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Noncoherent ultra-wideband systems

机译：非相干超宽带系统

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摘要

The need for low-complexity devices with low-power consumption motivates the application of suboptimal noncoherent ultra-wideband (UWB) receivers. This article provides an overview of the state of the art of recent research activities in this field. It introduces energy detection and autocorrelation receiver front ends with a focus on architectures that perform the initial signal processing tasks in the analog domain, such that the receiver does not need to sample the UWB received signals at Nyquist rate. Common signaling and multiple access schemes are reviewed for both front ends. An elaborate section illustrates various performance tradeoffs to highlight preferred system choices. Practical issues are discussed, including, for low-data-rate schemes, the allowed power allocation per pulse according to the regulator's ruling and the estimated power consumption of a receiver chip. A large part is devoted to signal processing steps needed in a digital receiver. It starts with synchronization and time-of-arrival estimation schemes, introduces studies about the narrowband interference problem, and describes solutions for high-data-rate and multiple access communications. Drastic advantages concerning complexity and robustness justify the application of noncoherent UWB systems, particularly for low-data-rate systems.
机译：对具有低功耗的低复杂度设备的需求推动了次优非相干超宽带（UWB）接收机的应用。本文概述了该领域中最新研究活动的最新状态。它介绍了能量检测和自相关接收器前端，重点介绍了在模拟域中执行初始信号处理任务的体系结构，从而使接收器无需以奈奎斯特速率对UWB接收信号进行采样。审查了两个前端的通用信令和多址方案。详尽的部分说明了各种性能折衷，以突出显示首选的系统选择。讨论了实际问题，包括对于低数据速率方案，根据调节器的规定以及接收器芯片的估计功耗，允许每个脉冲分配功率。很大一部分致力于数字接收机中所需的信号处理步骤。它从同步和到达时间估计方案开始，介绍有关窄带干扰问题的研究，并描述高数据速率和多址通信的解决方案。有关复杂性和鲁棒性的巨大优势证明了非相干UWB系统的应用是合理的，特别是对于低数据速率系统。

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