Design and Simulation of Modulation and Demodulation Module Based on DCR Standards
LI Yu-fen · Dianzi qijian · 2014
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.