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Phase-shifting techniques for wireless multiple-antenna transmitter applications.

机译：无线多天线发射机应用中的相移技术。

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摘要

The wireless communications industry is experiencing explosive growth owing to the emergence of sub-micron CMOS technology in commercial analog and radio frequency integrated circuits. As the demand for data rates continue to increase, the multiple-antenna transceiver (MIMO) has become a technology of importance. By deploying antenna arrays at both the receiving and the transmitting ends, major impairments caused by the wireless channel can be mitigated, and signal-to-noise ratio and system capacity can be significantly increased.; One flavor of MIMO is the beamformer, which can optimize certain performance parameters (e.g., receiver SNR) to increase overall network capacity by dynamically adjusting receiver and/or transmitter array patterns. At the receiver, the beamformer gain in the direction of the desired transmitted signal (i.e., the look angle) is usually maximized while nulls are placed in the directions of strong interfering signals. At the transmitter, the beam-pattern of each antenna is dynamically adapted to maximize the overall gain in the direction of the desired receiver and to minimize interference at other receivers. Thus, a major advantage of a multiple-antenna transmitter is the reduction of multipath and interference effects without an attendant increase in the overall transmitted power compared to a single-antenna transmitter.; The capability of independently varying the phase of each transmit or receive path plays a key role in beamforming systems. Most previous RF- and LO-only phase shift implementations suffer from limited tuning range and a tradeoff between phase selector coarse granularity and output phase resolution, respectively. In this work, two novel techniques for beamforming transmitters that alleviate the aforementioned problems are presented.; The first approach achieves a 360° phase shift range by coarse-tuning using the LO and fine-tuning at RF. A 5.2GHz CMOS RF phase shifter based on a tunable all-pass filter is designed and fabricated. It achieves more than twice the phase shift range of previously published single-stage CMOS phase shifters, and offers competitive performance compared to its GaAs counterparts. Embedding the phase shifter in the signal path of a wireless beamforming transmitter and employing both RF and LO shifting provides a full 360° phase shift range. The second approach achieves a full phase shift range by Cartesian combining, with the phase-shifting and upconversion functions merged. A 5GHz phase-shifting modulator is fabricated in 0.18mum CMOS. Both techniques show promising potential for deployment in wireless beamforming transmitter applications due to their capabilities to achieve a 360° phase shift range with few limitations or drawbacks.
机译：由于亚微米CMOS技术在商业模拟和射频集成电路中的出现，无线通信行业正经历爆炸性增长。随着对数据速率的需求不断增加，多天线收发器（MIMO）已成为一项重要技术。通过在接收端和发射端都部署天线阵列，可以减轻无线信道造成的主要损害，并且可以显着提高信噪比和系统容量。 MIMO的一种形式是波束形成器，其可以优化某些性能参数（例如，接收器SNR），以通过动态地调整接收器和/或发射器阵列模式来增加整体网络容量。在接收机处，通常在期望的发射信号方向（即，视角）的波束形成器增益最大化，而在强干扰信号的方向上放置零点。在发射机处，动态调整每个天线的波束方向图，以使所需接收机方向上的总增益最大，并使其他接收机处的干扰最小。因此，与单天线发射机相比，多天线发射机的主要优点是减少了多径和干扰效应，而总发射功率却没有随之增加。在波束成形系统中，独立改变每个发送或接收路径的相位的能力起着关键作用。先前的大多数仅RF和仅LO的相移实现都受限于有限的调谐范围以及分别在相位选择器粗粒度和输出相位分辨率之间进行权衡。在这项工作中，提出了两种新颖的波束形成发射机技术，可以减轻上述问题。第一种方法是通过使用LO进行粗调并在RF上进行微调来实现360°相移范围。设计并制造了一个基于可调全通滤波器的5.2GHz CMOS RF相移器。它的相移范围是先前发布的单级CMOS相移器的两倍以上，并且与GaAs同类产品相比具有出色的性能。将移相器嵌入无线波束成形发射机的信号路径中，并同时采用RF和LO移相可提供完整的360°相移范围。第二种方法是通过笛卡尔组合实现完整的相移范围，并合并了相移和上变频功能。 5GHz相移调制器采用0.18μmCMOS制成。两种技术由于具有实现360°相移范围的能力而几乎没有局限性或缺点，因此在无线波束成形发射机应用中显示出了广阔的应用前景。

著录项

  • 作者

    Chu, Min.;

  • 作者单位

    University of Washington.;

  • 授予单位 University of Washington.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 105 p.
  • 总页数 105
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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