Shown here is a comparison of the bandwidth occupancy for unfiltered
QPSK and Minimum Shift Keying. Both schemes have a
constant envelope property and thus are tolerant to TX/RX gain distortion. While MSK has a
slightly wider main lobe than QPSK, the side-lobe power falls off much more rapidly than
that for QPSK, making this system more attractive when adjacent
channel interference is an important design consideration.
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