中文摘要：

在通信系统优化的研究中,通信系统的质量优劣主要取决于接收机的性能。设计结构简单,复杂度低,可靠性高的Chirp-UWB接收机一直是系统实现的重点和难点。针对匹配滤波接收机解调Chirp-UWB系统成本高、灵活性不好等问题,设计了锁相环解调的Chirp-UWB接收机方案,调整锁相环参数使其工作在载波跟踪状态是方案的核心内容。研究了系统结构原理、各部分电路设计,通过Simulink软件进行建模和仿真,并对接收机系统进行性能分析。同时利用锁相环解调方案对发射机部分进行了进一步改进。从系统结构,误码率等方面将锁相环解调系统与匹配滤波解调系统进行了分析比较。仿真结果表明,改进锁相环解调Chirp-UWB系统电路成本低,灵活性好,抗干扰能力强,传输可靠性高。

英文摘要：

The quality of communication system mainly depends on the performance of receiver. Chirp - UWB re- ceiver with simple structure, low complexity and high reliability has been the emphasis and difficulty in system imple- mentation. Matched filter receiver system has problems of high cost and bad flexibility. In this paper, the Chirp - UWB receiver scheme using a phase locked loop demodulation was proposed. It is the core content of the plan to ad- just the parameter of phase lock loop to make it work in the carrier tracking status. The principle of system and each part of circuit was described in detail. Simulink software was used for the circuit simulation and performance analy- sis. The part of transmitter was improved based on phase - locked loop demodulation scheme. Phase - locked loop demodulation system was compared with matched filter receiver system from the system structure and the error rates. The simulation results show that phase - locked loop demodulation system has low cost, good flexibility, strong anti - interference ability and high transmission reliability.