Coded and uncoded CPM schemes over rings of integers for AWGN and Rayleighfading channels

Coded and uncoded modulation schemes based on continuous phase modulation ( CPM) over rings of integers are investigated. A baseband modulator utilisin g a decomposed model of CPM is used at the transmitter and a Viterbi soft-d ecision decoder is employed at the receiver. The performances of a number o f partial-response CPM schemes are investigated when operating over an addi tive white Gaussian noise (AWGN) channel and Rayleigh flat fading (RFF) cha nnel. The simulation results obtained are shown to compare favourably with theoretical bounds.