锁相环解调的Chirp-UWB接收机仿真研究  

Simulation and research of Chirp-UWB receiver based on PLL demodulation

作　　者：樊孝明[1] 林基明[1] 

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004

出　　处：《电子技术应用》2011年第5期121-125,共5页Application of Electronic Technique

基　　金：广西区自然基金(桂科自0640168;桂科自0991018Z);信息与通信技术广西重点实验室基金资助

摘　　要：Chirp_UWB通信系统使用Chirp信号实现数据传输,起到扩频的效果,具有抗衰落能力强、处理增益大、功率谱密度低、传输距离远等诸多特点,获得广泛研究与关注,而实现该系统的关键之一是如何以简便易行的解调方式来检测和恢复数据。据此,本文提出了一种采用锁相环解调的Chirp-UWB接收机方案,并用Simulink软件对其进行了建模与仿真。结果表明,该方法在信噪比为0 dB时可以稳定可靠地解调出码元数据,具有较强的抗噪声能力,且实现的电路具有成本低、灵活性强、应用价值高以及易于集成等优点。Chirp signal can be used to transfer the data symbols and achieve the effect of spread spectrum in Chirp_UWB communication system ,which has many characteristics such as strong anti-fading ability, a large processing gain, low power spec- tral density ,long transmission distance which gain extensive research and attention. One of the keys to realize the system is how to detect and recover data with easy demodulation method. Accordingly, Chirp-UWB receiver scheme using a phase locked loop demodulation is proposed, and is carried out modeling and simulation by using Simulink software.The results show that the symbol data can be demodulated reliably by using the method when SNR=0dB. Furthemore, it is low cost , highly flexible ,widely appli- cation value and easy to integrate.

关 键 词：超宽带 线性调频信号 PLL 包络检波器 

分 类 号：TN911.8[电子电信—通信与信息系统]