Abstract
For the controlled spectral shaping of modulation methods similar to Minimum Shift Keying (MSK), Gaussian filtered Minimum Shift Keying (GMSK) and Tamed Frequency Modulation (TFM), three optimization approaches with different degrees of intersymbol interference and envelope fluctuations are discussed. For a frequency division multiplex transmission with a bitwise correlating receiver, a weighting function for the transmitter's power spectral density which is a good measure for the Bit Error Rate (BER) caused by Adjacent Channel Interference (ACI) is proposed. Its application to a separate or also joint optimization of the transmitter and the receiving filter reducing ACI power by roughly 20 dB is presented. For a given receiving filter, a compatible modulation that outperforms GMSK in both bandwidth and power efficiency can be designed.
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