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A study of algorithms for single-user and multiuser detection in wireless communication systems.

机译：对无线通信系统中单用户和多用户检测算法的研究。

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摘要

This dissertation is focused on developing new algorithms for single-user and multiuser signal detection in wireless communications. Low complexity algorithms are of particular interest. Some focus is given to cases with multiple geometrically dispersed receivers where only a limited amount of data from each receiver will be sent to a central location called the fusion center.; First, we demonstrate the amount of information that should be transmitted from each receiver to the fusion center is limited by the amount of information transmitted from the other receivers. These results provide important guidelines for the optimum way to allocate a fixed overall number of bits across receivers.; Second, we analyze the performance of distributed receiver networks employing multiuser detection techniques. We show that distributed systems achieve near centralized performance using only one or two bit preliminary decisions. Moreover, distributed systems can be helpful in lessening the severity of the near-far problem when full multiuser detection is impractical.; Next, we propose a new iterative multiuser detection algorithm, the gradient guided search algorithm. This algorithm achieves near-optimum performance while its implementation complexity is linear in the number of active users. In addition, we find that the multiuser decorrelating detector is a good choice for the initialization of the proposed algorithm.; Finally, we present an approximate MMSE multiuser detection algorithm for DS-CDMA communications in slowly varying, flat Rayleigh fading channels. The performance of the approximate MMSE algorithm is shown to be very close to that of the exact MMSE detector so that it can be used as a tool for the performance analysis of the exact MMSE detector. The approximate algorithm also provides considerable complexity reduction.
机译：本文致力于无线通信中单用户和多用户信号检测的新算法的开发。低复杂度算法特别受关注。重点放在具有多个几何上分散的接收器的情况下，其中只有来自每个接收器的有限量的数据将被发送到称为融合中心的中心位置。首先，我们演示了应从每个接收器传输到融合中心的信息量受其他接收器传输的信息量的限制。这些结果为在接收机之间分配固定总数的最佳方法提供了重要的指导。其次，我们分析采用多用户检测技术的分布式接收器网络的性能。我们表明，仅使用一两个位的初步决策，分布式系统即可实现近乎集中的性能。此外，当无法进行全面的多用户检测时，分布式系统可以帮助减轻远距离问题的严重性。接下来，我们提出了一种新的迭代多用户检测算法，即梯度导引搜索算法。该算法实现了近乎最佳的性能，而其实现复杂度在活跃用户数量方面是线性的。此外，我们发现多用户解相关检测器是该算法初始化的不错选择。最后，我们提出了一种在缓慢变化的平坦瑞利衰落信道中用于DS-CDMA通信的近似MMSE多用户检测算法。结果表明，近似MMSE算法的性能与精确MMSE检测器的性能非常接近，因此它可以用作精确MMSE检测器性能分析的工具。近似算法还可以显着降低复杂度。

著录项

  • 作者

    Hu, Jun.;

  • 作者单位

    Lehigh University.;

  • 授予单位 Lehigh University.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 102 p.
  • 总页数 102
  • 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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