WO2012027982A1

WO2012027982A1 - Complementary enhanced power compensating method, apparatus and communication device

Info

Publication number: WO2012027982A1
Application number: PCT/CN2011/071884
Authority: WO
Inventors: 李搏
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-09-03
Filing date: 2011-03-16
Publication date: 2012-03-08
Also published as: CN101977022A; CN101977022B

Abstract

A complementary enhanced power compensating method is provided, relating to the technical field of mobile communication. The method comprises the following steps: acquiring the detected voltage of a power amplifier and the desired power voltage indicating the desired output power of a communication device (S10); comparing the detected voltage of the power amplifier and the desired power voltage, and outputting the comparison result to an adjustable attenuator (S20); adjusting the transmission power output to the power amplifier according to the comparison result by the adjustable attenuator (S30). There are also provided a complementary enhanced power compensating apparatus and a communication device. With the solutions applied, the communication device can work meeting the demands of a wide temperature range and a broad frequency band, and the transmission power remains stable.

Description

Complementary enhanced power compensation method, device and communication device

The present invention relates to the field of mobile communications technologies, and in particular, to a complementary enhanced power compensation method, apparatus, and communication device. Background technique

With the continuous development of technology, mobile phones, data cards, wireless broadband, multi-mode terminals, WiMAX (Worldwide Interoperability for Microwave Access), and LTE (Long Term Evolution) and other communication devices have been There is a greater degree of popularity.

The communication equipment needs to perform power compensation when transmitting signals to meet the requirements of power stability, avoiding high transmission power, causing product failure due to exceeding the radiation standard, or low transmission power affecting product performance and coverage.

The ambient temperature is not necessarily constant temperature, but may be high temperature or low temperature. Low power (less than 14dBm) When transmitting, the power accuracy is low, so the compensation can be satisfied by using the look-up table method. The principle of the look-up method is based on the real-time temperature of the communication device fed back by the thermistor, and the power compensation is performed corresponding to the pre-calculated compensation power value. The relationship between the compensation power and the thermistor detection temperature is shown in Table 1 below:

Compensation power (dB) Thermistor detects temperature

8.25 -20 ° C

7.50 -12 ° C

7.00 -4 ° C

6.25 4°C

5.50 12°C 4.75 20°C

4.00 28°C

3.25 36°C

2.25 44°C

1.25 52°C

0.25 60 ° C

0 68°C

-0.75 76°C

-1.75 84°C

-2.5 92°C

-3.5 100°C Table 1 However, when high-frequency transmission is performed in a wide frequency band in high and low temperature environment, the gain deviation of the device is inconsistent, which tends to cause large gain deviation; and the operating bandwidth of individual devices is critical, and the power offset is high in high and low temperature environments. It will cause the high frequency point or low frequency point deviation to be larger than the general frequency point, so that the temperature and gain response trends are different, and the communication equipment has stricter control on the transmission power. Therefore, the look-up table method is used to ensure the full-band power fluctuation is consistent. The requirements are more difficult, and it is difficult to meet the power stability requirements of communication equipment. Summary of the invention

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a complementary enhanced power compensation method or apparatus for improving the adaptability of a product to accommodate more operating ambient temperatures.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

A complementary enhanced power compensation method includes the following steps:

Obtaining a detection voltage of the power amplifier and a desired power voltage representing a desired output power of the communication device; Comparing the obtained detection voltage with a desired power voltage, and outputting the comparison result to the adjustable attenuator;

The adjustable attenuator adjusts the transmit power output to the power amplifier based on the comparison result.

Comparing the detection voltage with a desired power voltage and outputting the comparison result to the adjustable attenuator further includes:

When the output power of the power amplifier is less than 14dBm, the power supply circuit of the adjustable attenuator is switched to the constant voltage power supply circuit.

Adjusting the transmit power according to the comparison result, including:

When the actual output power of the communication device is equal to the power of the desired output, the difference obtained by subtracting the detection voltage of the power amplifier from the desired power voltage is set as a standard differential value, and the output power output to the power amplifier at this time is output. As standard transmission power;

Upregulating the standard transmit power when a detection voltage of the power amplifier minus a value of the desired power voltage is less than a standard voltage difference value;

The standard transmit power is lowered when the detection voltage of the power amplifier minus the value of the desired power voltage is greater than the standard voltage difference.

The process of obtaining the detection voltage and the desired power voltage includes:

Outputting a desired output power of the communication device with a digital signal;

The digital signal is digital-to-analog converted to output a desired power voltage indicative of a desired output power of the communication device.

When the detection voltage and the desired power voltage are obtained, the method further includes:

The slope of the detection voltage of the power amplifier is adjusted based on the desired slope of the desired power voltage such that the slope of the detection voltage of the power amplifier coincides with the slope of the desired power voltage of the peer.

A complementary enhanced power compensation device, comprising:

a voltage acquisition module, configured to acquire a detection voltage of the power amplifier and indicate a communication device period Looking at the desired power voltage of the output power;

a voltage comparator, configured to compare the detected voltage of the obtained power amplifier with the desired power voltage, and output the comparison result to the adjustable attenuator;

An adjustable attenuator for adjusting the transmit power output to the power amplifier based on the received comparison result.

Also includes:

The switching unit is configured to switch the power supply circuit of the adjustable attenuator to the constant voltage power supply circuit when the output power of the power amplifier is less than 14 dBm.

The adjustable attenuator includes:

a standard configuration module, configured to set, when the power actually output by the communication device is equal to the power of the desired output, a difference obtained by subtracting the detection voltage of the power amplifier from the desired power voltage as a standard pressure difference value, and outputting at this time a transmission power to the power amplifier as a standard transmission power; a trimming module, configured to: when the detection voltage of the power amplifier minus the value of the desired power voltage is less than a standard voltage difference, up-regulate the standard transmission power; and, when the power amplifier The standard transmit power is lowered when the detected voltage minus the value of the desired power voltage is greater than the standard differential value.

The voltage acquisition module includes:

Dedicating a power indicator sub-block for outputting a desired output power of the communication device by a digital signal;

A DAC converter for digital to analog conversion of the digital signal to output a desired power voltage indicative of a desired output power of the communication device.

The voltage acquisition module further includes a slope adjustment circuit for adjusting a slope of the detection voltage of the power amplifier according to the desired slope of the output power voltage, so that the slope of the detection voltage of the power amplifier is consistent with the slope of the desired power voltage of the peer.

A communication device, wherein a complementary enhanced power compensation device is provided, the complementary enhanced power compensation device comprising: a voltage acquisition module, configured to acquire a detection voltage of the power amplifier and a desired power voltage representing a desired output power of the communication device;

Also included is a complementary enhanced power compensation device according to any one of claims 7 to 10. The complementary enhanced power compensation method, device or communication device provided by the present invention compares the detection voltage of the power amplifier with the expected power voltage of the communication device at a high power output, and adjusts the transmission power according to the comparison result. The device's actual output power is balanced with the desired output power; and, at low power output, it can be switched to the existing power compensation, using the existing look-up table for power compensation, and the communication device can operate at a large temperature. The transmit power remains stable under the requirements of the range and wide frequency band. DRAWINGS

1 is a flowchart of a complementary enhanced power compensation method according to an embodiment of the present invention; FIG. 2 is a flowchart of a complementary enhanced power compensation method according to an embodiment of the present invention; FIG. 3 is a comparison according to an embodiment of the present invention. a flow chart for adjusting the transmit power output to the power amplifier;

4 is a flow chart showing obtaining a detection voltage of a power amplifier and a desired power voltage representing a desired output power of the communication device in an embodiment of the present invention;

Figure 5 is a schematic structural view of a voltage slope in an embodiment of the present invention;

6 is a schematic structural view of a complementary enhanced power device according to an embodiment of the present invention; and FIG. 7 is a schematic structural view of a complementary enhanced power device according to an embodiment of the present invention. detailed description

It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the present invention, the communication device may be a communication terminal or a signal transmitting device in a communication system, etc., wherein a power amplifier and a signal transmitting antenna are provided, and the power output from the power amplifier and the loss of the power amplifier to the antenna port are calculated. The actual output power of the communication device.

FIG. 1 shows a flow of a complementary enhanced power compensation method in an embodiment of the present invention, the flow comprising the following steps:

Step S10, obtaining a detection voltage of the power amplifier and a desired power voltage indicating a desired output power of the communication device; the detection voltage can reflect the power value actually output by the power amplifier, and the detection voltage of the power amplifier can be obtained by using the detection circuit. The relationship between the actual output power value of the power amplifier and the detection voltage can be found in Table 2 below:

Table 2 The desired power voltage of the communication device can output a digital signal representing a desired power through a CPU (Central Processing Unit) chip and an extended GPIO (General Purpose Input Output) line in the communication device, for example, Control the extended GPIO port according to the API (Application Programming Interface) command output from the CPU chip, output high and low level to indicate 0, 1 , and select the number of GPIO lines to be used according to the range of power output, as shown in Table 3 below. Show: 14~25dBm power value, using 5 GPIO lines to represent the output power 25dBm value.

Table 3 shows the digital signal of the desired output power through the GPIO line input to an analog-to-digital converter (DAC) for analog voltage conversion to obtain the desired power voltage.

Step S20, comparing the detection voltage of the power amplifier with the desired power voltage, and The comparison result is output to the adjustable attenuator; the comparison between the two can be performed by a voltage comparator, for example, the output of the detection voltage and the output of the desired power voltage can be connected to the voltage comparator, and the voltage comparison is performed. The comparator obtains the comparison result and outputs it to the adjustable attenuator.

Step S30, the adjustable attenuator adjusts the transmit power output to the power amplifier according to the comparison result. For example, the adjustable attenuator is set at the output of the voltage comparator, receives the comparison result of the voltage comparator, and adjusts the attenuation of the transmission path according to the voltage difference, so that the transmission power output to the power amplifier is adjusted.

In the above embodiment of the present invention, the detection voltage of the power amplifier is obtained and compared with the expected power voltage of the communication device, and then the output power of the power amplifier is adjusted according to the comparison result to form a closed loop power adjustment, so that the terminal can be in a high and low temperature environment. When transmitting in a wide frequency band and high power, the transmission power remains stable.

In an embodiment, in addition to the above steps, the complementary enhanced power compensation method of the present invention further includes a step S40: when the output power of the power amplifier is less than 14 dBm, the power supply circuit of the adjustable attenuator is switched to the constant voltage power supply circuit. A switch can be provided between the output of the voltage comparator and the input of the adjustable attenuator. When the output power of the power amplifier is less than 14 dBm (voltage is lower than 0.65 V), the power supply circuit of the adjustable attenuator is switched by the switch. Switch to the constant voltage supply circuit. In an embodiment, when the device is calibrated or self-tested, the CPU chip GPIO output is low according to the API, that is, the voltage of the GPIO after passing through the DAC converter is close to 0V, and the adjustable attenuator can be powered by the switch. The circuit is switched from the voltage comparator to the constant voltage circuit, and the closed-loop power control is no longer performed, and the power compensation is performed using the look-up table method.

In this embodiment, by setting a preset value and switching according to a preset value, the communication device can also perform power compensation by using a look-up table method, thereby expanding the use range of the communication device.

Referring to FIG. 3, the foregoing step S30 may include:

Step S31, when the power actually output by the communication device is equal to the power of the desired output, setting the difference between the detection voltage of the power amplifier and the expected power voltage is the standard pressure difference. Value, and the transmit power output to the power amplifier is the standard transmit power at this time; when the actual output power of the communication device is equal to the expected output power of the communication device, the power transmission of the communication device is balanced, and thus the detection of the power amplifier at this time can be set. The voltage is subtracted from the standard differential pressure value obtained by the communication device at the desired output power voltage. The adjustable attenuator sets the amount of attenuation at this standard differential pressure to the standard attenuation, at which the transmitted power is standard power, thereby adjusting the transmit power.

Step S32, when the detection voltage of the power amplifier minus the value of the expected power voltage is less than the standard voltage difference, the standard transmission power is raised; at this time, the detection voltage of the power amplifier is too small, resulting in the detection voltage of the power amplifier minus the communication. The value of the expected output power voltage of the device is less than the standard differential pressure value, so that the input to the adjustable attenuator voltage is small, the attenuation of the adjustable attenuator to the transmission path is less than the standard value, and the power of the transmission path input to the power amplifier becomes higher, the power amplifier The output power also becomes high. The detection voltage of the power amplifier begins to increase until the detection voltage of the power amplifier minus the desired output power voltage of the communication device is equal to the standard voltage difference.

Step S33, when the detection voltage of the power amplifier minus the value of the desired power voltage is greater than the standard voltage difference, the standard transmission power is lowered. When the actual output power of the communication device is relatively large relative to the expected output power of the communication device, the detection voltage of the power amplifier is too large, and the detection voltage of the power amplifier minus the expected output power voltage of the communication device is greater than the standard differential value, so that the input The voltage to the adjustable attenuator is too large, so the attenuation of the adjustable attenuator to the path is greater than the standard attenuation, the power of the input power amplifier of the transmission path becomes lower, and the output power of the power amplifier is also lower after amplification. The detection voltage of the power amplifier begins to decrease until the detection voltage of the power amplifier minus the desired output power voltage of the communication device is equal to the standard differential value.

Referring to FIG. 4, the foregoing step S10 may include:

Step S11, outputting the desired output power of the communication device by using a digital signal; outputting a digital signal indicating a desired power through the CPU chip and the extended GPIO line in the communication device, for example, controlling the extended GPIO port according to an API command output by the CPU chip, Output high and low to indicate 0, 1 , and select the number of GPIO lines to use according to the range of power output. For specific examples, refer to Table 3 above.

Step S12, digital-to-analog conversion is performed on the digital signal to output a desired power voltage corresponding to a desired output power of the communication device. Analog voltage conversion can be performed by a DAC converter to obtain the desired power voltage.

In this embodiment, by increasing the API command of the CPU chip, the GPIO port is controlled to output a desired power voltage indicating the desired output power of the communication device, thereby comparing with the real-time power amplifier hung detection voltage, and the closed loop power control is achieved, which is easy to implement.

In an embodiment, after performing step S12, the method further includes:

Step S13, adjusting the detection voltage slope of the power amplifier according to the output desired power voltage slope, so that the detection voltage slope of the power amplifier is consistent with the equal expected power voltage slope. Referring to the above embodiment of FIG. 5, according to the correspondence relationship of the above Table 2, the detection voltage of the power amplifier can linearly represent the power value of 14~25dBm, and the step voltage of 0.1V basically represents the change of the power of the ldB, in order to improve the control precision, The slope is increased by the slope adjustment circuit such that the slope of the detection voltage of the power amplifier coincides with the slope of the desired power voltage of the peer.

In this embodiment, the power compensation accuracy is improved by adjusting the slope of the detection voltage.

Referring to Fig. 6, there is shown a schematic configuration diagram of a complementary enhanced power compensating apparatus according to an embodiment of the present invention. The complementary enhanced power compensation device includes:

The voltage acquisition module 10 is configured to acquire a detection voltage of the power amplifier 20 and a desired power voltage indicating a desired output power of the communication device. In an embodiment, the voltage acquisition module 10 may include an output power detection module 11 disposed inside the power amplifier 20 And a desired power indicating sub-block 12, wherein the output power detecting module 11 can be used to obtain the detecting voltage of the power amplifier 20. It is known that the detecting voltage of the power amplifier 20 can reflect its actual output power, and the actual output power of the power amplifier 20 is added thereto. The actual output power of the communication device can be known from the loss at the antenna end. The desired power indication sub-block 12 includes a CPU chip and the above GPIO line, which can pass through the CPU. The chip transmit API command controls the GPIO output to indicate the desired output voltage of the desired output power of the communication device. For details, refer to the embodiment shown in FIG. 1 above.

The voltage comparator 30 is configured to compare the detection voltage of the power amplifier 20 with the desired power voltage, and output the comparison result to the adjustable attenuator; in an embodiment, the input of the voltage comparator 30 and the output power respectively The output of the detection module 11 is connected to the output of the desired power indicating sub-block 12; the output is connected to the adjustable attenuator 40.

The adjustable attenuator 40 is configured to adjust the transmit power output to the power amplifier 20 based on the comparison result. In an embodiment, the adjustable attenuator 40 is provided with a standard configuration module 41, which can be obtained by setting the detection voltage of the power amplifier minus the desired power voltage when the power actually output by the communication device is equal to the power of the desired output. The difference is the standard differential pressure, and the transmit power output to the power amplifier is the standard transmit power at this time; when the actual output power of the communication device is equal to the expected output power of the communication device, the power transmission of the communication device is balanced, and thus the The standard voltage difference obtained by subtracting the desired output power voltage of the communication device from the detection voltage of the power amplifier. In one embodiment, the adjustable attenuator 40 sets the amount of attenuation at the standard differential pressure value to a standard amount of attenuation at which the transmitted power is standard power, thereby adjusting the transmit power.

The adjustable attenuator 40 further includes a trimming module 42, which can be used to up-regulate the standard transmit power when the detection voltage of the power amplifier minus the value of the desired power voltage is less than the standard voltage difference; at this time, the detection voltage of the power amplifier is biased Small, the detection voltage of the power amplifier minus the expected output power voltage of the communication device is less than the standard pressure difference, so that the voltage input to the adjustable attenuator 40 is small, and the attenuation of the adjustable attenuator 40 to the transmission path is less than the standard value. The power of the transmit path input to the power amplifier becomes higher, and the output power of the power amplifier also becomes higher. The detection voltage of the power amplifier begins to increase until the detection voltage of the power amplifier minus the desired output power of the communication device is equal to the standard differential value.

The fine tuning module 42 is further configured to subtract the expected power from the detection voltage of the power amplifier. When the value of the pressure is greater than the standard differential pressure, the standard transmit power is lowered. When the actual output power of the communication device is relatively large relative to the expected output power of the communication device, the detection voltage of the power amplifier is too large, and the detection voltage of the power amplifier minus the expected output power voltage of the communication device is greater than the standard differential value, so that the input The voltage to the adjustable attenuator 40 is too large, so the attenuation of the adjustable attenuator 40 to the path is greater than the standard attenuation, the power of the input power amplifier of the transmission path becomes lower, and the output power of the power amplifier is also reduced. The detection voltage of the power amplifier begins to decrease until the detection voltage of the power amplifier minus the desired output power voltage of the communication device is equal to the standard differential pressure value.

Referring to FIG. 7, in an embodiment, the complementary enhanced power compensation apparatus may further include: a switching unit 50, configured to switch the power supply circuit of the adjustable attenuator to the constant voltage power supply circuit when the output power of the power amplifier is less than 14 dBm. In a specific example, the switching unit 50 may be a switching switch disposed between the output end of the voltage comparator and the input end of the adjustable attenuator, and the output power of the power amplifier 20 may be set to be less than or equal to 14 dBm. The switch switches the input circuit of the adjustable attenuator 40 to a constant voltage supply circuit. The switching unit 50 can eliminate the closed loop power control when the device is calibrated or self-test, and use the look-up table method for power compensation.

In one embodiment, the output power detection module 11 is a detection circuit disposed in the power amplifier 20 for obtaining the detection voltage of the power amplifier 20, and its output terminal is connected to a slope adjustment circuit 13. The output detection voltage is adjusted by the slope adjustment circuit 13 so that its slope coincides with the slope of the desired power voltage of the equivalent, thereby improving the power compensation accuracy.

The desired power indicator sub-block 12 includes a CPU chip 121, a GPIO line 122, and a DAC converter 123. The CPU chip 121 is configured to output a desired output power of the device, and can send an API command to control the extended GPIO port, and output the high and low levels through the GPIO line 122. Representing 0, 1 , the number of GPIO lines 122 can be selected according to the range of power output, and the DAC converter 123 can perform digital-to-analog conversion on the digital signal representing the desired output power to obtain the desired power voltage.

The present invention also provides a communication device that is provided with the above-described power compensation device in addition to the basic module for communication. The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the present invention and the drawings are used directly or indirectly in other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims

Claim

A complementary enhanced power compensation method, comprising the steps of: obtaining a detection voltage of a power amplifier and a desired power voltage representing a desired output power of the communication device;

Comparing the obtained detection voltage with a desired power voltage, and outputting the comparison result to the adjustable attenuator;

2. The method according to claim 1, wherein when the detection voltage is compared with a desired power voltage and the comparison result is output to the adjustable attenuator, the method further comprises:

3. The method according to claim 1 or 2, wherein adjusting the transmit power according to the comparison result comprises:

4. The method of claim 3, wherein the obtaining the detection voltage and the desired power voltage comprises:

Performing digital-to-analog conversion on the digital signal, thereby outputting a desired output power of the communication device Expected power voltage.

The method of claim 4, wherein when the detecting voltage and the expected power voltage are obtained, the method further comprises:

6. A complementary enhanced power compensation device, comprising:

a voltage acquisition module, configured to acquire a detection voltage of the power amplifier and a desired power voltage indicating a desired output power of the communication device;

7. The device of claim 6, further comprising:

The device according to claim 6 or 7, wherein the adjustable attenuator comprises: a standard configuration module, configured to: when the actual output power of the communication device is equal to the power of the desired output, The difference obtained by subtracting the desired power voltage from the detection voltage is set as a standard voltage difference value, and the transmission power outputted to the power amplifier at this time is used as a standard transmission power; a trimming module is used to subtract the detection voltage of the power amplifier Upregulating the standard transmit power when the value of the desired power voltage is less than the standard voltage difference; and, when the value of the power amplifier minus the expected power voltage is greater than the standard voltage difference, lowering the standard transmit power .

The device according to claim 8, wherein the voltage acquisition module comprises: a desired power indication sub-block, configured to output a desired output power of the communication device by using a digital signal; And a DAC converter for performing digital to analog conversion on the digital signal to output a desired power voltage indicative of a desired output power of the communication device.

The device according to claim 9, wherein the voltage acquisition module further comprises a slope adjustment circuit, configured to adjust a slope of the detection voltage of the power amplifier according to a desired slope of the desired power voltage, so as to determine a slope of the detection voltage of the power amplifier. Consistent with the expected power voltage slope of the peer.

A communication device, wherein a complementary enhanced power compensation device is provided, the complementary enhanced power compensation device comprising:

The communication device according to claim 11, characterized by further comprising the complementary enhanced power compensation device according to any one of claims 7 to 10.