Claims Versus Analysis
Walker claims that with VMSK, "Efficiencies up to 15 bits/sec/Hz are now being achieved in usable hardware with C/N ratios better than that obtainable using FM, BPSK or QPSK."
Analysis by third parties have concluded that "no ultra narrow band modulation (UNBM) method, which includes very minimum shift keying (VMSK) and VPSK, can have substantially greater efficiency than conventional methods."
Read more about this topic: Very Minimum-shift Keying
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