A multi-oscillator approach to CPFSK signal creation

The development of a MSK modulator/demodulator by Massey (1980) and the Hodgart and Schoones (see ibid p.211-216, 1992) implementation has prompted the development of a multi-oscillator multi-h modulator/demodulator. The approach taken has been an investigation and extension of basic CPFSK multi-oscillator modulator/demodulator design using digital logic. In this paper the multi-oscillator MSK modulator as developed by Massey is first re-examined before introducing the scheme developed by Crawford (see Master's thesis, Dept. Elec. Eng, University of Cape Town, Rondebosch, South Africa, June, 1993). Thereafter elements of the related digital logic demodulator design are discussed.