Title :
Comments on spectral efficiency of VMSK
Author_Institution :
Fac. of Electr. Eng., Ljubljana Univ., Slovenia
fDate :
3/1/2002 12:00:00 AM
Abstract :
This article demonstrates 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, such as quadrature amplitude modulation (QAM), in transmission in the same frequency band.
Keywords :
minimum shift keying; quadrature amplitude modulation; spectral analysis; Nyquist´s criteria; QAM; UNBM method; UNBM methods; VMSK; VPSK; frequency band; quadrature amplitude modulation; sampling theorem; signal-to-noise ratio; spectral efficiency; ultra narrow band modulation; very minimum shift keying; Additive white noise; Amplitude modulation; Bandwidth; Digital modulation; Frequency conversion; Frequency shift keying; Internet; Narrowband; Propagation losses; Quadrature amplitude modulation;
Journal_Title :
Broadcasting, IEEE Transactions on
