Automatic gain control device and method, power adjusting device and radio transmitting system
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a technology of automatic gain control and power adjustment, applied in the field of signal processing, can solve problems such as degrading the performance of communication systems, and achieve the effect of improving the performance of automatic gain control and lowering the complexity of hardwar
Inactive Publication Date: 2015-02-24
FUJITSU LTD
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Abstract
Description
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[0010]The inventors have identified that only an amount of change in power of an out-band signal output from the power amplifier is required in the adaptive scalar pre-distorter without requiring any absolute power value of the out-band signal. In view of this feature, the present disclosure proposes an automatic gain control device and an automatic gain control method with improved performance and at a lowered cost as well as a power adjusting device and a radio transmitting system in which the automatic gain control device and the automatic gain control method are applied.
[0015]According to the embodiments of the present disclosure, the complexity in hardware can be lowered in automatic gain control, for example, the gain of the variable gain amplifier may not necessarily be adjusted in real time, or for example, an analog-digital converter or a digital-analog converter with a lower number of bits can be used. Furthermore the performance of automatic gain control can be improved as well in the embodiments of the present disclosure.
Problems solved by technology
Nonlinearity inherent to Power Amplifiers (PAs) used in radio communication systems may result in out-band spectrum spreading and in-band signal distortion of output signal power and further degrade the performance of the communication systems.
Method used
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first embodiment
[1. Configuration of First Embodiment]
[0031]A first embodiment of the present disclosure will be described below with reference to FIG. 3 and FIG. 4, and firstly a configuration of the first embodiment of the present disclosure will be described with reference to FIG. 3.
[0032]FIG. 3 illustrates a configuration example of an automatic gain control device according to a first embodiment of the present disclosure as an example of the automatic gain control device according to the embodiment of the present disclosure.
[0033]The automatic gain control device 190 illustrated in FIG. 3 includes a mixer 181, an analog band pass filter 182, a variable gain amplifier 183, an analog-digital converter 194, a cost function calculating unit 185, an automatic gain control algorithm module 196 and a second digital-analog converter 187, where the mixer 181, the analog band pass filter 182, the variable gain amplifier 183 and the second digital-analog converter 187 are provided with substantially the ...
second embodiment
[3. Configuration of Second Embodiment]
[0066]A second embodiment of the present disclosure will be described below with reference to FIG. 5 to FIG. 8, and firstly a configuration of the second embodiment of the present disclosure will be described with reference to FIG. 5.
[0067]FIG. 5 illustrates a configuration example of an automatic gain control device according to a second embodiment of the present disclosure as an example of the automatic gain control device according to the embodiment of the present disclosure.
[0068]The automatic gain control device 200 illustrated in FIG. 5 includes a mixer 181, an analog band pass filter 182, a variable gain amplifier 183, an analog-digital converter 194, a cost function calculating unit 205, an automatic gain control algorithm module 206 and a second digital-analog converter 187, where the mixer 181, the analog band pass filter 182, the variable gain amplifier 183 and the second digital-analog converter 187 are provided with substantially t...
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Abstract
An automatic gain control device includes: a variable gain adjusting unit, for adjusting an input signal by a variable gain and outputting an adjustment result; an analog-digital converting unit, for performing analog-digital conversion on the adjustment result to obtain an analog-digital conversion result; and a gain determining unit, for determining a distribution status over a predetermined period of time of a maximum or a minimum of the analog-digital conversion result, comparing the distribution status with a first distribution condition, and if the distribution status meets the first distribution condition, then keeping the variable gain unchanged, otherwise changing the variable gain and determining newly a distribution status until the newly determined distribution status meets a second distribution condition which is at least as strict as the first distribution condition.
Description
FIELD OF THE INVENTION[0001]The present invention relates to the field of signal processing and in particular to an automatic gain control device, an automatic gain control method, a power adjusting device and a radio transmitting system.BACKGROUND OF THE INVENTION[0002]Nonlinearity inherent to Power Amplifiers (PAs) used in radio communication systems may result in out-band spectrum spreading and in-band signal distortion of output signal power and further degrade the performance of the communication systems. At present, adaptive pre-distorters have been widely used in the wireless communication systems to compensate for the effects due to the nonlinearity of the power amplifiers.[0003]An adaptive scalar pre-distorter samples out-band power of an output signal of a power amplifier and adjusts parameters of the pre-distorter adaptively to a change in power thereof to thereby achieve linearity of the power amplifier, as illustrated in FIG. 1. FIG. 1 illustrates a configuration of a p...
Claims
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