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超宽带(UWB)通信通过传输能量极低的极短脉冲和占用超大带宽来完成短距离的高速通信。由于其极高的数据传输率,抗多径衰落,低成本和低功耗等诸多优点,成为短距离无线通信系统的研究热点。在有诸多优点的同时,它的实现又面临着很多挑战,比如系统采样率极高,对同步精度要求极高,信道估计极为复杂。而跳时延发射参考(DelayHopped Transmitted Reference—DHTR)系统是超宽带系统的一个低复杂度的实际可行的方案:通过在模拟域做相关操作,大大降低了系统的采样率和数字信号处理的数据量;把传输的参考脉冲作为信号脉冲的污损模板,绕过了复杂的信道估计问题。本文的工作是AIRLINK[4]项目演示任务的一部分。文中说明了DHTR UWB通信系统的工作原理;分析给出系统的框架结构;通过对文献[3]给出的接收信号数学模型进行简化,分析得到了同步解调的方法;并针对DHTR系统符号同步方法,提出了两种电路实现的结构—串行同步和并行同步结构;然后用FPGA实现了DHTR系统发射端和接收端的基带数字信号处理部分;最后搭建了一个完整的验证平台,对系统进行了功能验证。此系统的电路综合结果表明系统实现了低复杂度、低成本,证明了它在超宽带通信中的可行性和实用性。
Ultra-wideband (UWB) communications accomplish high-speed short-range communications by transmitting very short pulses of very low energy and occupying very large bandwidth. Due to its extremely high data transmission rate, anti-multipath fading, low cost and low power consumption, it has become a research hotspot in short-range wireless communication systems. While it has many advantages, its implementation faces many challenges. For example, the system sampling rate is extremely high, the synchronization accuracy is very high, and the channel estimation is extremely complicated. However, the DelayHopped Transmitted Reference-DHTR system is a low-complexity practical solution for UWB systems. By doing related operations in the analog domain, the system’s sampling rate and digital signal processing data are greatly reduced. The transmitted reference pulse is used as a decontamination template for signal pulses, bypassing the complex channel estimation problem. This article is part of the AIRLINK [4] project demonstration. The working principle of DHTR UWB communication system is described in this paper. The frame structure of the system is given. The mathematical model of received signal given in [3] is simplified and the method of synchronous demodulation is analyzed. In addition, Method, proposed two kinds of circuit realization structure - serial synchronization and parallel synchronization structure; and then use the FPGA to achieve the DHTR system transmitter and receiver baseband digital signal processing part; Finally, set up a complete verification platform for the system Functional Verification. The circuit synthesis results of this system show that the system achieves low complexity and low cost and proves its feasibility and practicability in ultra-wideband communication.