設(shè)下，得出了這種系統(tǒng)的精確封閉式水平交叉速率（LCR）表達(dá)式，據(jù)我們所知，這是文獻(xiàn)首次報(bào)道。我們還可以在空間不相關(guān)的接收器中獲得近似的LCR表達(dá)式，以獲得更好的洞察力。此外，我們研究了不同系統(tǒng)參數(shù)對LCR的影響。然后，我們介紹兩個(gè)應(yīng)用程序，在第一個(gè)應(yīng)用程序中，我們首先使用這些新表達(dá)式來評估系統(tǒng)的分組錯(cuò)誤率（PER）。第二個(gè)應(yīng)用程序在有限狀態(tài)馬爾可夫鏈（FSMC）建模中使用派生的LCR表達(dá)式來評估在部署自動重復(fù)請求（ARQ）時(shí)系統(tǒng)的吞吐量。我們還提出了一個(gè)優(yōu)化問題，在該問題中，我們找到了使系統(tǒng)吞吐量最大化的數(shù)據(jù)包長度。在本文的第二部分，我們處理了托管干擾，其中我們使用聯(lián)合發(fā)送和接收波束成形來減輕頻率選擇性衰落信道的干擾。特別是，我們建議利用保護(hù)間隔（例如循環(huán)前綴或零填充間隔）來增加所使用的自由度（DoF），從而通過應(yīng)用干擾對準(zhǔn)（IA）迭代方案來增加系統(tǒng)的總速率。 。我們得出每個(gè)用戶允許的DoF數(shù)量的上限，并評估系統(tǒng)的求和率，并將其與文獻(xiàn)中報(bào)道的其他IA方案進(jìn)行比較。我們還研究了部分信道狀態(tài)信息（CSI）對這種系統(tǒng)性能的影響，并提出了一種可靠的波束成形收發(fā)器設(shè)計(jì)。當(dāng)在存在CSI錯(cuò)誤的情況下使用保護(hù)間隔時(shí)，我們還可以得出系統(tǒng)平均總流速率的近似表達(dá)式。此外，我們試圖通過調(diào)查在存在CSI不確定性的情況下部署IA的上行鏈路蜂窩系統(tǒng)來解決是對準(zhǔn)干擾還是使發(fā)射信號正交更好的問題。在該系統(tǒng)中，我們得出平均信元速率的閉式下限和上限以及近似值，并使用派生的表達(dá)式相對于正交多址訪問（OMA）方案來分析性地確定IA的操作區(qū)域。最后，我們提出了一種IA / OMA混合傳輸方案，以提高網(wǎng)絡(luò)性能。

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  • 作者

    Ali, Ahmed O. D.;

  • 作者單位

    The University of Texas at Dallas.;

  • 授予單位 The University of Texas at Dallas.;
  • 學(xué)科 Electrical engineering.
  • 學(xué)位 Ph.D.
  • 年度 2017
  • 頁碼 143 p.
  • 總頁數(shù) 143
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類 康復(fù)醫(yī)學(xué);
  • 關(guān)鍵詞

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