Low-complexity multiuser detectors for time-hopping impulse-radio systems
Low-complexity multiuser detectors for time-hopping impulse-radio systems
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DOI：
10.1109/tsp.2004.832017
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发表时间：
2004-09
影响因子：
5.4
通讯作者：
E. Fishler;H. Poor
中科院分区：
文献类型：
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作者：
E. Fishler;H. Poor
自20世纪90年代初在超宽带（UWB）系统的背景下引入脉冲无线电（IR）系统，特别是跳时IR（TH-IR）系统以来，它们吸引了相当多的关注。最近，随着美国联邦通信委员会的行动允许UWB无线电系统的广泛使用，对这些系统的兴趣进一步增长。这些系统承诺以非常简单的发射机和接收机设计在多址通信信道中提供高数据速率。多用户检测的重要性，实现高数据速率与这些系统已经建立了几项研究。本文研究了几种专门为TH-IR无线电系统设计的低复杂度多用户检测器。它表明，许多多用户检测器主要用于直接序列码分多址（DS-CDMA）系统，可以使用基本上没有任何变化的TH-IR接收机。此外，开发了几种新颖的，低复杂度的多用户检测器，利用TH-IR系统用于传输的特殊信号结构。这些新的检测器进行了理论分析和模拟。结果表明，一个非常简单的迭代多用户检测器产生的性能是类似于一个单用户系统。
Impulse radio (IR) and especially time-hopping IR (TH-IR) systems have attracted considerable attention since their introduction in the context of ultra wide-band (UWB) systems in the early 1990s. Recently, with the U.S. Federal Communications Commission actions allowing for the wide-spread use of UWB radio systems, the interest in these systems has grown further. These systems promise to deliver high data rates in multiple access communication channels with very simple transmitter and receiver designs. The importance of multiuser detection for achieving high data rates with these systems has already been established in several studies. This paper studies several low-complexity multiuser detectors specifically designed for TH-IR radio systems. It is demonstrated that many multiuser detectors developed primarily for direct-sequence code division multiple access (DS-CDMA) systems can be used essentially without any change in TH-IR receivers. Further, several novel, low-complexity multiuser detectors that exploit the special signal structure used for transmission by TH-IR systems are developed. These novel detectors are analyzed both theoretically and via simulations. It is shown that a very simple iterative multiuser detector yields performance that is similar to that of a single-user system.