| 摘要 |
PURPOSE:To facilitate the application of viterbi algorithm to a demodulating method by making binary input data information correspond to the phase state of a modulated waveform in 1:1 proportion by making its transition into a multiple Markov chain. CONSTITUTION:A binary input data signal is converted into an l-multiple Markov chain on a transmission line and initial phase states of modulated waveforms are made to correspond to the 2<l> obtained states in 1:1 proportion; and the extent of the frequency shift of each time slot is controlled according to the transition of the input signal so that the phase varies continuously between adjacent time slots. Consequently, error rate characteristics and converging characteristics of an electric power spectrum are both improved and even when an optional modulation index is selected, the number of phase states of modulated waveforms is constant invariably. Further, pieces of information on l elements preceding the initial phase state are obtained, so viterbi algorith is applied easily to a demodulating method. |
