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

机译：具有不受管理和受管理干扰的无线系统的性能分析和技术。

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摘要

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.
机译：在过去的几十年中，世界见证了无线通信系统的巨大进步，引入了前所未有的应用和服务。这些进步使物联网（IoT）的概念得以实现，几乎每个对象都通过现有的Internet基础结构相互连接。这导致在不同网络中共享相同介质和带宽的无线设备的数量大大增加。因此，期望由此类设备产生的干扰将急剧增加，因此必须研究减轻此类干扰的创新技术。本文研究了无线通信网络中的干扰。本文分为两个部分，分别处理非受控和受控干扰。在第一部分中，我们研究了一个系统的二阶统计量，该系统由一个带有多个天线的接收器，一个期望的用户和多个干扰者组成。具体来说，我们在不同的空间相关性假设下，得出了这种系统的精确封闭式水平交叉速率（LCR）表达式，据我们所知，这是文献首次报道。我们还可以在空间不相关的接收器中获得近似的LCR表达式，以获得更好的洞察力。此外，我们研究了不同系统参数对LCR的影响。然后，我们介绍两个应用程序，在第一个应用程序中，我们首先使用这些新表达式来评估系统的分组错误率（PER）。第二个应用程序在有限状态马尔可夫链（FSMC）建模中使用派生的LCR表达式来评估在部署自动重复请求（ARQ）时系统的吞吐量。我们还提出了一个优化问题，在该问题中，我们找到了使系统吞吐量最大化的数据包长度。在本文的第二部分，我们处理了托管干扰，其中我们使用联合发送和接收波束成形来减轻频率选择性衰落信道的干扰。特别是，我们建议利用保护间隔（例如循环前缀或零填充间隔）来增加所使用的自由度（DoF），从而通过应用干扰对准（IA）迭代方案来增加系统的总速率。 。我们得出每个用户允许的DoF数量的上限，并评估系统的求和率，并将其与文献中报道的其他IA方案进行比较。我们还研究了部分信道状态信息（CSI）对这种系统性能的影响，并提出了一种可靠的波束成形收发器设计。当在存在CSI错误的情况下使用保护间隔时，我们还可以得出系统平均总流速率的近似表达式。此外，我们试图通过调查在存在CSI不确定性的情况下部署IA的上行链路蜂窝系统来解决是对准干扰还是使发射信号正交更好的问题。在该系统中，我们得出平均信元速率的闭式下限和上限以及近似值，并使用派生的表达式相对于正交多址访问（OMA）方案来分析性地确定IA的操作区域。最后，我们提出了一种IA / OMA混合传输方案，以提高网络性能。

著录项

  • 作者

    Ali, Ahmed O. D.;

  • 作者单位

    The University of Texas at Dallas.;

  • 授予单位 The University of Texas at Dallas.;
  • 学科 Electrical engineering.
  • 学位 Ph.D.
  • 年度 2017
  • 页码 143 p.
  • 总页数 143
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 康复医学;
  • 关键词

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