GMSK（高斯最小移頻鍵控）信號優(yōu)良的頻譜特性在跳頻通信中有廣闊的應用前景。本文分析了GMSK 調(diào)制器的設計理論，給出了一種全數(shù)字實現(xiàn)結(jié)構(gòu)并在FPGA 上加以實現(xiàn)。仿真結(jié)果表明，這種數(shù)字實現(xiàn)結(jié)構(gòu)產(chǎn)生的GMSK 基帶信號具有良好的功率譜及眼圖，同時能夠有效避免I /Q兩條支路信號幅度及正交載波相位失衡。
【關鍵詞】GMSK；數(shù)字調(diào)制；數(shù)字實現(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