The Development Of Gmsk Modulation Frequency-hopping Source

The subject stems from Sine Science and Technologies Co., Ltd. University of Electronic Scince and Technology of China.A large number of data and video information which produced by data terminal and pronunciation information need to transmit in modern communication system. An adapting modulation scheme which behave spectral energy centralized, frequency spectrum narrow become very important. During the process of transmitting the data, there is a large amount of jumming, frequency hopping technology is an anti-jumming method to frequency hopping. In this way, study, utilize, modulating + jumping technology in transmitting high-speed data become meaningful. Because high-speed data take up wide bandwidth, looking for one which have high efficiency modulation scheme and suitable for frequency hopping communication system is needed. The subject realizes frequency hopping technology and GMSK modulation, and realizes communication rate 192kbit/s.This dissertation has dipicted the synthesizer and analyzed synthesizer operating principle and noise performance, recommens modulating technology. In this dissertation, Key analysis two_point modulation in GMSK modulation, and modulate simulation to GMSK. The contrasting between practical spectrum and simulation confirms systematic function of the scheme is correct.This dissertation narrates the systematic design process in detail, the verification process of the systematic index, some question that appear in the process of realizing actually, the method of avoiding and solving these problem. The detailed analytic process and function simulation is provided at the same time, The process realized and the data picture of testing provided finally.