Closed-loop power control device based on power synchronous detection and multi-point compensation

Abstract

The invention relates to a closed-loop power control device based on power synchronous detection and multi-point compensation, and the device comprises a power meter which is used for detecting the transmitting power and the feedback power at the same time; the gain calculation module is used for calculating a transmission link gain compensation value according to the detected transmission power and feedback power; the first transmitting link gain compensation module is arranged at the front end of the pre-distortion processing module in the divergent link and is used for performing gain compensation on the pre-distortion processing module; the second transmitting link gain compensation module is arranged at the front end of a power amplifier in a transmitting link and is used for performing gain compensation on the power amplifier; and the control module is used for adjusting the compensation values of the first transmitting link gain compensation module and the second transmitting link gain compensation module according to the transmitting link gain compensation value. According to the invention, the power of the transmitting link and the power of the feedback link can be synchronously detected, and an enough gain adjustment range can be ensured.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a closed-loop power control device based on power synchronization detection and multi-point compensation. Background Art

[0002] The gain of gain devices in the transmission link fluctuates with temperature and frequency, causing the transmission power to deviate from the target value. Closed-loop power control is a major means to ensure the accuracy of the transmission link output power, and is also the most commonly used solution in the industry.

[0003] The existing closed-loop power control method pre-calibrates the feedback link, and then periodically monitors the power change of the transmission link and the power change of the feedback link to determine whether the transmission power reaches the target value. If there is a difference between the two changes, the transmission link gain is adjusted to compensate. There are two important technical difficulties in this solution. One is the synchronization of detecting the transmission link power and the feedback link power; the other is the gain adjustment range of the transmission link gain compensation point. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a closed-loop power control device based on power synchronization detection and multi-point compensation, which can synchronously detect the power of the transmission link and the power of the feedback link and ensure a sufficient gain adjustment range.

[0005] The technical solution adopted by the present invention to solve the technical problem is: to provide a closed-loop power control device based on power synchronization detection and multi-point compensation, comprising:

[0006] A power meter, used to simultaneously detect the transmission power and the feedback power; the power meter uses transmission and feedback to enable detection at the same time, and triggers the detection based on frame timing information;

[0007] A gain calculation module, used to calculate a transmission link gain compensation value according to the detected transmission power and feedback power;

[0008] A first transmission link gain compensation module, arranged at the front end of the pre-distortion processing module in the divergent link, for performing gain compensation on the pre-distortion processing module;

[0009] A second transmission link gain compensation module, arranged at the front end of a power amplifier in the transmission link, for performing gain compensation on the power amplifier;

[0010] A control module is used to adjust the compensation values ​​of the first transmission link gain compensation module and the second transmission link gain compensation module according to the transmission link gain compensation value.

[0011] The power meter triggers detection based on frame timing information, wherein the frame timing information includes transmission link frame timing information and feedback link frame timing information; the transmission link frame timing information is aligned with CPRI 10ms as a reference; the feedback link frame timing information adds loop delay on the basis of the transmission link frame timing information.

[0012] The gain calculation module comprises:

[0013] A transmission link power variation calculation unit, used to calculate the transmission link power variation according to the detected divergent power detection value and the transmission power calibration value;

[0014] A feedback link power variation calculation unit, used to calculate the feedback power variation according to the detected feedback power detection value and the feedback power calibration value;

[0015] The gain compensation calculation unit is used to calculate the transmission link gain compensation value according to the transmission link power variation and the feedback power variation.

[0016] The transmission link power variation calculation unit calculates the power variation of the transmission link by P delta_tx =P current_tx -P rated_tx Calculate the transmission link power change, where P delta_tx is the transmission link power variation, P current_tx is the detected transmission power value, P rated_tx The transmit power calibration value.

[0017] The feedback link power variation calculation unit is configured by P delta_fb =P current_fb -P rated_fb Calculate the feedback power change, where P delta_fb is the feedback link power change, P current_fb is the detected feedback power value, P rated_fb is the feedback power calibration value.

[0018] The gain compensation calculation unit is formed by delta_gain=P delta_fb -P delta_tx Calculate the transmission link gain compensation value, where delta_gain is the transmission link gain compensation value, P delta_tx is the transmission link power variation, P delta_fb is the feedback link power change.

[0019] The control module comprises:

[0020] A judging unit, configured to determine whether the transmission link gain compensation value is less than or equal to a maximum adjustment value of the first transmission link gain compensation module;

[0021] A first control unit, configured to control the first transmission link gain compensation module to perform gain compensation with the transmission link gain compensation value when the transmission link gain compensation value is less than or equal to the maximum adjustment value of the first transmission link gain compensation module;

[0022] a second control unit, configured to control the first transmission link gain compensation module to perform gain compensation with the maximum adjustment value of the first transmission link gain compensation module when the transmission link gain compensation value is greater than the maximum adjustment value of the first transmission link gain compensation module, and control the second transmission link gain compensation module to perform gain compensation with the difference between the transmission link gain compensation value and the maximum adjustment value of the first transmission link gain compensation module.

[0023] The closed-loop power control device based on power synchronization detection and multi-point compensation also includes: a feedback link calibration module, which is arranged at the front end of the analog-to-digital converter of the feedback link, and is used to adjust the calibration value so that the feedback link power reaches the feedback power calibration value when the output of the power amplifier of the transmitting link is the maximum rated power.

[0024] Beneficial Effects

[0025] Due to the adoption of the above-mentioned technical scheme, the present invention has the following advantages and positive effects compared with the prior art: the present invention uses a power meter for synchronous detection, which can more accurately calculate the gain compensation value, thereby ensuring that the transmission power is closer to the target value. Two gain compensation devices are provided in the transmission link of the present invention. The two gain compensation devices can expand the gain adjustment range, so that the power control scheme can adapt to more severe high and low temperature environments and support a larger transmission frequency range. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a closed-loop power control device based on power synchronization detection and multi-point compensation according to an embodiment of the present invention;

[0027] Figure 2 It is a structural diagram of an embodiment of the present invention applied to a digital front end DFE. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0029] The embodiment of the present invention relates to a closed-loop power control device based on power synchronization detection and multi-point compensation, such as Figure 1 and Figure 2 As shown, Figure 2 In the embodiment, the forward link is a transmission link, the reverse link is a feedback link, and the feedback link monitors the output signal of the power amplifier PA. The closed-loop power control device of this embodiment includes:

[0030] A power meter is used to detect the transmission power and feedback power at the same time. The power meter in this embodiment uses transmission and feedback to enable detection at the same time, and triggers detection based on frame timing information. Among them, the frame timing information includes transmission link frame timing information and feedback link frame timing information; the transmission link frame timing information is aligned with CPRI 10ms as a reference; the feedback link frame timing information adds loop delay on the basis of the transmission link frame timing information. By triggering detection based on frame timing information, it can be ensured that the transmission detection and feedback detection are at the same position of the same frame, thereby realizing synchronous detection of transmission power and feedback power.

[0031] The gain calculation module is used to calculate the transmission link gain compensation value according to the detected transmission power and feedback power. The gain calculation module in this embodiment includes a transmission link power variation calculation unit, a feedback link power variation calculation unit and a gain compensation calculation unit.

[0032] The transmission link power variation calculation unit is used to calculate the transmission link power variation according to the detected divergent power detection value and the transmission power calibration value. The specific calculation method is: delta_tx =P current_tx -P rated_tx , where P delta_tx is the transmission link power variation, P current_tx is the detected transmission power value, P rated_tx The transmit power calibration value.

[0033] The feedback link power variation calculation unit is used to calculate the feedback power variation according to the detected feedback power detection value and the feedback power calibration value. The specific calculation method is: delta_fb =P current_fb -P rated_fb , where P delta_fb is the feedback link power change, P current_fb is the detected feedback power value, P rated_fb is the feedback power calibration value.

[0034] The gain compensation calculation unit is used to calculate the transmission link gain compensation value according to the transmission link power change and the feedback power change. The specific calculation method is: delta_gain = P delta_fb -P delta_tx , where delta_gain is the transmit link gain compensation value.

[0035] Among them, the transmission power calibration value refers to the power value of the transmission link (TX power detection point) when the power amplifier PA outputs the maximum rated power, and the feedback power calibration value refers to the power value of the feedback link (FB power detection point) when the power amplifier PA outputs the maximum rated power.

[0036] The first transmission link gain compensation module (i.e. Figure 2 PD_IN gain adjustment point in the transmission link), which is arranged at the front end of the pre-distortion processing module PD in the transmission link, and is used to perform gain compensation for the pre-distortion processing module PD;

[0037] The second transmission link gain compensation module (i.e. Figure 2 A DSA on a transmitting link in the transmission link), arranged at the front end of a power amplifier PA in the transmission link, for performing gain compensation on the power amplifier PA;

[0038] The control module is configured to adjust the compensation values ​​of the first transmission link gain compensation module and the second transmission link gain compensation module according to the transmission link gain compensation value delta_gain. When performing gain compensation, the control module of this embodiment preferentially adjusts the gain compensation value delta_gain of the first transmission link gain compensation module. pd_in , the gain compensation value g in the first transmission link gain compensation module pd_in After the range is fully used, adjust the gain compensation value g of the second transmission link gain compensation module tx_dsa Therefore, the control module in this embodiment includes:

[0039] A judging unit, configured to determine whether the transmission link gain compensation value delta_gain is less than or equal to the maximum adjustment value of the first transmission link gain compensation module. That is, determining whether the transmission link gain compensation value delta_gain is within the adjustment range of the first transmission link gain compensation module;

[0040] The first control unit is used to control the transmission link gain compensation value delta_gain to be less than or equal to the maximum adjustment value of the first transmission link gain compensation module. When, that is, when the transmission link gain compensation value delta_gain is within the adjustment range of the first transmission link gain compensation module, the first transmission link gain compensation module is controlled to perform gain compensation with the transmission link gain compensation value delta_gain;

[0041] The second control unit is used to control the transmission link gain compensation value delta_gain to be greater than the maximum adjustment value of the first transmission link gain compensation module. When the transmission link gain compensation value delta_gain exceeds the adjustment range of the first transmission link gain compensation module, the first transmission link gain compensation module is controlled to adjust the gain compensation value of the first transmission link gain compensation module to the maximum adjustment value of the first transmission link gain compensation module. Perform gain compensation, control the second transmission link gain compensation module to adjust the transmission link gain compensation value delta_gain and the maximum adjustment value of the first transmission link gain compensation module The difference (i.e. ) for gain compensation.

[0042] The closed-loop power control device based on power synchronization detection and multi-point compensation in this embodiment further includes: a feedback link calibration module (i.e. Figure 2 The DSA in the feedback link is arranged at the front end of the analog-to-digital converter ADC of the feedback link, and is used to adjust the calibration value G when the output of the power amplifier PA of the transmitting link is the maximum rated power. fb_dsa Make the feedback link power reach the feedback power calibration value.

[0043] It is not difficult to find that the present invention uses a power meter for synchronous detection, which can more accurately calculate the gain compensation value, thereby ensuring that the transmission power is closer to the target value. Two gain compensation devices are provided in the transmission link of the present invention. The two gain compensation devices can expand the gain adjustment range, so that the power control scheme can adapt to more severe high and low temperature environments and support a larger transmission frequency range.

Claims

1. A closed-loop power control device based on power synchronous detection and multi-point compensation, characterized in that: include: A power meter, used to simultaneously detect transmission power and feedback power; the power meter uses transmission and feedback to enable detection at the same time, and triggers detection based on frame timing information; A gain calculation module, used to calculate a transmission link gain compensation value according to the detected transmission power and feedback power; A first transmission link gain compensation module, arranged at the front end of the pre-distortion processing module in the divergent link, for performing gain compensation on the pre-distortion processing module; A second transmission link gain compensation module, arranged at the front end of a power amplifier in the transmission link, for performing gain compensation on the power amplifier; A control module is used to adjust the compensation values ​​of the first transmission link gain compensation module and the second transmission link gain compensation module according to the transmission link gain compensation value.

2. The closed-loop power control device based on power synchronous detection and multi-point compensation according to claim 1 is characterized in that: The power meter triggers detection based on frame timing information, wherein the frame timing information includes transmission link frame timing information and feedback link frame timing information; the transmission link frame timing information is aligned with CPRI 10ms as a reference; the feedback link frame timing information adds loop delay on the basis of the transmission link frame timing information.

3. The closed-loop power control device based on power synchronous detection and multi-point compensation according to claim 1 is characterized in that: The gain calculation module comprises: A transmission link power variation calculation unit, used to calculate the transmission link power variation according to the detected transmission power detection value and the transmission power calibration value; A feedback link power variation calculation unit, used to calculate the feedback power variation according to the detected feedback power detection value and the feedback power calibration value; The gain compensation calculation unit is used to calculate the transmission link gain compensation value according to the transmission link power variation and the feedback power variation.

4. The closed-loop power control device based on power synchronous detection and multi-point compensation according to claim 3 is characterized in that: The transmission link power variation calculation unit calculates the power variation of the transmission link by P delta_tx =P current_tx -P rated_tx Calculate the transmission link power change, where P delta_tx is the transmission link power variation, P current_tx is the detected transmission power value, P rated_tx The transmit power calibration value.

5. The closed-loop power control device based on power synchronous detection and multi-point compensation according to claim 3 is characterized in that: The feedback link power variation calculation unit is configured by P delta_fb =P current_fb -P rated_fb Calculate the feedback power change, where P delta_fb is the feedback link power change, P current_fb is the detected feedback power value, P rated_fb It is the feedback power calibration value.

6. The closed-loop power control device based on power synchronous detection and multi-point compensation according to claim 3 is characterized in that: The gain compensation calculation unit is formed by delta_gain=P delta_fb -P delta_tx Calculate the transmission link gain compensation value, where delta_gain is the transmission link gain compensation value, P delta_tx is the transmission link power variation, P delta_fb is the feedback link power change.

7. The closed-loop power control device based on power synchronous detection and multi-point compensation according to claim 1, characterized in that: The control module comprises: A judging unit, configured to determine whether the transmission link gain compensation value is less than or equal to a maximum adjustment value of the first transmission link gain compensation module; A first control unit, configured to control the first transmission link gain compensation module to perform gain compensation with the transmission link gain compensation value when the transmission link gain compensation value is less than or equal to the maximum adjustment value of the first transmission link gain compensation module; a second control unit, configured to control the first transmission link gain compensation module to perform gain compensation with the maximum adjustment value of the first transmission link gain compensation module when the transmission link gain compensation value is greater than the maximum adjustment value of the first transmission link gain compensation module, and control the second transmission link gain compensation module to perform gain compensation with the difference between the transmission link gain compensation value and the maximum adjustment value of the first transmission link gain compensation module.

8. The closed-loop power control device based on power synchronous detection and multi-point compensation according to claim 1, characterized in that: Also includes: The feedback link calibration module is arranged at the front end of the analog-to-digital converter of the feedback link, and is used to adjust the calibration value so that the feedback link power reaches the feedback power calibration value when the output of the power amplifier of the transmitting link is the maximum rated power.

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