Transmission arrangement with power regulation
View Patent ↗In a transmission arrangement with power regulation, feedback from an output of a modulator to a digital signal processor is effected via a transmission power detector and an analog/digital converter. The digital signal processor processes baseband signals to be transmitted, and is coupled to the modulator in a transmission path. It is therefore possible to influence the baseband signal amplitudes and/or to program the gain of mixers in the modulator, based on the detected transmission power.
1. A transmission arrangement with power regulation, comprising:
a transmission path comprising a digital signal processor for the digital processing of a useful signal to be transmitted, a digital/analog converter, which is connected downstream of the digital signal processor, and a modulator, which is coupled to an output of the digital/analog converter, for modulating a carrier signal with the useful signal to be transmitted, and which provides a radio frequency transmission signal at an output thereof;
a power detector coupled to the output of the modulator;
an analog/digital converter having an input coupled to the power detector and having an output coupled to the digital signal processor; and
the modulator having a control input for setting the gain of the modulator, the control input coupled to the digital signal processor for permitting the amplitude of the radio frequency transmission signal to be influenced in a manner dependent on power measured by the power detector,
wherein the gain of the modulator is influenced by individual mixer cells, and wherein each of the mixer cells is, independently of the other mixer cells, connectable into and disconnectable from parallel combination with any of the other mixer cells.
2. The transmission arrangement as claimed in claim 1 , wherein the digital signal processor comprises a means for influencing the amplitude of the useful signal in a manner dependent on the power measured by the power detector.
3. The transmission arrangement as claimed in claim 2 , wherein the modulator comprises at least one mixer, having the control input for setting the gain.
4. The transmission arrangement as claimed in claim 1 , wherein the modulator comprises at least one mixer, having the control input for setting the gain.
5. The transmission arrangement as claimed in claim 4 , wherein the modulator is for processing complex-valued transmission signals, the modulator including a first mixer which is coupled to the digital signal processor via an in-phase branch, and a second mixer which is coupled to the digital signal processor via a quadrature branch, the modulator also including a summation element coupled to an output of the first mixer and an output of the second mixer and having an output that provides the radio frequency transmission signal.
6. The transmission arrangement as claimed in claim 1 , wherein the modulator is for processing complex-valued transmission signals, the modulator including a first mixer which is coupled to the digital signal processor via an in-phase branch, and a second mixer which is coupled to the digital signal processor via a quadrature branch, the modulator also including a summation element coupled to an output of the first mixer and an output of the second mixer and having an output that provides the radio frequency transmission signal.
7. The transmission arrangement as claimed in claim 6 , wherein the digital signal processor comprises a means for influencing the amplitude of the useful signal in a manner dependent on the power measured by the power detector.
8. The transmission arrangement as claimed in claim 7 , wherein the modulator comprises at least one mixer, having the control input for setting the gain.
9. The transmission arrangement as claimed in claim 1 , including a low-pass filter coupled between the digital/analog converter and the modulator.
10. The transmission arrangement as claimed in claim 1 , including a power amplifier coupled to the output of the modulator for amplifying the radio frequency transmission signal.
11. The transmission arrangement as claimed in claim 10 , wherein the power amplifier has a control input for receiving a constant control signal for controlling the gain of the power amplifier.
12. The transmission arrangement of claim 1 , where the influencing of the gain of the modulator is effected stepwise by the individual mixer cells.
13. A transmission arrangement with power regulation, comprising:
a transmission path comprising a digital signal processor for the digital processing of a useful signal to be transmitted, a digital/analog converter, which is connected downstream of the digital signal processor, and a modulator, which is coupled to an output of the digital/analog converter, for modulating a carrier signal with the useful signal to be transmitted, and which provides a radio frequency transmission signal at an output thereof;
a power detector coupled to the output of the modulator;
an analog/digital converter having an input coupled to the power detector and having an output coupled to the digital signal processor; and
the modulator having a control input for setting the gain of the modulator, the control input coupled to the digital signal processor for permitting the amplitude of the radio frequency transmission signal to be influenced in a manner dependent on power measured by the power detector,
wherein the modulator is for processing complex-valued transmission signals, the modulator including a first mixer which is coupled to the digital signal processor via an in-phase branch, and a second mixer which is coupled to the digital signal processor via a quadrature branch, the modulator also including a summation element coupled to an output of the first mixer and an output of the second mixer and having an output that provides the radio frequency transmission signal,
wherein the digital signal processor comprises a means for influencing the amplitude of the useful signal in a manner dependent on the power measured by the power detector,
wherein the modulator comprises at least one mixer, having the control input for setting the gain, and
wherein the modulator comprises a plurality of mixer cells, and wherein each of the mixer cells is, independently of the other mixer cells, connectable into and disconnectable from parallel combination with any of the other mixer cells in response to the control input of the modulator.
14. A transmission arrangement with power regulation, comprising:
a transmission path comprising a digital signal processor for the digital processing of a useful signal to be transmitted, a digital/analog converter, which is connected downstream of the digital signal processor, and a modulator, which is coupled to an output of the digital/analog converter, for modulating a carrier signal with the useful signal to be transmitted, and which provides a radio frequency transmission signal at an output thereof;
a power detector coupled to the output of the modulator;
an analog/digital converter having an input coupled to the power detector and having an output coupled to the digital signal processor; and
the modulator having a control input for setting the gain of the modulator, the control input coupled to the digital signal processor for permitting the amplitude of the radio frequency transmission signal to be influenced in a manner dependent on power measured by the power detector,
wherein the modulator comprises a plurality of mixer cells, and wherein each of the mixer cells is, independently of the other mixer cells, connectable into and disconnectable from parallel combination with any of the other mixer cells in response to the control input of the modulator.
15. The transmission arrangement as claimed in claim 14 , wherein the modulator is for processing complex-valued transmission signals, the modulator including a first mixer which is coupled to the digital signal processor via an in-phase branch, and a second mixer which is coupled to the digital signal processor via a quadrature branch, the modulator also including a summation element coupled to an output of the first mixer and an output of the second mixer and having an output that provides the radio frequency transmission signal.
16. The transmission arrangement as claimed in claim 15 , wherein the digital signal processor comprises a means for influencing the amplitude of the useful signal in a manner dependent on the power measured by the power detector.
17. The transmission arrangement as claimed in claim 15 , wherein the modulator comprises at least one mixer, having the control input for setting the gain.
18. The transmission arrangement as claimed in claim 14 , wherein the digital signal processor comprises a means for influencing the amplitude of the useful signal in a manner dependent on the power measured by the power detector.
19. The transmission arrangement as claimed in claim 14 , wherein the modulator comprises at least one mixer, having the control input for setting the gain.
20. The transmission arrangement as claimed in claim 19 , wherein the digital signal processor comprises a means for influencing the amplitude of the useful signal in a manner dependent on the power measured by the power detector.