QPSK vs MSK
This page covers comparison between QPSK and MSK modulation techniques with respect to various system parameters. Following table covers difference between QPSK and MSK.
Specifications | QPSK modulation | MSK modulation |
---|---|---|
Full form | Quadrature Phase Shift Keying | Minimum Shift Keying |
Maximum phase change | +/-90 , +/-180 degrees | phase change of +/-90 degree smoothly over course of a bit period |
RF Amplifier requirement | requires linear amplifier. nonlinear amplifier if used will result into spectral regrowth due to +/-180 phase transition | phase change is linear and hence allows use of nonlinear amplifier |
Null Bandwidth | equal to 1.0 times data rate | equal to 1.5 times data rate |
Power | 99% power is concentrated in 1.0(data rate) | 99% power is concentrated in 1.2(data rate) |
PSD(Power Spectral Density) | PSD falls off proportional to inverse second power of frequency | PSD falls off proportional to inverse fourth power of frequency |
Amplitude variation | on the order of 30dB | very less |
mainlobe to sidelobe suppression | poor | is very high. Side lobes are much smaller compare to main lobe and hence filtering of MSK modulated signal is easier. |
width of main lobe | 1.0 times data rate | main lobe is wider than QPSK i.e. 1.5 times data rate |
definition | two BPSK in phase quadrature | two BPSK signals are orthogonal to one another in frequency quadrature |
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