论文标题
多次访问和移动性的时间逆转：算法设计和实验结果
Time Reversal for Multiple Access and Mobility: Algorithmic Design and Experimental Results
论文作者
论文摘要
时间逆转（TR）已被提议作为依靠超宽带（UWB）信号波形的低复杂性无线设备的竞争预编码策略。但是，当将TR应用于多个访问时，多个用户收到的信号遭受了符号间和用户间干扰的大量级别，这需要每个接收用户进行额外的缓解处理。在本文中，我们提出了一种迭代的时间反转多访问（TRDMA）方法，旨在使后者干扰水平变暗。迭代TRDMA的性能在模仿丰富的室内无线传播环境的混响室中进行实验评估。与常规TRDMA相比，就算法迭代的数量而言，提高效率的提高。我们还考虑一种移动用户配置，其中接收器的位置在通道估计和数据传输步骤之间发生变化。即使对于这种实验设置，也证明了所提出的迭代TRDMA方法比常规的预编码方案更有效。
Time Reversal (TR) has been proposed as a competitive precoding strategy for low-complexity wireless devices relying on Ultra-WideBand (UWB) signal waveforms. However, when TR is applied for multiple access, the signals received by the multiple users suffer from significant levels of inter-symbol and inter-user interference, which requires additional processing for mitigation by each receiving user. In this paper, we present an iterative Time-Reversal Division Multiple Access (TRDMA) approach that aims to dim the latter interference levels. The performance of iterative TRDMA is evaluated experimentally in a reverberation chamber that mimics a rich scattering indoor wireless propagation environment. The improved efficiency, in terms of the number of algorithmic iterations, of the proposed approach compared to conventional TRDMA, is demonstrated. We also consider a mobile user configuration, where the position of the receiver changes between the channel estimation and data transmission steps. It is showcased, even for this experimental setup, that the proposed iterative TRDMA approach is more efficient than conventional precoding schemes.
