Digital gmsk modulator with non-integer bit interval handling

Details Digital gmsk modulator with non-integer bit interval handling Digital gmsk modulator with non-integer bit interval handling

H - Electricity

03

K

332/32

H03K 7/00 (2006.01) H04L 27/20 (2006.01)

Patent

CA 2000475

Abstract of the Invention A modulation circuit is used in a GMSK modulation system. The system includes I-channel (210) and Q-channel (212) ROM look-up tables, each proprogrammed for generating a representative digital waveform based on an input data stream (250) and a clock signal (252). Each digital waveform is converted to an analog signal for subsequent radio frequency (RF) modulation. Each ROM is addressed by an interpolation counter (224) controlled by a clock signal (252), by a data shift register (226) receiving input data (250) at a rate corresponding to the clock signal, and by a quadrant register (230), also receiving the input data, for specifying the phase of the data signal with respect to the clock signal. Additionally, a signal (242) indicating the arrival of a non-integer bit interval is provided. In response to this signal, ROM addressing is updated in order to provide control of the modulated carrier's phase angle.

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