id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
american_scientific_journal-4375	Ge, Lijun; Li, Xiaoying; Wang, Xiaoxiao	Design of GMSK Frequency Hopping Modulation Scheme Based on FPGA	2018	11	.pdf	application/pdf	3946	143	46	Design Scheme of GMSK Frequency Hopping Modulation Normalizing the amplitude of GMSK modulated signal of equation (6) and obtaining the expression of the GMSK signal: cos[ ( ) ( )]GMSK cS t tω φ= + (8) The schematic diagram of GMSK frequency hopping modulation according to the above formula is shown in Figure 1. American Scientific Research Journal for Engineering, Technology, and Sciences (ASRJETS) (2018) Volume 47, No 1, pp 28-38 31 Signal Preprocess Filter Integrator Cosine Operation Frequency-hopping Carriers Generator Input d(n) na ( )tφ Output ctω ( )ct tω φ+ Figure 1: The schematic diagram of GMSK frequency hopping modulation The working process is that the user inputs the code elements of the sequence combination of {0, 1}, then the code elements is preprocessed to obtain the bipolar non-return to zero code na , next the preprocessed na is filtered by the Gaussian low-pass filter, and through the integrator obtains the accumulated phase )(tφ of the waveform.	cache/american_scientific_journal-4375.pdf	txt/american_scientific_journal-4375.txt