WO2017215178A1 - 反馈通道在线校准方法及装置 - Google Patents

反馈通道在线校准方法及装置 Download PDF

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Publication number
WO2017215178A1
WO2017215178A1 PCT/CN2016/103985 CN2016103985W WO2017215178A1 WO 2017215178 A1 WO2017215178 A1 WO 2017215178A1 CN 2016103985 W CN2016103985 W CN 2016103985W WO 2017215178 A1 WO2017215178 A1 WO 2017215178A1
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WIPO (PCT)
Prior art keywords
power
feedback channel
calibration
output
current
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PCT/CN2016/103985
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English (en)
French (fr)
Inventor
赵大千
陈豪
马兴望
林洁
熊林江
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中兴通讯股份有限公司
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Publication of WO2017215178A1 publication Critical patent/WO2017215178A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/08—Closed loop power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
    • H04W52/226—TPC being performed according to specific parameters taking into account previous information or commands using past references to control power, e.g. look-up-table

Definitions

  • the present disclosure relates to the field of communications, for example, to a feedback channel online calibration method and apparatus capable of improving base station output power accuracy.
  • the output power of the antenna port changes continuously with changes in frequency and temperature.
  • the larger the frequency and temperature change the greater the change of the gain.
  • the downlink channel of the base station will cause the output power accuracy to decrease, affecting the coverage area;
  • the channel will cause the power detection accuracy to drop, affecting the plastics of the user's uplink data service. Therefore, in order to ensure that the base station operates at different frequencies and different temperatures, the gain of each channel remains constant, and power calibration can be performed.
  • the calibration of the output power of the base station includes frequency calibration and temperature calibration. Both calibration methods are implemented by calibrating the feedback channel, that is, the power value read by the feedback channel is used as the power value converted to the antenna port, and the feedback channel is read. The difference between the power value and the actual power value transmitted by the base station is the calibration data.
  • frequency calibration can be performed. In the production process, the calibration data of each base station at different frequencies is tested, a set of calibration data is obtained, and then written into the memory of the base station. For the call; when the ambient temperature changes, the gain characteristics of the base station will also change, so that the above calibration data in the base station is no longer applicable.
  • the temperature calibration is performed after the frequency calibration, that is, by performing high and low temperature on the sample base station. Test to extract calibration data and write it to the base station registers for recall.
  • the frequency calibration table can be used to compensate the temperature of the uncalibrated base station to ensure the temperature compensation.
  • the base station output power is constant.
  • the temperature compensation scheme in the related art is to obtain the temperature characteristics of the sample base station, and then write the calculated temperature calibration data into the same type of base station.
  • this temperature calibration data does not necessarily fit all base stations, resulting in inaccurate temperature calibration.
  • the temperature characteristics of the base station's RF device will also change, but the calibration data stored in the register will not be updated as its temperature characteristics change, which leads to The accuracy of the base station's output power over time will also decrease.
  • the present disclosure provides a method and apparatus for online calibration of a feedback channel, which can provide a constant reference power to a feedback channel of a base station, and can perform real-time online calibration of the feedback channel when the base station ambient temperature changes and the base station aging. Improve the accuracy of the base station's reflected power.
  • the present disclosure provides a method for online calibration of a feedback channel, including:
  • the feedback channel is subjected to real-time online calibration according to the current power value of the feedback channel and the original calibration data.
  • an embodiment of the present disclosure further provides a feedback channel online calibration apparatus, including:
  • a reference power output circuit configured to provide a constant reference power to the feedback channel
  • a real-time data acquisition circuit configured to acquire, in real time, a current power value of a feedback channel that accesses the constant reference power under current operating conditions
  • a circuit configured to call a pre-stored original calibration table according to a current working frequency point in the current working condition to obtain original calibration data corresponding to the current working frequency point;
  • a calibration circuit is configured to perform real-time online calibration of the feedback channel based on the raw calibration data and a current power value of the feedback channel.
  • the output reference power value does not change with the temperature change, thereby ensuring the accuracy of the feedback channel power, thereby ensuring the accuracy of the base station transmit power, and at the same time,
  • the on-line temperature calibration is performed on the base station transmit channel, so that the transmit power does not change with the aging of the base station, so that the base station transmit power can be kept accurate for a long time.
  • the technical solution provided by the present disclosure enables the base station to complete temperature calibration at normal temperature without performing high and low temperature cycle experiments.
  • the device provided by the embodiment of the present disclosure is an analog circuit, and the cost is low.
  • Embodiment 1 is a flow chart of Embodiment 1 of a feedback channel online calibration method of the present disclosure
  • FIG. 2 is a flow chart of a second embodiment of a method for online calibration of a feedback channel according to the present disclosure
  • FIG. 3 is a functional diagram of an embodiment of a feedback channel online calibration apparatus of the present disclosure
  • FIG. 4 is a connection diagram of a reference power output circuit and a feedback channel in a feedback channel online calibration apparatus according to the present disclosure
  • Figure 5 is a circuit schematic diagram of the reference power output circuit of Figure 3.
  • Figure 6 is a circuit schematic of the reference voltage source of Figure 3.
  • the disclosure obtains the calibration difference between the current condition and the original calibration condition in the working gap of the feedback channel, and calibrates the feedback channel online, so that the feedback channel can ensure the accuracy of the inspection under different working environments, and the output power of the base station is the power through the feedback channel. Calibrate to adjust the transmit channel power and improve the base station output power accuracy.
  • FIG. 1 is a flowchart of Embodiment 1 of a method for online calibration of a feedback channel according to the present disclosure.
  • step 110 the current power value of the feedback channel accessing the constant reference power under the current operating conditions is obtained in real time.
  • the current working condition is relative to the original working condition.
  • the original working conditions refer to the environment in which the base station is in line calibration, such as the operating frequency, operating temperature, and so on.
  • the operating frequency and operating temperature of the base station will change during the operation of the base station, which will also affect the power value of the feedback channel. Therefore, the current condition of the base station, that is, the current working frequency point, and the current power value at the current operating temperature can be obtained. And then perform real-time online calibration based on the current power value.
  • the performing power constant processing may include:
  • the reference power output from the frequency source is input to the power splitter, and the power outputted from one output end of the power splitter is coupled to the detector to convert the output power of the output of the power splitter into a first DC voltage, the first direct current
  • the voltage is amplified by a logarithmic amplifier to obtain a second DC voltage, and the second DC voltage is compared with a reference voltage output by the reference voltage source in an integral comparator, and the compared signal is processed by the power attenuator to output a constant reference power.
  • the method may further include step 140 before acquiring the current power value of the feedback channel that accesses the constant reference power in real time under current operating conditions.
  • the feedback channel that accesses the constant reference power is pre-calibrated to obtain the original calibration table.
  • the line calibration is performed on the feedback channel that accesses the constant reference power in advance, and obtaining the original calibration table includes:
  • Corresponding to the original calibration table is generated according to the frequency compensation value corresponding to the different operating frequency points, the power value of the feedback channel, and the operating temperature value.
  • frequency calibration is performed on a feedback channel that is connected to a constant reference power, and frequency compensation values corresponding to different working frequency points are obtained.
  • frequency calibration is performed on the base stations at different working frequencies to obtain a set of original calibration data: a working frequency point Freq, and a frequency compensation value P cal1 corresponding to the working frequency point Freq.
  • the original calibration table includes a plurality of working frequency points corresponding to each working frequency point.
  • the frequency compensation value P cal1 corresponds to the operating temperature of each working frequency point, as well as the feedback channel power value, etc., see Table 1.
  • step 120 the pre-stored original calibration table is called according to the current operating frequency of the base station, and the original calibration data corresponding to the current working frequency point is obtained.
  • step 130 the feedback channel is subjected to real-time online calibration according to the current power value of the feedback channel and the original calibration data.
  • the feedback channel is connected to a constant reference power that does not change with temperature change, thereby ensuring the accuracy of the feedback channel power, thereby ensuring base station transmission.
  • the accuracy of the power at the same time, enables online temperature calibration of the base station transmit channel, so that the base station transmit power does not change with the aging of the base station, that is, the base station transmit power can be kept accurate for a long time;
  • the temperature calibration is completed at normal temperature, and high and low temperature cycle experiments are not required, thereby reducing production costs and saving resources.
  • Embodiment 2 is a flow chart of Embodiment 2 of the online channel calibration method of the present disclosure.
  • a UMTS 2140 MHz base station with a rated output power of P is used, and the local oscillator of the base station serves as a frequency source, that is, the local oscillator source can provide a signal between 2110 MHz and 2170 MHz separated by 200 KHz.
  • step 210 the reference power of the access feedback channel is subjected to power constant processing to obtain a constant reference power and is connected to the feedback channel.
  • a reference power output circuit and a single-pole triple-throw switch SP3T are provided between the base station local oscillator (ie, the frequency source) and the primary set receiving PRX of the base station.
  • the first DC voltage signal is in an exponential relationship with the input power of the detector diode, and the first DC voltage is amplified by a logarithmic amplifier to obtain a second DC voltage. , the second DC voltage is followed by the input function of the detector diode
  • step 220 the current operating frequency is set to 2110 MHz at normal temperature.
  • step 230 a feedback channel coupled forward power value P tcpw1 and a base station output power P out are obtained .
  • the single-pole three-throw electronic switch SP3T can be switched to the forward channel, the feedback channel coupled forward power value P tcpw1 is read, and the base station output power P out is read by the meter.
  • step 240 the frequency compensation value is calculated based on the feedback channel coupling forward power value and the reference output power, and stored.
  • step 250 the power value of the feedback channel, and the current operating temperature value are obtained and stored.
  • the single-pole three-throw electronic switch SP3T can be switched to the reference channel, and the current power value of the feedback channel is read as B 1 , and the current operating temperature is obtained as T 1 and written into the register of the base station.
  • step 260 the operating frequency point is switched according to a preset frequency interval, and steps 230-260 are performed until the operating frequency point is 2170 MHz, and the original calibration table, that is, Table 2 is obtained.
  • the operating temperature of the base station operating frequency point of 2140MHz is T181.
  • the operating temperature corresponding to the base station operating frequency of 2140 MHz will not stay at T181 all the time, that is, the operating temperature of the base station changes.
  • the operating temperature changes T' therefore, if real-time online calibration is performed, the current power value of the feedback channel can be obtained, thereby performing real-time online calibration according to the original calibration data of the original standard table, that is, step 270 is performed.
  • step 270 under the current conditions, the current power value of the feedback forward channel and the current power value of the feedback channel are obtained.
  • the current condition is the current operating frequency of 2140 MHz and the current operating temperature is T'.
  • the operating frequency is 2140MHz
  • the corresponding operating temperature is T 181 , thereby, it can be seen that the operating temperature of the base station has changed, optionally, the single-pole three-throw switch SP3T Switch to the feedback forward channel, read the feedback channel coupled forward power value P tcpw ; switch the single-pole three - throw switch SP3T to the reference channel and read the feedback channel power value B'.
  • step 280 the original calibration table is called to obtain a frequency compensation value A 181 and a feedback channel power reading B 181 corresponding to the current working frequency point of 2140 MHz , and the base station output power value is calculated as P tcpw +A 181 +B'-B. 181 .
  • the temperature calibration is performed online when the base station ambient temperature changes and the base station is aging, which improves the accuracy of the transmission power.
  • the above method is also applicable to the operating frequency points other than 2140 MHz.
  • the online calibration apparatus in this embodiment includes a reference power output circuit 31, a data real-time acquisition circuit 32, a call circuit 33, and a calibration circuit 34.
  • the reference power output circuit 31 is arranged to provide a constant reference power to the feedback channel.
  • the reference power output circuit 31 includes: a frequency source that provides a reference input power (in one embodiment, the frequency source can adopt a local oscillator of the base station), a reference voltage source that provides a reference voltage, and a control switch that selects the channel.
  • SP3T in one embodiment, the control switch is a single-pole, three-throw switch
  • a power attenuating sub-circuit that provides a constant reference power to the base station feedback channel.
  • two input ends of the power attenuating sub-circuit are respectively electrically connected to the foregoing frequency source and a reference voltage source, and an output end of the power attenuating sub-circuit is electrically connected to a first control end of the control switch, the control switch The output end is externally connected to the main set receiving circuit PRX of the base station, and the second and third control ends of the control switch are respectively connected to the forward channel and the reverse channel of the feedback channel;
  • the data real-time acquisition circuit 32 is configured to acquire the current condition parameter of the base station, and obtain the current power value of the feedback channel accessing the constant reference power under the current condition in real time.
  • the current working condition is relative to the original working condition, and the original working condition refers to an environment in which the base station is in line calibration, such as a working frequency, an operating temperature, and the like.
  • the actual operating frequency and actual operating temperature of the base station will change during the operation of the base station, which will also affect the power value of the feedback channel. Therefore, the current condition of the base station, that is, the current working frequency point, and the current power at the current operating temperature are obtained. Value, real-time online calibration based on the pre-operating frequency and current power values.
  • the data real-time acquisition circuit 32 can be implemented using a power meter.
  • the calling circuit 33 is connected to the data real-time collecting circuit 32, and is configured to call the original calibration corresponding to the current working frequency point in the original calibration table pre-stored in the base station according to the current working frequency point in the acquired current condition parameter. data.
  • a calibration circuit 34 coupled to the calling circuit 33, configured to perform real-time online calibration of the feedback channel based on the original calibration data and a current power value of the feedback channel, and to set a line calibration for the base station in advance , get the original calibration table.
  • the power attenuating sub-circuit may include: a power splitter, a detector, a logarithmic amplifier, an integrating comparator, and a power attenuator, wherein
  • the first input end of the power attenuator is externally connected to the frequency source, and the output end of the power attenuator is electrically connected to the input end of the power splitter, and the first output end of the power splitter is electrically connected to the first control end of the control switch
  • the second and third control terminals of the control switch are respectively connected to a forward channel of the feedback channel (ie, an output end of the coupler) and a reverse channel (ie, a node between the circulator and the load attenuator in the feedback channel),
  • the output of the control switch is electrically connected to the main set of the base station to receive the PRX;
  • the second output of the splitter is electrically coupled to the first input of the integrating comparator via the detector and the log amp, the output of the integrating comparator being electrically coupled to the second input of the power attenuator,
  • the second input of the integral comparator is externally connected to the reference voltage source.
  • the reference voltage source comprises: a high-drop Low Drop-Out Voltage Regulator (LDO) and a Digital to Analog Converter (DAC) connected in series. And a voltage follower, wherein the LDO external power supply, the output of the voltage follower is electrically connected to the input end of the reference power output circuit.
  • LDO Low Drop-Out Voltage Regulator
  • DAC Digital to Analog Converter
  • the high precision LDO converts the 5.5V supply voltage in the base station to a 5V voltage with an accuracy of ⁇ 0.1%.
  • the input voltage is input to the 16Bit bit DAC, and the DAC output voltage is DATA. Adjust when the data bit is At 1111111111111111, the DAC output voltage is 2.5V, and the voltage follower outputs a stable reference voltage Vref of 2.5V input to the comparator.
  • the reference power P1 couples a part of the power to the detector through the power splitter in the power attenuating sub-circuit, and utilizes the characteristics of the detector.
  • the power signal is converted into a first DC voltage, and the first DC voltage is exponentially related to the input power of the detector.
  • the first DC voltage is amplified by a logarithmic amplifier to obtain a second DC voltage, and the second DC voltage is proportional to the input power of the detector.
  • the comparison signal after the second DC voltage is compared with the reference voltage in the integral comparator is input to the power attenuator.
  • the reference power input P1 changes accordingly.
  • the DC voltage of the input power attenuator also changes. Accordingly, since the attenuation of the power attenuator will vary with the input voltage, Therefore, when the reference power input P1 changes, the power attenuation amount of the power attenuator also changes, thereby ensuring that the reference power P2 after the power splitter does not change with temperature.
  • the technical solution of the present disclosure can construct a reference power output circuit through an analog circuit, and connect the constant reference power outputted by the reference power output circuit to the feedback channel of the base station, thereby ensuring the accuracy of the feedback channel power, thereby ensuring the base station transmit power.
  • the accuracy Since the reference power output circuit is built for analog circuits, the cost is low.
  • the online calibration apparatus of the present disclosure can also perform on-line temperature calibration of the base station transmission channel so that the transmission power does not change with the aging of the base station, so that the base station transmission power can be kept accurate for a long time.
  • the present disclosure enables the base station to perform temperature calibration at normal temperature without performing high and low temperature cycle experiments.
  • the present disclosure also provides a power control device capable of outputting constant power.
  • the structure and working principle of the power control device are the same as those of the reference power output circuit in the third embodiment, and the same components are provided with the same Figure mark.
  • the feedback channel online calibration method and device provided by the present disclosure can provide a constant reference power to a feedback channel of a base station, and can perform real-time online calibration of the feedback channel in the case of a base station ambient temperature change and a base station aging condition, thereby improving The accuracy of the base station's reflected power.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

本公开公开了一种反馈通道在线校准方法及装置。所述方法包括：实时获取接入恒定基准功率的反馈通道在当前工作条件下的当前功率值；根据基站当前工作条件中的当前工作频点调用预先存储的原始校准表，得到对应于所述当前工作频点的原始校准数据；以及根据所述反馈通道的当前功率值和所述原始校准数据，对所述反馈通道进行实时在线校准。

Description

反馈通道在线校准方法及装置 技术领域
本公开涉及通信领域，例如涉及一种能够提高基站输出功率精度的反馈通道在线校准方法及装置。
背景技术
在基站中，天线口的输出功率会随着频率、温度的变化而不断变化。在电路硬件结构不变的情况下，频率、温度改变越大，增益的变化就越大，而增益变化之后，对于基站的下行通道，会造成输出功率精度下降，影响覆盖区域；对于基站的上行通道，会造成功率检测精度下降，影响用户上行数据业务的塑料。因此，为了保证基站工作在不同频率、不同温度下，每个通道增益保持恒定，可以进行功率校准。
对基站输出功率的校准包括频率校准和温度校准，这两种校准方式均是通过校准反馈通道来实现的，即将反馈通道读取的功率值作为折算到天线口的功率值，而反馈通道读取的功率值与基站发射的实际功率值的差值即为校准数据。通常，为了保证基站在常温下增益的准确性，可以进行频率校准，即将在生产过程中，测试每一台基站在不同频率下的校准数据，得到一组校准数据，然后写入基站的存储器中以备调用；而当环境温度变化时，基站的增益特性也会发生变化，会使基站中的上述校准数据不再适用，因此，在频率校准后进行温度校准，即通过对样本基站做高低温试验，以提取校准数据，并写入基站寄存器中以备调用。然而，由于生产条件的限制，不可能对每一台基站在所有温度下进行校准，因此，为了保证频率校准值的准确性，可以采用频率校准表对未进行校准的基站进行温度补偿，以保证基站输出功率的恒定。
而相关技术中的温度补偿方案是通过获取样本基站的温度特性，然后将计算得到的温度校准数据写入相同型号基站中。但该温度校准数据并不一定适合所有基站，从而导致温度校准不准确。同时，在使用过程中，随着基站的老化，基站的射频器件的温度特性也将发送变化，但存储在寄存器中的校准数据却不会随着其温度特性的变化而进行更新，这就导致基站输出功率随着时间的变化精度也会随之下降。
发明内容
本公开提供一种反馈通道在线校准方法及装置，能够向基站的反馈通道提供一个恒定的基准功率，并且能够在基站环境温度变化以及基站老化的情况下，对反馈通道进行实时的在线校准，从而提高基站反射功率的精确度。
本公开提供了一种反馈通道在线校准方法，包括：
实时获取接入恒定基准功率的反馈通道在当前工作条件下的当前功率值；
根据基站当前工作条件中的当前工作频点调用预先存储的原始校准表，得到对应于所述当前工作频点的原始校准数据；以及
根据所述反馈通道的当前功率值和所述原始校准数据，对所述反馈通道进行实时在线校准。
相应地，本公开实施例还提供了一种反馈通道在线校准装置，包括：
基准功率输出电路，设置为向反馈通道提供恒定基准功率；
数据实时采集电路，设置为实时获取接入所述恒定基准功率的反馈通道在当前工作条件下的当前功率值；
调用电路，设置为根据当前工作条件中的当前工作频点调用预先存储的原始校准表，得到对应于所述当前工作频点的原始校准数据；以及
校准电路，设置为根据所述原始校准数据和所述反馈通道的当前功率值，对所述反馈通道进行实时在线校准。
本公开实施例提供的反馈通道在线校准方法及装置，输出的基准功率值不随温度的变化而变化，从而保证了反馈通道功率的精确性，进而保证了基站发射功率的精确性，同时，还可对基站发射通道进行在线温度校准，从而使得发射功率不会随着基站的老化而变化，使得基站发射功率可以长期保持精确。本公开提供的技术方案，使得基站可以在常温下完成温度校准，不需要进行高低温循环实验。本公开实施例提供的装置为模拟电路搭建，成本较低。
附图说明
为了更清楚地说明本公开实施例或相关技术中的技术方案，下面将对实施例或相关技术描述中所使用的附图作简单地介绍，显而易见地，下面描述中的 附图仅仅是本公开的一些实施例，还可以根据这些附图获得其他的附图。在不冲突的情况下，本公开的实施例和实施例中的特征可以相互任意组合。
图1是本公开的一种反馈通道在线校准方法的实施例一的流程图；
图2是本公开的一种反馈通道在线校准方法的一实施例二的流程图；
图3是本公开的一种反馈通道在线校准装置的一实施例的功能图；
图4是反应本公开的一种反馈通道在线校准装置中基准功率输出电路与反馈通道的连接关系图；
图5是图3中基准功率输出电路的电路原理图；以及
图6是图3中基准电压源的电路原理图。
具体实施方式
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。在不冲突的情况下，本公开中的实施例和实施例中特征可以相互任意组合。
本公开通过在反馈通道工作间隙，获取当前条件与原始校准条件的校准差值，在线校准反馈通道，使得反馈通道在不同工作环境下可以保证检查的准确性，而基站输出功率就是通过反馈通道功率校准，从而调整发射通道功率，提高基站输出功率精度。
实施例一
图1为本公开的一种反馈通道在线校准方法的实施例一的流程图。
在步骤110中，实时获取接入恒定基准功率的反馈通道在当前工作条件下的当前功率值。
本实施例中，该当前工作条件是相对于原始工作条件而言。原始工作条件是指基站在产线校准时所处的环境，如工作频点，工作温度等。然而，基站的工作频率和工作温度都会在基站工作过程中发生变化，这也将影响反馈通道的功率值，因此，可以获取基站当前条件，即当前工作频点，当前工作温度下的当前功率值，进而根据当前功率值进行实时在线校准。
本实施例中，在进行校准时，若直接将基站本振源接入反馈通道，但该本 振源也将随温度的变化而变化，因此，为了提高精度，本实施例中，向该反馈通道中接入恒定基准功率，即将频率源和基准电压源经过功率恒定处理后接入该反馈通道。在一实施例中，该进行功率恒定处理可以包括：
将频率源输出的参考功率输入功分器，将该功分器的一个输出端输出的功率耦合至检波器使所述功分器的输出端输出的功率转换为第一直流电压，第一直流电压经对数放大器放大得到第二直流电压，所述第二直流电压与基准电压源输出的基准电压在积分比较器中进行比较，比较后的信号经功率衰减器处理后输出恒定基准功率。
在一实施例中，在实时获取接入恒定基准功率的反馈通道在当前工作条件下的当前功率值之前，所述方法还可以包括步骤140。在步骤140中，预先对所述接入恒定基准功率的反馈通道进行产线校准，获取原始校准表。可选地，所述预先对所述接入恒定基准功率的反馈通道进行产线校准，获取原始校准表包括：
在常温下，对接入恒定基准功率的反馈通道进行频率校准，获得对应于不同工作频点的频率补偿值；
获取不同工作频点条件下的反馈通道的功率值，以及对应的工作温度；以及
根据对应于不同工作频点的频率补偿值、反馈通道的功率值和工作温度值生成对应于原始校准表。
其中，在常温下，对接入恒定基准功率的反馈通道进行频率校准，获得对应于不同工作频点的频率补偿值，在实施时，可以根据每个基站对应的工作频段，按照一定的频率间隔，对不同的工作频点下的基站进行频率校准，从而得到一组原始校准数据：工作频点Freq、对应于该工作频点Freq的频率补偿值Pcal1。
根据对应于不同工作频点的频率补偿值、反馈通道的功率值和工作温度值生成对应于原始校准表，在实施时，该原始校准表包括多个工作频点，与每个工作频点对应的频率补偿值Pcal1，对应于每个工作频点的工作温度，以及反馈通道功率值等，参见表1。
表1
Freq Pcal1 Pcal2 Temp
F1 A1 B1 T1
F2 A2 B2 T2
F3 A3 B3 T3
. . . .
. . . .
. . . .
Fn An Bn Tn
在步骤120中，根据基站当前工作频点调用预先存储的原始校准表，得到对应于当前工作频点的原始校准数据。
在步骤130中，根据所述反馈通道的当前功率值和所述原始校准数据，对所述反馈通道进行实时在线校准。
本实施例中，通过对接入反馈通道的参考功率进行恒定功率处理，使得反馈通道接入一个不随温度变化而变化的恒定基准功率，从而保证了反馈通道功率的精确性，进而保证了基站发射功率的精确性，同时，还使得可对基站发射通道进行在线温度校准，从而使得基站发射功率不会随着基站的老化而变化，即使得基站发射功率可以长期保持精确；以及还可使得基站在常温下完成温度校准，不需要进行高低温循环实验，进而降低了生产成本，也节约了资源。
实施例二
图2为本公开的反馈通道在线校准方法的实施例二的流程图。本实施例中，采用额定输出功率为P的UMTS 2140MHz基站，该基站的本振作为频率源，即该本振源可提供一个2110MHz-2170MHz之间，相隔200KHz的信号。
在步骤210中，对接入反馈通道的参考功率进行功率恒定处理，得到恒定基准功率，并接入反馈通道中。
在一实施例中，如图4所示，通过在基站本振(即频率源)与基站的主集接收PRX之间设置一个基准功率输出电路和一个单刀三掷开关SP3T。如图5所示，频率源的参考输入功率P1＝0dBm输出到功率衰减器(由多个串联的PIN(Positive-Intrinsic-Negative)二极管组成)，通过功分器将一部分功率耦合到检波器(由检波二极管组成)，利用检波二极管特性，将功率信号转换为第一直流电压，第一直流电压信号跟检波二极管输入功率成指数关系，第一直流电压经过对数放大器放大后得到第二直流电压，第二直流电压就跟检波二极管输入功 率成正比，第二直流电压与基准电压Vref在积分比较器中进行比较后的输出信号输入到功率衰减器中。即使当温度变化时，参考功率输入P1随之变化，输入PIN二极管的直流电压也会变化，PIN二极管的功率衰减量也会随之变化，从而保证了功分器后的基准功率P2不随温度的变化而变化，得到基准功率值P2＝-10dBm，经过单刀三掷开关SP3T后输入到反馈通道中。
在步骤220中，常温下，设置当前工作频点为2110MHz。
在步骤230中，获取反馈通道耦合前向功率值Ptcpw1和基站输出功率Pout。
在一实施例中，可以将单刀三掷电子开关SP3T切换到前向通道，读取反馈通道耦合前向功率值Ptcpw1，通过仪表读取基站输出功率Pout。
在步骤240中，根据该反馈通道耦合前向功率值和基准输出功率计算频率补偿值，并存储。
在一实施例中，该频率补偿值可以为A1＝Pout-Ptcpw1。
在步骤250中，获取反馈通道的功率值，和当前工作温度值，并存储。
在一实施例中，可以将单刀三掷电子开关SP3T切换到基准通道，读取反馈通道当前的功率值为B1，同时，获取当前的工作温度为T1，并写入基站的寄存器中。
在步骤260中，按照预设的频率间隔切换工作频点，并执行步骤230-260直至到工作频点为2170MHz，得到原始校准表，即表2。
表2
Freq(MHz) Pcal1 Pcal2 Temp
2110 A1 B1 T1
2110.2 A2 B2 T2
2110.4 A3 B3 T3
. . . .
2140 A181 B181 T181
. . . .
. . . .
2170 An Bn Tn
参见表2，理想状态下，基站工作频点2140MHz对应的工作温度为T181， 但由于电子器件本身发热，或者老化，或者环境等原因，工作一段时间后，基站工作频点2140MHz对应的工作温度不会一直停留在T181，也就是说，基站的工作温度发生了变化，此时的工作温度变化T‘，因此，若进行实时在线校准，可以获取反馈通道当前功率值，从而根据原始标准表的原始校准数据进行实时在线校准，即执行步骤270。
在步骤270中，当前条件下，获取反馈前向通道的当前功率值和反馈通道的当前功率值。
在一实施例中，令该当前条件为当前工作频点2140MHz，当前工作温度为T‘。由表2可知，在原始校准表中，当工作频点为2140MHz时，对应的工作温度为T181，由此，可知，基站的工作温度发生了变化，可选地，将单刀三掷开关SP3T切换至反馈前向通道，读取反馈通道耦合前向功率值Ptcpw；将单刀三掷开关SP3T切换至基准通道，读取反馈通道功率值为B’。
在步骤280中，调用原始校准表，得到对应于当前工作频点为2140MHz的频率补偿值A181与反馈通道功率读值B181，算得基站输出功率值为Ptcpw+A181+B’-B181。
在基站环境温度变化以及基站老化的时候在线做温度校准，提高了发射功率的精确度。除2140MHz之外的工作频点同样适用上述的方法。
实施例三
图3为本公开的反馈通道在线校准装置的一实施例的功能图。本实施例中该在线校准装置包括：基准功率输出电路31、数据实时采集电路32、调用电路33以及校准电路34。
参见图5，基准功率输出电路31设置为向反馈通道提供恒定基准功率。可选地，该基准功率输出电路31包括：提供参考输入功率的频率源(在一实施例中，该频率源可采用基站的本振)，提供基准电压的基准电压源，选择通道的控制开关SP3T(在一具体实施例中，该控制开关为单刀三掷开关)，以及向基站反馈通道提供恒定基准功率的功率衰减子电路。参见图4，该功率衰减子电路的两个输入端分别与前述的频率源和基准电压源电连接，该功率衰减子电路的输出端与该控制开关的第一控制端电连接，该控制开关的输出端外接至基站的主集接收电路PRX，该控制开关的第二、三控制端分别连接至该反馈通道的前向通道和反向通道；
数据实时采集电路32设置为获取基站的当前条件参数，并实时获取接入恒定基准功率的反馈通道在当前条件下的当前功率值。本实施例中，该当前工作条件是相对于原始工作条件而言，该原始工作条件是指基站在产线校准时所处的环境，如工作频点，工作温度等。然而，基站的实际工作频率和实际工作温度都会在基站工作过程中发生变化，这也将影响反馈通道的功率值，因此，获取基站当前条件，即当前工作频点，当前工作温度下的当前功率值，根据前工作频点和当前功率值进行实时在线校准。在一实施例中，该数据实时采集电路32可采用功率计来实现。
调用电路33，与该数据实时采集电路32相连，设置为根据所获取的当前条件参数中的当前工作频点，调用基站中预先存储的原始校准表中对应于所述当前工作频点的原始校准数据。
校准电路34，与该调用电路33相连，设置为根据所述原始校准数据和所述反馈通道的当前功率值，对所述反馈通道进行实时在线校准，以及设置为预先对该基站进行产线校准，获取原始校准表。
在一实施例中，参见图5，该功率衰减子电路可以包括：功分器，检波器，对数放大器，积分比较器，和功率衰减器，其中，
该功率衰减器的第一输入端外接上述频率源，该功率衰减器的输出端与功分器的输入端电连接，该功分器的第一输出端与控制开关的第一控制端电连接，该控制开关的第二、三控制端分别外接至反馈通道的前向通道(即耦合器的一个输出端)和反向通道(即反馈通道中环形器与负载衰减器之间的节点)，而该控制开关的输出端则与基站的主集接收PRX电连接；且
该功分器的第二输出端通过该检波器和对数放大器与积分比较器的第一输入端电连接，该积分比较器的输出端与所述功率衰减器的第二输入端电连接，该积分比较器的第二输入端外接该基准电压源。
在一实施例中，参见图6，该基准电压源包括：依次串联的高精度低压差线性稳压器(Low Drop-Out Voltage Regulator，LDO)，数模转换器(Digital to analog converter，DAC)和电压跟随器，其中，LDO外接电源，电压跟随器的输出端则与上述的基准功率输出电路的输入端电连接。可选地，该高精度LDO将基站中5.5V供电电压转换为精度为±0.1％的5V电压，在经过分压分到2.5V后，输入到16Bit位DAC中，DAC输出电压为可通过DATA调节，当数据位为 1111111111111111时，DAC输出电压为2.5V，再经过电压跟随器输出一个稳定的基准电压Vref为2.5V输入到比较器中。
本实施例中，当频率源输出一个参考功率P1到功率衰减子电路，则该参考功率P1通过该功率衰减子电路中的功分器将一部分功率耦合到检波器，利用检波器的特性，将功率信号转换为第一直流电压，第一直流电压跟检波器输入功率成指数关系，第一直流电压经过对数放大器放大得到第二直流电压，第二直流电压就跟检波器输入功率成正比，第二直流电压与基准电压在积分比较器中进行比较后的比较信号输入到功率衰减器中。当温度变化时，参考功率输入P1随之变化，由于装置特性，因此，输入功率衰减器的直流电压也会变化，相应地，由于该功率衰减器的衰减量将随输入电压的变化而变化，因此，当参考功率输入P1变化时，该功率衰减器的功率衰减量也会随之变化，从而保证了功分器后的基准功率P2不随温度的变化而变化。
本公开的技术方案可以通过模拟电路搭建一个基准功率输出电路，并将基准功率输出电路输出的恒定基准功率接入基站反馈通道中，从而保证了反馈通道功率的精确性，进而保证了基站发射功率的精确性。由于基准功率输出电路为模拟电路搭建，成本较低。
另一方面，本公开的该在线校准装置还可对基站发射通道进行在线温度校准，从而使得发射功率不会随着基站的老化而变化，使得基站发射功率可以长期保持精确。同时，本公开使得基站可以在常温下完成温度校准，不需要进行高低温循环实验。
实施例四
本公开还提供了一种能够输出恒定功率的功率控制装置，该功率控制装置的结构和工作原理与上述实施例三中的基准功率输出电路的结构和工作原理相同，相同的部件采用相同的附图标记。
工业实用性
本公开提供的反馈通道在线校准方法及装置，能够向基站的反馈通道提供一个恒定的基准功率，并且能够在基站环境温度变化以及基站老化的情况下，对反馈通道进行实时的在线校准，从而提高基站反射功率的精确度。

Claims (14)

  1. 一种反馈通道在线校准方法，包括：
    实时获取接入恒定基准功率的反馈通道在当前工作条件下的当前功率值；
    根据基站当前工作条件中的当前工作频点调用预先存储的原始校准表，得到对应于所述当前工作频点的原始校准数据；以及
    根据所述反馈通道的当前功率值和所述原始校准数据，对所述反馈通道进行实时在线校准。
  2. 如权利要求1所述的反馈通道在线校准方法，其中，所述恒定基准功率是通过对接入反馈通道中的参考功率进行功率恒定处理后得到的。
  3. 如权利要求2所述的反馈通道在线校准方法，其特征在于，所述对接入反馈通道中的参考功率进行功率恒定处理，得到恒定基准功率，包括：
    将频率源输出的参考功率输入功分器，将所述功分器的一个输出端输出的功率耦合至检波器使所述功分器的输出端输出的功率转换为第一直流电压，所述第一直流电压经对数放大器放大得到第二直流电压，所述第二直流电压与所述基准电压源输出的基准电压在积分比较器中进行比较，比较后的信号经功率衰减器处理后输出恒定基准功率。
  4. 如权利要求1所述的反馈通道在线校准方法，在所述实时获取接入恒定基准功率的反馈通道在当前工作条件下的当前功率值之前，所述方法还包括：
    预先对所述接入恒定基准功率的反馈通道进行产线校准，得到原始校准表。
  5. 如权利要求4所述的反馈通道在线校准方法，其中，所述预先对所述接入恒定基准功率的反馈通道进行产线校准，得到原始校准表，包括：
    在常温下，对所述接入恒定基准功率的所述反馈通道进行频率校准，获得对应于不同工作频点的频率补偿值；
    获取不同工作频点条件下的所述反馈通道的功率值以及对应的工作温度； 以及
    根据对应于所述不同工作频点的频率补偿值、反馈通道的功率值和工作温度值生成对应的原始校准表。
  6. 一种反馈通道在线校准装置，包括：
    基准功率输出电路，设置为向反馈通道提供恒定基准功率；
    数据实时采集电路，设置为实时获取接入所述恒定基准功率的反馈通道在当前工作条件下的当前功率值；
    调用电路，设置为根据当前工作条件中的当前工作频点调用预先存储的原始校准表，得到对应于所述当前工作频点的原始校准数据；以及
    校准电路，设置为根据所述原始校准数据和所述反馈通道的当前功率值，对所述反馈通道进行实时在线校准。
  7. 如权利要求6所述的反馈通道在线校准装置，其中，所述基准功率输出电路包括：频率源和基准电压源，控制开关，以及两个输入端分别与所述频率源和所述基准电压源电连接的功率衰减子电路，且所述功率衰减子电路的输出端还与所述控制开关的第一控制端电连接，所述控制开关的第二、三控制端分别外接至所述反馈通道的前向通道和反向通道，所述控制开关的输出端外接至所述基站的主集接收电路。
  8. 如权利要求7所述的反馈通道在线校准装置，其中，所述功率衰减子电路包括：功分器，检波器，对数放大器，积分比较器和功率衰减器，其中，
    所述功率衰减器的第一输入端外接所述频率源，所述功率衰减器的输出端与所述功分器的输入端电连接，所述功分器的第一输出端与所述控制开关的第一控制端电连接；所述功分器的第二输出端依次通过所述检波器和所述对数放大器与所述积分比较器的第一输入端电连接，所述积分比较器的输出端与所述 功率衰减器的第二输入端电连接，所述积分比较器的第二输入端外接所述基准电压源。
  9. 如权利要求8所述的反馈通道在线校准装置，其中，所述控制开关为单刀三掷开关。
  10. 如权利要求7所述的反馈通道在线校准装置，其中，所述基准电压源包括：依次串联的低压差线性稳压器LDO，数模转换器DAC和电压跟随器，其中，所述低压差线性稳压器LDO外接电源，所述电压跟随器的输出端与所述基准功率输出电路电连接。
  11. 一种输出恒定功率的功率控制装置，包括：
    频率源和基准电压源，控制开关，以及两个输入端分别与所述频率源和所述基准电压源电连接的功率衰减子电路，且
    所述功率衰减子电路的输出端还与所述控制开关的第一控制端电连接。
  12. 如权利要求11所述的功率控制装置，其中，所述功率衰减子电路包括：功分器，检波器，对数放大器，积分比较器，和功率衰减器，其中，
    所述功率衰减器的第一输入端外接所述频率源，所述功率衰减器的输出端与所述功分器的输入端电连接，所述功分器的第一输出端与所述控制开关的第一控制端电连接；所述功分器的第二输出端依次通过所述检波器和所述对数放大器与所述积分比较器的第一输入端电连接，所述积分比较器的输出端与所述功率衰减器的第二输入端电连接，所述积分比较器的第二输入端外接所述基准电压源。
  13. 如权利要求11或12所述的功率控制装置，其中，所述控制开关为单刀三掷开关。
  14. 如权利要求11或12所述的功率控制装置，其中，所述基准电压源包括： 依次串联的低压差线性稳压器LDO，数模转换器DAC和电压跟随器，其中，所述低压差线性稳压器LDO外接电源，所述电压跟随器的输出端与所述基准功率输出电路电连接。
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