Noise performance of a new FM-DCSK communication system

With the development of Chaos Shift Keying, Frequency - Modulated Differential Shift keying(FM-DCSK) has gradually become the focus of scholars from various countries for its excellent performance. But, within a transmission cycle, FM-DCSK only half the time to send signals, the transmission efficiency is very low. In this paper, we present a new kind FM-DCSK communication system which based on the Walsh code. The studies have shown that, the efficiency of the new communication system is 4 times as the traditional FM-DCSK communication system. The bit error rate has a significant improvement compared to the traditional FM-DCSK communication system. The new system has value for application in the actual communication system.