Combined frequency and phase-shift keying

Combined frequency and phase-shift keying

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In previous letters, the constraints necessary for the elimination of i.s.i. in both binary and multilevel f.s.k. were discussed. It is now shown that a system with simultaneous phase and frequency modulation is possible, both modulations being detected with zero i.s.i. In terms of energy per bit required at the receiver input for a given error rate, a 4-phase 2-frequency system is shown to be superior to an equivalent 8-state multiphase or combined phase/amplitude system.


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      • K.W. Cattermole . Digital transmission by frequency-shift keying with zero intersymbol interference. Electron. Lett. , 349 - 350
    2. 2)
      • M.J. O'mahony , K.W. Cattermole . Distortionless frequency-shift keying: further results. Electron. Lett. , 605 - 606
    3. 3)
      • E.D. Sunde . Ideal pulse transmission by A.M. and F.M.. Bell Syst. Tech. J. , 1357 - 1425
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      • C.R. Cahn . Combined digital phase and amplitude modulation communication systems. IRE Trans. , 150 - 155
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      • J.C. Hancock , R.W. Lucky . Performance of combined amplitude and phase-modulated communication systems. IRE Trans. , 232 - 237

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