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A phase modulation system includes a phase mapping circuit (218) for mapping binary data into a plurality of discrete phase values in accordance with a predetermined phase modulation scheme. The discrete phase values are then filtered in the phase domain by a filter (220) to provide a filtered outpu

A phase modulation system includes a phase mapping circuit (218) for mapping binary data into a plurality of discrete phase values in accordance with a predetermined phase modulation scheme. The discrete phase values are then filtered in the phase domain by a filter (220) to provide a filtered output. This filtered output is then digitized and input to a numerically controlled oscillator for phase modulating a carrier.

대표청구항 ▼

A phase modulation system for phase modulating a carrier with digital data, comprising: means for receiving the digital data as a sequence of data bits at a predetermined bit rate; a phase mapper circuit for converting the received digital data to discrete phase values in accordance with a predeterm

A phase modulation system for phase modulating a carrier with digital data, comprising: means for receiving the digital data as a sequence of data bits at a predetermined bit rate; a phase mapper circuit for converting the received digital data to discrete phase values in accordance with a predetermined phase modulation scheme; phase domain filter means for cross-correlating a predetermined phase domain filter function with a predetermined number of discrete phase values about one current phase value, said one current phase value corresponding to one of said data bits, and said predetermined number of discrete phase values corresponding to a predetermined number of said data bits about one said data bit, said filter means outputting a filtered waveform in the phase domain of, said filtered waveform representing a continuous sequence in time of said discrete phase values; and phase modulation circuitry for generating a carrier at a predetermined carrier frequency and phase modulating said carrier in accordance with said filtered waveform that is output by said phase domain filter means.