Digital modulator
View Patent ↗The application relates to a digital modulator comprising at least one input terminal configured to receive at least one signal, at least one symbol generating unit comprising a first output terminal and at least a second output terminal, wherein the symbol generating unit is configured to generate a first symbol waveform for the first output terminal depending on the received signal, and wherein the symbol generating unit is configured to generate at least a second symbol waveform for the second output terminal depending on the received signal, wherein the first symbol waveform comprises at least one different parameter value compared to the second symbol waveform, at least one third output terminal connectable to at least the first output terminal and/or second output terminal via a switching unit, a controlling unit configured to control the switching unit depending on the received signal such that a modulated output signal is generated.
1. A digital modulator, comprising:
at least one input terminal configured to receive at least one signal,
a symbol generating unit comprising a first output terminal and at least a second output terminal,
wherein the symbol generating unit is configured to generate a first symbol waveform for the first output terminal depending on the received signal, and
wherein the symbol generating unit is configured to generate at least a second symbol waveform for the second output terminal depending on the received signal,
wherein the first symbol waveform comprises at least one different parameter value compared to the second symbol waveform,
at least one third output terminal connectable to at least one of the first output terminal and the second output terminal via a switching unit,
a controlling unit configured to control the switching unit depending on the received signal such that a modulated output signal is generated, and
a sequence controlling unit configured to control the sequence of communication establishing of the switching unit depending on at least one of the current received signal and the next received signal to smooth a transition from one duty cycle or phase to a next duty cycle or phase by first closing the switching unit with a small coarse duty cycle waveform and next closing the switching unit with a large coarse duty cycle.
2. The digital modulator according to claim 1 , wherein the received signal is a first quantized signal depending on at least one of:
an envelope component being transmitted,
a phase component being transmitted.
3. The digital modulator according to claim 2 , further comprising a converting unit configured to convert at least one of the received first quantized envelope component and the phase component into a second quantized signal comprising the parameter value.
4. The digital modulator according to claim 1 , wherein the parameter value is at least one of:
a duty cycle, and
a phase.
5. The digital modulator according to claim 1 , wherein the symbol generating unit is configured to generate
the first symbol waveform comprising a higher parameter value than the modulated output signal, and
the second symbol waveform comprising a lower parameter value than the modulated output signal.
6. The digital modulator according to claim 1 , wherein the symbol generating unit is configured to generate:
a pulse width modulated symbol waveform, and
a pulse position modulated symbol waveform.
7. The digital modulator according to claim 1 , further comprising
a clock generator configured to generate a first clock signal,
wherein the first clock signal depends at least on the dynamic range of the digital modulator.
8. The digital modulator according to claim 7 , wherein at least the symbol generating unit is configured to be controllable depending on the first clock signal.
9. The digital modulator according to claim 7 , further comprising a first dividing unit configured to generate a second clock signal depending on the first clock signal and a first dividing factor.
10. The digital modulator according to claim 9 , wherein at least the controlling unit is configured to be controllable depending on the second clock signal.
11. The digital modulator according to claim 9 , further comprising a second dividing unit configured to generate a third clock signal depending on the second clock signal and a second dividing factor.
12. The digital modulator according to claim 11 , wherein at least one delay unit is configured to be controllable depending on the third clock signal.
13. The digital modulator according to claim 1 , wherein the symbol generating unit comprises at least one symbol table provided for determining at least one of the first symbol waveform and the second symbol waveform depending on the received signal.
14. The digital modulator according to claim 13 , wherein the at least one symbol table is provided for determining at least one of the first symbol waveform and the second symbol waveform depending on at least one most significant bit of the received signal.
15. The digital modulator according to claim 1 , wherein the controlling unit is configured to control the switching unit depending on at least one least significant bit of the received signal.
16. The digital modulator according to claim 1 , wherein the controlling unit is formed as a sigma delta modulator.
17. The digital modulator according to claim 1 , further comprising
a power controlling unit,
wherein the power controlling unit is configured to control the selection of at least two generating units.
18. A transmitter comprising a digital modulator according to claim 1 .
19. The transmitter according to claim 18 , further comprising at least one amplifying unit.
20. The transmitter according to claim 18 , wherein the transmitter is formed as a switched linear amplification with non-linear components transmitter.
21. A method for generating a modulated output signal, comprising:
receiving at least one signal,
generating a first symbol waveform depending on the received signal,
generating at least a second symbol waveform depending on the received signal,
wherein the first symbol waveform comprises at least one different parameter value compared to the symbol second waveform,
generating the modulated output signal by switching a third output terminal to at least the first symbol waveform and/or the second symbol waveform,
wherein switching is controlled depending on the received signal, and
controlling the sequence of communication establishing of the switching depending on at least one of the current received signal and the next received signal to smooth a transition from one duty cycle or phase to a next duty cycle or phase by first switching with a small coarse duty cycle waveform and next switching with a large coarse duty cycle.
22. A non-transitory computer readable medium having a computer program stored thereon, the computer program comprising:
instructions operable to cause a processor to perform the method according to claim 21 .