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Assigneekoninklijke phillips electronics n.c.
InventorsAlexander Lampe, Rainer Dietsch
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Modulator system (1) comprising modulators (2, 3, 4) for modulating input signals (A) according to different modulation schemes (8PSK, GMSK) cause discontinuities in the output signals (F) when switching between the schemes. By providing the modulator systems (1) with compensators (13, 22-26) for compensating amplitudes/phases of the output signals (F) of the modulator system (1) for discontinuities, these discontinuities resulting from modulation scheme changes are reduced to a large extent. This may be done before/after the pulse shapers (11, 21). The compensators (13, 22-26) comprise multipliers for multiplying pulse shaped modulated signals with complex valued waveforms (E), or for multiplying modulated signals with waveforms (S, T), or for multiplying complex valued signals (B, C, D) with complex valued phase offsets (X, Y, Z), which complex valued signals (B, C, D) are to be multiplied with mapped input signals. As a result, the output signals (F) and/or power amplifiers (33) situated after the modulator system (1) no longer need to be ramped down.
Modulator system comprising a first modulator for modulating an input signal according to a first modulation scheme and a second modulator for modulating the input signal according to a second modulation scheme, which modulator system comprises a compensator for combining at least one modulator signal with at least one waveform for compensating at least one signal parameter of an output signal for discontinuities resulting from a modulation scheme change.
Transmitter comprising a modulator system comprising a first modulator for modulating an input signal according to a first modulation scheme and a second modulator for modulating the input signal according to a second modulation scheme, which modulator system comprises a compensator for combining at least one modulator signal with at least one waveform for compensating at least one signal parameter of an output signal for discontinuities resulting from a modulation scheme change, which transmitter further comprises a power amplifier for amplifying the output signal.
Modulator for modulating an input signal according to a modulation scheme, which modulator comprises a compensator for combining at least one modulator signal with at least one waveform for compensating at least one signal parameter of an output signal for discontinuities resulting from a modulation scheme change.
Method for modulating an input signal according to a first modulation scheme and for modulating the input signal according to a second modulation scheme, which method comprises a step of combining at least one modulator signal with at least one waveform for compensating at least one signal parameter of an output signal for discontinuities resulting from a modulation scheme change.
Processor program product for modulating an input signal according to a first modulation scheme and for modulating the input signal according to a second modulation scheme, which processor program product comprises a function of combining at least one modulator signal with at least one waveform for compensating at least one signal parameter of an output signal for discontinuities resulting from a modulation scheme change.
Dependencies are inferred from the claim text.