Technique for Generating a Radio Frequency Signal Based on a Peak or an Offset Compensation Signal
First Claim
1. A method of generating a radio frequency signal based on a baseband signal, the method comprising:
- modifying the baseband signal by adding an offset signal to the baseband signal, the offset signal being configured to prevent the modified baseband signal from entering a first signal region;
providing an amplitude signal and a phase signal based on the modified baseband signal;
modulating the phase signal to a carrier frequency and amplifying the modulated phase signal according to the amplitude signal to generate a preliminary radio frequency signal; and
feeding an offset compensation signal derived from the offset signal into the preliminary radio frequency signal to generate the radio frequency signal, wherein the offset compensation signal is configured to at least essentially cancel a distortion component, which corresponds to the offset signal, in the preliminary radio frequency signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A technique for generating a radio frequency signal (302) based on a baseband signal (304) is provided. As to a method aspect of the technique, an amplitude signal (r) and a phase signal (φ) depending on the baseband signal (304) are provided. The phase signal is modulated to a carrier frequency. As to another method aspect of the technique, a baseband signal (304) is modified by adding an offset signal to the baseband signal (304). The offset signal prevents the modified baseband signal (316) from entering a first signal region. An amplitude signal (r) and a phase signal (φ) is provided based on the modified baseband signal (316). The phase signal (φ) is modulated to a carrier frequency (ωc). The modulated phase signal (φ) is amplified according to the amplitude signal (r) to generate a preliminary radio frequency signal (318). A peak compensation signal (321), which depends on the baseband signal (304), or an offset compensation signal (320) derived from the offset signal (314), is fed into the preliminary radio frequency signal (318) to generate the radio frequency signal (302).
-
Citations
37 Claims
-
1. A method of generating a radio frequency signal based on a baseband signal, the method comprising:
-
modifying the baseband signal by adding an offset signal to the baseband signal, the offset signal being configured to prevent the modified baseband signal from entering a first signal region; providing an amplitude signal and a phase signal based on the modified baseband signal; modulating the phase signal to a carrier frequency and amplifying the modulated phase signal according to the amplitude signal to generate a preliminary radio frequency signal; and feeding an offset compensation signal derived from the offset signal into the preliminary radio frequency signal to generate the radio frequency signal, wherein the offset compensation signal is configured to at least essentially cancel a distortion component, which corresponds to the offset signal, in the preliminary radio frequency signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. A method of generating a radio frequency signal based on a baseband signal, the method comprising:
-
providing an amplitude signal and a phase signal depending on the baseband signal; modulating the phase signal to a carrier frequency and amplifying the modulated phase signal according to the amplitude signal to generate a preliminary radio frequency signal using a main modulating and amplifying circuit; and feeding a peak compensation signal, which depends on the baseband signal, into the preliminary radio frequency signal to generate the radio frequency signal, the peak compensation signal being generated using an auxiliary modulating and amplifying circuit and configured to at least essentially compensate for a saturation in the main modulating and amplifying circuit, wherein the auxiliary modulating and amplifying circuit is further used for feeding an offset compensation signal into the preliminary radio frequency signal, when the baseband signal is modified to reduce a bandwidth expansion in at least one of the phase signal and the amplitude signal. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
-
-
32. A device for generating a radio frequency signal based on a baseband signal, the device comprising:
-
a providing circuit adapted to provide an amplitude signal and a phase signal depending on the baseband signal; a main modulating and amplifying circuit adapted to modulate the phase signal to a carrier frequency and to amplify the modulated phase signal according to the amplitude signal to generate a preliminary radio frequency signal; and a feeding circuit adapted to feed a peak compensation signal, which depends on the baseband signal, into the preliminary radio frequency signal to generate the radio frequency signal, wherein the feeding circuit includes an auxiliary modulating and amplifying circuit adapted to generate the peak compensation signal configured to at least essentially compensate for a saturation in the main modulating and amplifying circuit, wherein the feeding circuit is further adapted to feed an offset compensation signal generated by the auxiliary modulating and amplifying circuit into the preliminary radio frequency signal, when the baseband signal is modified to reduce a bandwidth expansion in at least one of the phase signal and the amplitude signal.
-
-
33. A device for generating a radio frequency signal based on a baseband signal the device comprising:
-
a modifying circuit adapted to modify the baseband signal by adding an offset signal to the baseband signal, the offset signal being configured to prevent the modified baseband signal from entering a first signal region; a providing circuit adapted to provide an amplitude signal and a phase signal based on the modified baseband signal; a modulating and amplifying circuit adapted to modulate the phase signal to a carrier frequency and to amplify the modulated phase signal according to the amplitude signal to generate a preliminary radio frequency signal; and a feeding circuit adapted to feed an offset compensation signal derived from the offset signal into the preliminary radio frequency signal to generate the radio frequency signal, wherein the offset compensation signal is configured to at least essentially cancel a distortion component, which corresponds to the offset signal, in the preliminary radio frequency signal. - View Dependent Claims (34, 35, 36, 37)
-
Specification