Alternatively, the transmitter can be simulated and the spectra can be calculated from the waveform. The next step is to spline interpolate between spectral peaks to establish the spectral envelope. Spectral analysis of modulations flowchart. A transmitter block diagram and analysis results for GMSK are shown in Figures 2-5. The one-sided linear power spectrum of the transmitter output is shown in Figure 3, demonstrating the effect of the Gaussian filtering on the input data stream.
All bandwidths are one-sided and normalized to the symbol duration.
This is shown in Figure 5. GMSK linear power spectrum. GMSK log power spectrum. GMSK total power within a bandwidth.