Everything about Minimum-shift Keying totally explained
Minimum-shift keying (MSK) is a type of
continuous phase frequency-shift keying.
Similarly to
OQPSK, MSK is encoded with bits alternating between quarternary components, with the Q component delayed by half the
symbol period. However, instead of square pulses as OQPSK uses, MSK encodes each bit as a half
sinusoid. This results in a constant-modulus signal, which reduces problems caused by non-linear distortion.
The resulting signal is represented by the formula
is 1, and
otherwise. Therefore, the signal is modulated in frequency and phase, and the phase continuously and linearly changes.
A similar modulation scheme is
Gaussian minimum-shift keying, which uses Gaussian instead of sinusoidal pulse shapes.
MSK, a proven and widely used technique, shouldn't be confused with the completely unworkable
Very minimum-shift keying (VMSK).
Further Information
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