Digital comm. 11: MSK and GMSK

In this lecture, we explore cont. phase modulation techniques, in particular MSK and GMSK. We discuss CPFSK modulation and then show that MSK can be thought of as sinusoidal pulse-shaped OQPSK. From that fact, we proceed to analyze the PSD, constellation, and probability of error of MSK. Finally, we discuss GMSK, in particular the ISI vs. spectral compactness tradeoff.