GMSK（高斯最小移頻鍵控）信號(hào)優(yōu)良的頻譜特性在跳頻通信中有廣闊的應(yīng)用前景。本文分析了GMSK 調(diào)制器的設(shè)計(jì)理論，給出了一種全數(shù)字實(shí)現(xiàn)結(jié)構(gòu)并在FPGA 上加以實(shí)現(xiàn)。仿真結(jié)果表明，這種數(shù)字實(shí)現(xiàn)結(jié)構(gòu)產(chǎn)生的GMSK 基帶信號(hào)具有良好的功率譜及眼圖，同時(shí)能夠有效避免I /Q兩條支路信號(hào)幅度及正交載波相位失衡。
【關(guān)鍵詞】GMSK；數(shù)字調(diào)制；數(shù)字實(shí)現(xiàn)；FPGA
【Abstract】GMSK is a spectrum-efficient modulation signal used widely in the FH communication system. In this paper, the design theory of GMSK modulator is analyzed and an improved digital implementation structure is obtained. Then this structure is implemented on FPGA. Simulation result show that GMSK signal generated by the digital implementation structure has nice PSD and eye pattern. Also, the effect of quadrature phase error and amplitude imbalance is avoided.
【Keywords】GMSK；Digital Modulation；Digital Implementation；FPGA