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PROCÉDÉ DE MISE EN OEUVRE DE NUMÉRISATION DE MODULATION CPM BASÉ SUR UN PROCÉDÉ DE CONSULTATION DE TABLE, ET MODULE DE MODULATION CPM NUMÉRIQUE
PROCÉDÉ DE MISE EN OEUVRE DE NUMÉRISATION DE MODULATION CPM BASÉ SUR UN PROCÉDÉ DE CONSULTATION DE TABLE, ET MODULE DE MODULATION CPM NUMÉRIQUE
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摘要
The present invention relates to a CPM modulation digitization implementation method based on a table lookup method, and a digital CPM modulation module. The method comprises: (1) an instantaneous phase of a CPM baseband modulation signal being composed of two parts, namely, a correlation phase and an accumulation phase, pre-storing correlation phase information in a phase table, and obtaining the correlation phase of the signal by looking up the phase table; (2) an accumulator performing continuous accumulation on phase increments so as to obtain the accumulation phase; (3) adding the correlation phase and the accumulation phase, so that the instantaneous phase of the CPM baseband modulation signal can be obtained; and (4) obtaining the CPM baseband modulation signal by looking up a sine table and a cosine table according to the phase information about the CPM modulation signal. The method is simple in implementation, low in complexity and wide in suitable range, and the established phase table is associated with a sampling time, thereby ensuring the continuity of a CPM modulation phase, having a higher implementation precision and facilitating the adoption of coherent demodulation by a receiver.
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