基于DCR标准调制解调器的设计与仿真

Design and Simulation of Modulation and Demodulation Module Based on DCR Standards

在专业无线通信领域,数字集群对讲机是最重要的通信方式。本文针对日本的数字对讲机标准DCR,研究了4FSK调制解调系统中基带信号处理的几项关键技术,主要包括均方根余弦滚降滤波器、Isinc滤波器和帧同步检测器的设计方法,给出了相应的仿真结果,分析了整个系统的误码率,仿真结果表明系统误码率接近理论值,可以满足DCR标准的要求。

In the special wireless communications field,digital trunking interphone is the most important means of communication. In this paper, the several key technologies of baseband signal processing are studied in 4FSK modulation and demodulation module based on the Japanese DCR standard. The work includes the design methods of square-root raised cosine FIR filter, inversed sinc （ Isinc ） filter and frame sync detector. The corresponding simulation results are given and the bit error rate（ BER） of the entire system modules is analyzed. The simulation results show that the bit error rate of the system is close to the theoretical value,and able to meet the demand of DCR standards.