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Performance analysis, pilot designs, and algorithms for massive MIMO systems

机译：大规模MIMO系统的性能分析，试验设计和算法

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摘要

There is continuing growth in demand for data rate. Data rate of tens of megabits per second should be supported for each of tens of thousands of users, and this brings its own technical challenges. One of the solutions recently proposed in the literature is the use of many antenna elements, and such a system is called massive Multiple-Input Multiple-Output (MIMO) system. Having closed-form achievable rate is very useful from both theoretical and practical perspectives. In this dissertation we develop closed form achievable rate for downlink (DL) of massive MIMO under pilot contamination problem with and without DL pilot transmission. Also we develop performance bounds on achievable rate in uplink (UL) of massive MIMO. Then we propose a new channel estimator for a multi-cell massive MIMO scenario with performance close to the ideal Minimum Mean Square Error (MMSE) channel estimator but less knowledge of long term statistics of channels. Also we develop power allocation for massive MIMO based on maximizing sum-rate.;Then we tackle one of the main challenges of massive MIMO, which is working in Frequency Division Duplex (FDD) mode. Due to large pilot overhead, usually in the literature it is assumed massive MIMO operates in Time Division Duplex (TDD) mode. But, many practical systems work in FDD mode over different frequency bands. In this thesis we propose new transmission/transceiver architectures for massive MIMO called rotated FDD (RFDD) which let the massive MIMO work in non-contiguous bands. In addition, we develop and analyze rate adaptation mechanism between UL and DL when operating in non-contiguous bands. This UL and DL rate adaptation has been viewed as a fundamental limitation for systems with FDD spectrum assignment, and our approach offers an efficient solution to this long standing problem.;Next, we propose novel pilot designs and a compensation scheme for millimeter-wave massive MIMO systems with severe RF distortions including phase noise and In-phase Quadrature (IQ) amplitude and phase imbalance at both transmitter and receiver sides.
机译：对数据速率的需求持续增长。数以万计的用户中的每一个都应支持每秒数十兆位的数据速率，这带来了自身的技术挑战。文献中最近提出的解决方案之一是使用许多天线元件，这种系统称为大规模多输入多输出（MIMO）系统。从理论和实践的角度来看，具有闭合形式的可达到的速率都是非常有用的。本文研究了在有和没有DL导频传输的情况下，在导频污染问题下大规模MIMO下行链路（DL）的封闭形式可达到的速率。我们还针对大规模MIMO的上行链路（UL）制定了可达到速率的性能范围。然后，我们为多小区大规模MIMO方案提出了一种新的信道估计器，其性能接近理想的最小均方误差（MMSE）信道估计器，但对信道长期统计的了解较少。另外，我们基于最大化总和速率来开发大规模MIMO的功率分配。然后，我们解决了大规模MIMO的主要挑战之一，该挑战以频分双工（FDD）模式工作。由于较大的导频开销，通常在文献中假定大规模MIMO在时分双工（TDD）模式下运行。但是，许多实际系统在不同的频带上以FDD模式工作。在本文中，我们提出了一种新的用于大规模MIMO的传输/收发器架构，称为旋转FDD（RFDD），它使大规模MIMO在非连续频带中工作。此外，我们开发和分析在非连续频带中工作时UL和DL之间的速率自适应机制。 UL和DL速率自适应已被视为具有FDD频谱分配系统的基本限制，我们的方法为解决这一长期存在的问题提供了有效的解决方案。接下来，我们提出了新颖的飞行员设计和毫米波质量补偿方案具有严重RF失真的MIMO系统，包括发射器和接收器侧的相位噪声和同相正交（IQ）幅度和相位不平衡。

著录项

  • 作者

    Khansefid, Amin.;

  • 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 2016
  • 页码 169 p.
  • 总页数 169
  • 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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