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首页> 外文学位 >Full Diversity Full Multiplexing Beamforming Techniques for Multiple-Input Multiple-Output Wireless Communication Systems.
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Full Diversity Full Multiplexing Beamforming Techniques for Multiple-Input Multiple-Output Wireless Communication Systems.

机译：用于多输入多输出无线通信系统的全分集全复用波束成形技术。

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摘要

Multiple-Input Multiple-Output (MIMO) wireless systems have drawn substantial interest because they can offer high spectral efficiency and performance in a given bandwidth. Beamforming techniques have been applied to increase throughput or performance for flat fading channels, when Channel State Information at the Transmitter (CSIT) is available. Although uncoded multiple beamforming cannot offer full diversity, Bit-Interleaved Coded Multiple Beamforming (BICMB) applying channel coding can achieve both full diversity and full multiplexing if the code rate Rc and the number of employed subchannels S satisfy the condition RcS≤1. Moreover, by constellation precoding, both uncoded and coded beamforming can achieve full diversity and full multiplexing simultaneously for any RcS value with increased decoding complexity. In this dissertation, Perfect Coded Multiple Beamforming (PCMB) and BICMB with Perfect Coding (BICMB-PC) are proposed. They apply Perfect Space-Time Block Codes (PSTBCs) and achieve both full diversity and full multiplexing for uncoded and coded beamforming respectively. PCMB has substantially lower decoding complexity than a MIMO system employing PSTBC. Its decoding complexity is also much lower than fully precoded multiple beamforming in dimensions 2 and 4. BICMB-PC has much lower decoding complexity than BICMB with full precoding in these two dimensions, and the complexity gain is greater than the uncoded case.;MIMO techniques have been incorporated with Orthogonal Frequency Division Multiplexing (OFDM) for frequency selective fading channels. BICMB-OFDM can provide spatial diversity, multipath diversity, spatial multiplexing and frequency multiplexing simultaneously. In this dissertation, the diversity analysis of BICMB-OFDM is carried out, and a full diversity condition RcSL≤1 is proved, where S and L are the number of parallel streams at each subcarrier and the number of channel taps respectively. Furthermore, a full-diversity precoding design to overcome the restriction RcSL≤1 is developed with minimum decoding complexity.;Although precoding techniques can increase the performance of beamforming systems, their Maximum Likelihood (ML) decoding has high complexity. Sphere Decoding (SD) is an alternative for ML decoding with reduced complexity. Additionally, the complexity of SD can be further reduced. In this dissertation, a new technique is introduced for both uncoded and coded MIMO systems, which substantially decreases the computational complexity of SD.
机译：多输入多输出（MIMO）无线系统引起了人们的极大兴趣，因为它们可以在给定的带宽内提供高频谱效率和性能。当发射机（CSIT）的信道状态信息可用时，波束成形技术已被应用来提高吞吐量或平坦衰落信道的性能。尽管未编码的多波束成形不能提供全分集，但是如果编码率Rc和使用的子信道数S满足RcS≤1，则应用信道编码的比特交织编码多波束成形（BICMB）既可以实现全分集又可以实现全复用。此外，通过星座图预编码，未编码和编码波束成形都可以同时实现任何RcS值的完全分集和完全多路复用，同时增加了解码复杂度。本文提出了完美编码多波束成形（PCMB）和带有完美编码的BICMB（BICMB-PC）。它们应用完美的空时分组码（PSTBC），分别为未编码和编码波束成形实现全分集和全复用。与采用PSTBC的MIMO系统相比，PCMB的解码复杂度低得多。其解码复杂度也远低于维度2和4中的完全预编码多次波束成形。BICMB-PC的解码复杂度远低于在这两个维度上具有完全预编码的BICMB，并且复杂度增益大于未编码情况。已经与正交频分复用（OFDM）结合用于频率选择性衰落信道。 BICMB-OFDM可以同时提供空间分集，多径分集，空间复用和频率复用。本文对BICMB-OFDM进行了分集分析，证明了全分集条件RcSL≤1，其中S和L分别是每个子载波上并行流的数量和信道抽头的数量。此外，开发了一种克服了RcSL≤1限制的全分集预编码设计，并且具有最小的解码复杂度。尽管预编码技术可以提高波束成形系统的性能，但其最大似然（ML）解码具有很高的复杂度。球形解码（SD）是ML解码的另一种选择，具有降低的复杂性。另外，可以进一步降低SD的复杂度。本文针对未编码和已编码的MIMO系统引入了一种新的技术，该技术大大降低了SD的计算复杂度。

著录项

  • 作者

    Li, Boyu.;

  • 作者单位

    University of California, Irvine.;

  • 授予单位 University of California, Irvine.;
  • 学科 Speech Communication.;Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 164 p.
  • 总页数 164
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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