本文介绍了一种使用低调制指数数字FSK和高调制指数模拟FM创建恒包络UWB信号的创新UWB通信系统。该系统旨在服务于低至中等比特率（1-10kbps和100-1000kbps）的短距离WPAN系统。通过子载波级的FDMA技术实现多用户共享频谱。关键组件是不带限幅放大器的宽带延迟线FM解调器，允许多个用户在同一RF带宽内共存。然而，多径传播可能限制可用的子载波带宽至一个八度。文章探讨了在AWGN和多径条件下的性能，抗窄带干扰能力，以及在同一载波频率上同时检测多个FM信号。通过SPICE和Matlab仿真结果展示了该新技术的原理和局限性，并已实现硬件演示验证了理论与实践的一致性。
摘要：
p/ pThis paper presents a novel UWB communications system using double FM: a low-modulation index digital FSK followed by a high-modulation index analog FM to create a constant-envelope UWB signal. FDMA techniques at the subcarrier level are exploited to accommodate multiple users. The system is intended for low (1#8211;10 kbps) and medium (100#8211;1000 kbps) bit rate, and short-range WPAN systems. A wideband delay-line FM demodulator that is not preceded by any limiting amplifier constitutes the key component of the UWBFM receiver. This unusual approach permits multiple users to share the same RF bandwidth. Multipath, however, may limit the useful subcarrier bandwidth to one octave. This paper addresses the performance with AWGN and multipath, the resistance to narrowband interference, as well as the simultaneous detection of multiple FM signals at the same carrier frequency. SPICE and Matlab simulation results illustrate the principles and limitations of this new technology. A hardware demonstrator has been realized and has allowed the confirmation of theory with practical results./p
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