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Phase noise effects on OFDM: Analysis and mitigation.

机译：相位噪声对OFDM的影响：分析和缓解。

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摘要

Orthogonal frequency division multiplexing (OFDM) is a promising technique which has high spectrum efficiency and the robustness against channel frequency selectivity. One drawback of OFDM is its sensitivity to phase noise. It has been shown that even small phase noise leads to significant performance loss of OFDM. Therefore, phase noise effects on OFDM systems need to be analyzed and methods be provided to its mitigation.; Motivated by what have been proposed in the literature, the exact signal to interference plus noise ratio (SINR) is derived in this dissertation for arbitrary phase noise levels. In a multiple access environment with multiple phase noise, the closed form of bit error rate (BER) performance is derived as a function of phase noise parameters.; Due to the detrimental effects of phase noise on OFDM, phase noise mitigation is quite necessary. Several schemes are proposed to mitigate both single and multiple phase noise. It is shown that, while outperforming conventional methods, these schemes have the performance close to no-phase-noise case. Two general approaches are presented which extend the conventional schemes proposed in the literature, making them special cases of these general approaches. Moreover, different implementation techniques are also presented. Analytical and numerical results are provided to compare the performance of these mitigation approaches and implementation techniques.; Similar to OFDM, an OFDM system with multiple antennas, i.e., Multiple Input Multiple Output (MIMO)-OFDM, also suffer severe performance degradation due to phase noise, and what have been proposed in the literature may not be applicable to MIMO-OFDM. Therefore, a new scheme is proposed to mitigate phase noise for MIMO-OFDM, which provides significant performance gains over systems without phase noise mitigation. This scheme provides a very simple structure and achieves adequate performance with high spectrum efficiency, which makes it very attractive for practical implementations.
机译：正交频分复用（OFDM）是一种有前途的技术，它具有高频谱效率和针对信道频率选择性的鲁棒性。 OFDM的一个缺点是它对相位噪声的敏感性。已经表明，即使很小的相位噪声也会导致OFDM的显着性能损失。因此，需要分析对OFDM系统的相位噪声影响，并提供减轻其影响的方法。根据文献中的建议，本文针对任意相位噪声水平推导了精确的信噪比加噪声比（SINR）。在具有多个相位噪声的多址环境中，误码率（BER）性能的封闭形式是相位噪声参数的函数。由于相位噪声对OFDM的有害影响，减轻相位噪声非常必要。提出了几种方案来减轻单相和多相噪声。结果表明，尽管这些方案的性能优于传统方法，但其性能却接近无相位噪声的情况。提出了两种通用方法，它们扩展了文献中提出的常规方案，使其成为这些通用方法的特殊情况。此外，还提出了不同的实现技术。提供了分析和数值结果，以比较这些缓解方法和实施技术的性能。与OFDM类似，具有多个天线的OFDM系统（即，多输入多输出（MIMO）-OFDM）也由于相位噪声而遭受严重的性能劣化，并且文献中提出的内容可能不适用于MIMO-OFDM。因此，提出了一种新的方案来减轻MIMO-OFDM的相位噪声，该方案在不降低相位噪声的系统上提供了显着的性能增益。该方案提供了非常简单的结构，并以高频谱效率实现了足够的性能，这使其在实际实现中非常具有吸引力。

著录项

  • 作者

    Wu, Songping.;

  • 作者单位

    New Jersey Institute of Technology.;

  • 授予单位 New Jersey Institute of Technology.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 108 p.
  • 总页数 108
  • 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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