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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。
The design and implementation of modern ultra-wideband wireless receivers require good linearity, wide dynamic range, high sensitivity and strong anti-interference ability at operating frequency. Chirp spread spectrum (CSS) technology was IEEE802.15.4A listed as one of the physical layer standards, aroused widespread concern. In this paper, a demodulation scheme based on Chirp-OOK modulation combining with phase-locked loop (PLL) and automatic gain control (AGC) is proposed. The spectrum and demodulation waveform of Chirp UWB communication system are measured in indoor environment and the transmission characteristics . The results show that the demodulation scheme has the advantages of low complexity, small size, low cost, high receiving sensitivity and anti-multipath fading ability, which is suitable for high-speed long-distance communication.