中文摘要：

现代超宽带无线接收机的设计和实现要求在工作频率上有良好的线性度、宽动态范围、高灵敏度和强抗干扰能力。Chirp扩频（CSS）技术被IEEE 802.15.4A列为物理层标准之一,引起了广泛的关注。文中提出一种针对Chirp-OOK调制的锁相环（PLL）与自动增益控制（AGC）组合解调方案,在室内环境下实测Chirp超宽带通信系统发射信号频谱、解调波形,分析其传输特性。结果表明该解调方案具有电路复杂度低、体积小、成本低、接收灵敏度高及抗多径衰落能力强等优点,适用于高速率长距离通信。

英文摘要：

Nowadays the design and implementation of UWB wireless receivers is requires a working frequency of good linearity,wide dynamic range,high sensibility and strong anti-interference ability.In this paper,a novel demodulation scheme for Chirp-OOK modulation in combination of phase-locked loop（PLL） with automatic gain control（AGC） is proposed.The emission spectrum and demodulation waveforms of Chirp-UWB system are measured in indoor environment,and the transmission characteristics analyzed.Test results show that the proposed demodulation scheme has the advantages of low complexity,compact size,low cost,high receiving sensitivity,thus is robust against the multi-path fading and suitable for high-rate and long-distance communication.