WO2018161377A1 - 用于蓝牙发射功率校准的方法及装置 - Google Patents

用于蓝牙发射功率校准的方法及装置 Download PDF

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WO2018161377A1
WO2018161377A1 PCT/CN2017/078038 CN2017078038W WO2018161377A1 WO 2018161377 A1 WO2018161377 A1 WO 2018161377A1 CN 2017078038 W CN2017078038 W CN 2017078038W WO 2018161377 A1 WO2018161377 A1 WO 2018161377A1
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bluetooth
calibration
power
transmit power
channels
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PCT/CN2017/078038
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French (fr)
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全智
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深圳市中承科技有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/10—Monitoring; Testing of transmitters
    • H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
    • H04B17/102—Power radiated at antenna
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/10—Monitoring; Testing of transmitters
    • H04B17/11—Monitoring; Testing of transmitters for calibration
    • H04B5/70—

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  • the present invention relates to the field of Bluetooth signal calibration technology, and in particular, to a method and apparatus for Bluetooth transmit power calibration.
  • the transmission power of the Bluetooth module is affected by the unsatisfactory RF analog device.
  • the actual power of the receiving and transmitting terminals of the Bluetooth module needs to be accurate. calibration.
  • the Bluetooth module has a total of 79 channels. However, the calibration of all 79 Bluetooth channels is too expensive. Therefore, the current Bluetooth module transmit power calibration method firstly divides 79 channels into 5 groups, and each group takes the middle position. The channels are calibrated and the power calibration data calculated over these channels is applied to all channels in the group. For example, if 13.00 dBm is set as the transmit power, the measured actual transmit power of the first 16 channels and the resulting error are shown in Table 1. It can be seen that the power errors on different channels of the same group are not the same, which leads to The current Bluetooth module transmit power calibration method does not provide a sufficiently accurate calibration.
  • the present invention provides a method and apparatus for Bluetooth transmit power calibration that can improve the accuracy of algorithm calibration.
  • the present invention provides a method for Bluetooth transmit power calibration, comprising the following steps:
  • the line segments in the curve are grouped, and the appropriate starting and ending channels are selected for each group in the group, and recorded as the channel number n i , and the start and end of each line segment are measured.
  • the intercept calculation formula is as follows:
  • the power of the fitted transmit power is calibrated, and the specific calculation formula of the compensation error P offset-k is as follows:
  • k is the selected channel number
  • i is the group in which the selected channel is located
  • P out-k is the transmit power of the selected channel
  • P set is the standard transmit power of the channel.
  • the linear relationship between the transmission power of the Bluetooth and the channel number is used to group the line segments in the curve as follows:
  • Dynamic segmentation is used to select N channels for line segment grouping, and a total of N-1 packets are obtained.
  • each group of start and end channels in the packet is both ends of each line segment.
  • the present invention also provides an apparatus for Bluetooth transmit power calibration, the apparatus comprising a control computer and a radio frequency power meter, the control computer being connected to the radio frequency power meter for transmitting the instrument control signal to the radio frequency power meter and receiving the radio frequency
  • the test signal fed back by the power meter, the data communication between the RF power meter and the device to be calibrated is performed by Bluetooth, so that the RF power meter measures the Bluetooth signal of the device to be calibrated and returns the data to the control computer, and the control computer adopts the above-mentioned One of the methods described achieves calibration.
  • the method for Bluetooth transmit power calibration of the present invention comprises the steps of: grouping line segments in a curve according to a linear relationship between Bluetooth transmit power and channel number, and selecting an appropriate start and end channel for each group in the packet. And recording as the channel number n i , measuring the transmission power p i of the starting and ending channels of each line segment; calculating the slope a i and the intercept b i of each line segment; fitting the transmission power of all channels according to the line segment;
  • the combined transmit power is used for power calibration, so that the present invention can greatly improve the accuracy of the calibration algorithm without increasing the time complexity of the calibration algorithm compared with the prior art fixed grouping algorithm, thereby satisfying the higher accuracy. Production requirements and calibration requirements.
  • the device for Bluetooth transmit power calibration of the present invention comprises a control computer and a radio frequency power meter, wherein the control computer is connected to the radio frequency power meter for transmitting the instrument control signal to the radio frequency power meter and receiving the feedback of the radio frequency power meter feedback.
  • the RF power meter communicates with the device to be calibrated via Bluetooth, so that the RF power meter measures the Bluetooth signal of the device to be calibrated and returns the data to the control computer, and the control computer adopts any one of the above
  • the method realizes calibration, so that the present invention can greatly improve the accuracy of the calibration algorithm without increasing the time complexity of the calibration algorithm, thereby satisfying higher production requirements and calibration, compared with the prior art fixed grouping algorithm. Claim.
  • FIG. 1 is a flow chart of an example of a method provided by a method for Bluetooth transmit power calibration according to the present invention
  • FIG. 2 is a structural block diagram of an example provided by an apparatus for Bluetooth transmit power calibration according to the present invention
  • Figure 3 is a comparison of the results of the prior art fixed grouping algorithm and the method of the present invention.
  • a method for Bluetooth transmit power calibration includes the following steps:
  • Step 11 group the line segments in the curve according to the linear relationship between the transmission power of the Bluetooth and the channel number, and select an appropriate starting and ending channel for each group in the group, and record the channel number n i , and measure each line segment group.
  • Step 12 calculating a slope a i and an intercept b i of each line segment, where
  • the intercept calculation formula is as follows:
  • step 13 the transmit power of all channels is fitted according to the line segment, and the specific formula is as follows:
  • step 14 the matched transmission power is subjected to power calibration, and the specific calculation formula of the compensation error P offset-k is as follows:
  • k is the selected channel number
  • i is the group in which the selected channel is located
  • P out-k is the transmit power of the selected channel
  • P set is the standard transmit power of the channel.
  • the linear relationship between the transmission power of the Bluetooth and the channel number is used to group the line segments in the curve into:
  • Dynamic segmentation is used to select N channels for line segment grouping, and a total of N-1 packets are obtained.
  • each group of start and end channels in the group may be selected as two ends of each line segment.
  • the present invention also provides an apparatus for Bluetooth transmit power calibration, the apparatus comprising a control computer and a radio frequency power meter, the control computer being connected to the radio frequency power meter for transmitting the instrument control signal to the radio frequency a power meter, and receiving a test signal fed back by the RF power meter, wherein the RF power meter communicates with the device to be calibrated via Bluetooth, so that the RF power meter measures the Bluetooth signal of the device to be calibrated and returns the data to the control computer, and The calibration is performed by the control computer using the above method.
  • the traditional calibration algorithm divides these Bluetooth channels into 5 groups equally, and uses the channel in each group as the calibration channel.
  • the calibration data of the channel is applied to the channel in the whole group, the linear transmission relationship between the Bluetooth transmit power and the channel number, and the 9 dBm is set to the Bluetooth output power, the measured power, the linear fit, the improved distribution and the fixed packet.
  • FIG. 3 is a comparison result between the traditional fixed grouping algorithm and the power calibration algorithm of the present invention.
  • the improved algorithm reduces the mean square error, and the absolute error. It has been scaled down and the accuracy of the improved calibration algorithm has increased dramatically.
  • the improved algorithm reduces the mean square error by nearly 10 times, the absolute error is reduced to one-third, and the value is reduced from about 0.5 dB to less than 0.15 dB, improving the accuracy of the calibration algorithm. Significantly improved.
  • the invention establishes a mathematical model of the relationship between the Bluetooth channel and the transmission power of the Bluetooth module, and controls the transmission power calibration process through mathematical calculation results.
  • the appropriate number of dynamic packets are selected in the Bluetooth channel for grouping and the channel numbers separating the packets are determined, and the transmission power and error on the separated channels are calculated.
  • a line segment is calculated by the transmission power of two separate channels adjacent to the sequence number, and the transmission power of the channels between the separated channels is fitted according to the line segment, and then the error on each channel is calculated and calibrated.
  • the accuracy of the calibration method can be greatly improved without increasing the time complexity of the calibration algorithm.

Abstract

一种用于蓝牙发射功率校准的方法及装置，其中方法包括步骤：根据蓝牙的发射功率与信道序号的线性关系将曲线中的线段进行分组，并为分组中的每一组选择合适的起、终信道，且记录为信道序号ni，测量各线段分组起、终信道的发射功率pi；计算每条线段的斜率ai与截距bi；根据线段拟合出所有信道的发射功率；将拟合出的发射功率进行功率校准，本发明的用于蓝牙发射功率校准的方法及装置，相对于现有技术的固定分组算法，可在不提高校准算法的时间复杂度的前提下，可大幅提高校准算法的精确度，从而满足了更高地生产要求和校准要求。

Description

用于蓝牙发射功率校准的方法及装置 技术领域
本发明涉及蓝牙信号校准技术领域，具体涉及一种用于蓝牙发射功率校准的方法及装置。
背景技术
蓝牙模块的发射功率受不理想的射频模拟器件等影响，为了确保工厂硬件生产品质控制得到保证以及室内定位、导航等功能的准确性提高，需要对蓝牙模块的接收与发射端的实际功率进行准确的校准。
蓝牙模块共有79条信道，然而对全部79条蓝牙信道进行校准的代价太大，所以目前蓝牙模块发射功率校准方法在校准时，首先将79条信道平均分为5组，每一组取中间位置的信道进行校准，并将通过这些信道算出的功率校准数据应用到组里的全部信道。例如设置13.00dBm为发射功率，测得的第一组16条信道的实际发射功率以及所得误差如表一所示，由此可见，同组的不同信道上的功率误差并不相同，这就导致了目前的蓝牙模块发射功率校准方法并不能够提供足够精确的校准。
表一第一组各信道误差
信道序号 0 1 2 3 4 5 6 7
测量值/dBm 11.90 11.93 11.97 11.98 12.02 12.03 12.05 12.09
误差/dB 1.10 1.07 1.03 1.02 0.98 0.97 0.95 0.81
信道序号 8 9 10 11 12 13 14 15
测量值/dBm 12.11 12.13 12.17 12.19 12.22 12.10 12.12 12.14
误差/dB 0.89 0.87 0.83 0.81 0.78 0.90 0.88 0.86
因此，需要在不提高算法复杂度的前提下，提高算法校准准确度，改进蓝牙模块发射功率校准算法显得十分必要。
发明内容
本发明为了解决现有技术存在的上述问题，提供了一种能提高算法校准准确度的用于蓝牙发射功率校准的方法及装置。
实现上述目的，本发明提供了一种用于蓝牙发射功率校准的方法，包括如下步骤：
根据蓝牙的发射功率与信道序号的线性关系将曲线中的线段进行分组，并为分组中的每一组选择合适的起、终信道，且记录为信道序号ni，测量各线段分组起、终信道的发射功率pi；
计算每条线段的斜率ai与截距bi，其中，
斜率计算公式如下：
Figure PCTCN2017078038-appb-000001
截距计算公式如下：
bi＝pi-aini；
根据线段拟合出所有信道的发射功率，具体公式如下：
Pout-k＝aik+bi
将拟合出的发射功率进行功率校准，补偿误差Poffset-k的具体计算公式如下：
Poffset-k＝Pset-Pout-k
其中，k为所选信道序号，i为所选信道所在的组，Pout-k为所选信道的发射功率，Pset为该信道的标准发射功率。
作为本发明的进一步优选方案，将蓝牙的发射功率与信道序号的线性关系将曲线中的线段进行分组具体为：
采用动态分组选取N条信道进行线段分组，共得到N-1个分组。
作为本发明的进一步优选方案，所述N＝5或者N＝9。
作为本发明的进一步优选方案，分组中的每一组起、终信道为每条线段的两端。
本发明还提供了一种用于蓝牙发射功率校准的装置，该装置包括控制电脑和射频功率计，所述控制电脑与射频功率计相连，用于发送仪表控制信号给射频功率计，并接收射频功率计反馈的测试信号，所述射频功率计与待校准设备之间通过蓝牙进行数据通讯，使得射频功率计测量待校准设备的蓝牙信号并将数据返回给控制电脑，并由控制电脑采用上述任一项所述的方法实现校准。
本发明的用于蓝牙发射功率校准的方法，通过包括步骤：根据蓝牙的发射功率与信道序号的线性关系将曲线中的线段进行分组，并为分组中的每一组选择合适的起、终信道，且记录为信道序号ni，测量各线段分组起、终信道的发射功率pi；计算每条线段的斜率ai与截距bi；根据线段拟合出所有信道的发射功率；将拟合出的发射功率进行功率校准，使得本发明与现有技术的固定分组算法相比，在不提高校准算法的时间复杂度的前提下，可大幅提高校准算法的精确度，从而满足了更高地生产要求和校准要求。
本发明的用于蓝牙发射功率校准的装置，通过包括控制电脑和射频功率计，所述控制电脑与射频功率计相连，用于发送仪表控制信号给射频功率计，并接收射频功率计反馈的测试 信号，所述射频功率计与待校准设备之间通过蓝牙进行数据通讯，以使射频功率计测量待校准设备的蓝牙信号并将数据返回给控制电脑，并由控制电脑采用上述任一项所述的方法实现校准，使得本发明与现有技术的固定分组算法相比，在不提高校准算法的时间复杂度的前提下，可大幅提高校准算法的精确度，从而满足了更高地生产要求和校准要求。
附图说明
下面结合附图和具体实施方式对本发明作进一步详细的说明。
图1为本发明用于蓝牙发射功率校准的方法提供的一实例的方法流程图；
图2为本发明用于蓝牙发射功率校准的装置提供的一实例的结构框图；
图3为采用现有技术固定分组算法和采用本发明方法的结果对比图。
本发明目的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
下面将结合附图以及具体实施方式，对本发明做进一步描述。较佳实施例中所引用的如“上”、“下”、“左”、“右”、“中间”及“一”等用语，仅为便于叙述的明了，而非用以限定本发明可实施的范围，其相对关系的改变或调整，在无实质变更技术内容下，当亦视为本发明可实施的范畴。
图1为本发明用于蓝牙发射功率校准的方法提供的一实例的方法流程图，如图1所示，用于蓝牙发射功率校准的方法，包括以下步骤：
步骤11，根据蓝牙的发射功率与信道序号的线性关系将曲线中的线段进行分组，并为分组中的每一组选择合适的起、终信道，且记录为信道序号ni，测量各线段分组起、终信道的发射功率pi；
步骤12，计算每条线段的斜率ai与截距bi，其中，
斜率计算公式如下：
Figure PCTCN2017078038-appb-000002
截距计算公式如下：
bi＝pi-aini；
步骤13，根据线段拟合出所有信道的发射功率，具体公式如下：
Pout-k＝aik+bi
步骤14，将拟合出的发射功率进行功率校准，补偿误差Poffset-k的具体计算公式如下：
Poffset-k＝Pset-Pout-k
其中，k为所选信道序号，i为所选信道所在的组，Pout-k为所选信道的发射功率，Pset为该信道的标准发射功率。
具体实施中，将蓝牙的发射功率与信道序号的线性关系将曲线中的线段进行分组具体为：
采用动态分组选取N条信道进行线段分组，共得到N-1个分组。
具体实施中，所述N＝5或者N＝9，当然N还可以为其它具体数值，在此不做一一例举。
具体实施中，分组中的每一组起、终信道可选为每条线段的两端。
如图2所示，本发明还提供了一种用于蓝牙发射功率校准的装置，该装置包括控制电脑和射频功率计，所述控制电脑与射频功率计相连，用于发送仪表控制信号给射频功率计，并接收射频功率计反馈的测试信号，所述射频功率计与待校准设备之间通过蓝牙进行数据通讯，使得射频功率计测量待校准设备的蓝牙信号并将数据返回给控制电脑，并由控制电脑采用上述方法实现校准。
为了让本领域的技术人员更好地理解并实现本发明的技术方案，下面简述本实施例的工作原理。
以蓝牙信道(2402-2480MHz)以1MHz为间隔共被分为79条信道为例，目前传统校准算法将这些蓝牙信道平均分为5组，并将每组中间位置的信道作为校准信道，这条信道的校准数据被应用到整个组中的信道，其蓝牙的发射功率与信道序号之间大致程线性关系，并将9dbm设置为蓝牙输出功率时，实测功率、线性拟合、改进散发和固定分组四组数字如图三所示，为采用传统固定分组算法和本发明功率校准算法的结果对比图，传统固定分组算法和本发明功率校准算法相比，改进算法将均方误差降低了，绝对误差被缩小，且改进校准算法的准确度大幅提升。
本发明在实验室里，分别在三种不同的配置条件下，分别为1-DH5、3-DH5以及LE，采用均方误差(MSE)和标准误差(Std.Dev)来衡量系统的校准效果，结果如下表二所示：
均方误差 1-DH5 3-DH5 LE
校准前 4.5483 2.6685 1.9474
目前的校准算法 011123 0.1874 0.2241
改进的校准算法 0.0217 0.0178 0.0217
(a)均方误差对比表
绝对误差(dB) 1-DH5 3-DH5 LE
校准前 2.1327 1.6336 1.3955
目前的校准算法 0.3351 0.4329 0.4734
改进的校准算法 0.1473 0.1334 0.1473
(b)绝对误差对比表
表二、现有技术功率校准算法与改进校准算法的结果比较
从上述结果可以看出，改进算法将均方误差降低了将近10倍，绝对误差被缩小为原来的三分之一，其数值也从约0.5dB降到了小于0.15dB，改进校准算法的准确度大幅提升。
本发明将蓝牙信道与蓝牙模块发射功率的关系建立数学模型，通过数学计算结果控制发射功率校准过程。根据一定的硬件环境配置，在蓝牙信道选取合适的动态分组数目进行分组并确定分隔这些分组的信道序号，计算这些分隔信道上的发射功率和误差。通过序号相邻的两个分隔信道的发射功率计算出一条线段，根据这条线段拟合分隔信道之间的信道的发射功率，然后计算每条信道上的误差并校准。这样使得本实施例与现有技术固定分组算法相比，可在不提高校准算法的时间复杂度的前提下，大幅提高了校准方法的精确度。
虽然以上描述了本发明的具体实施方式，但是本领域熟练技术人员应当理解，这些仅是举例说明，可以对本实施方式做出多种变更或修改，而不背离本发明的原理和实质，本发明的保护范围仅由所附权利要求书限定。

Claims (5)

  1. 一种用于蓝牙发射功率校准的方法，其特征在于，包括如下步骤：
    根据蓝牙的发射功率与信道序号的线性关系将曲线中的线段进行分组，并为分组中的每一组选择合适的起、终信道，且记录为信道序号ni，测量各线段分组起、终信道的发射功率pi；
    计算每条线段的斜率ai与截距bi，其中，
    斜率计算公式如下：
    Figure PCTCN2017078038-appb-100001
    截距计算公式如下：
    bi＝pi-aini；
    根据线段拟合出所有信道的发射功率，具体公式如下：
    Pout-k＝aik+bi
    将拟合出的发射功率进行功率校准，补偿误差Poffset-k的具体计算公式如下：
    Poffset-k＝Pset-Pout-k
    其中，k为所选信道序号，i为所选信道所在的组，Pout-k为所选信道的发射功率，Pset为该信道的标准发射功率。
  2. 按照权利要求1所述的用于蓝牙发射功率校准的方法，其特征在于，将蓝牙的发射功率与信道序号的线性关系将曲线中的线段进行分组具体为：
    采用动态分组选取N条信道进行线段分组，共得到N-1个分组。
  3. 按照权利要求2所述的用于蓝牙发射功率校准的方法，其特征在于，所述N＝5或者N＝9。
  4. 按照权利要求1至3任一项所述的用于蓝牙发射功率校准的方法，其特征在于，分组中的每一组起、终信道为每条线段的两端。
  5. 一种用于蓝牙发射功率校准的装置，其特征在于，包括控制电脑和射频功率计，所述控制电脑与射频功率计相连，用于发送仪表控制信号给射频功率计，并接收射频功率计反馈的测试信号，所述射频功率计与待校准设备之间通过蓝牙进行数据通讯，使得射频功率计测量待校准设备的蓝牙信号并将数据返回给控制电脑，并由控制电脑采用权利要求1-4任一项所述的方法实现校准。
PCT/CN2017/078038 2017-03-10 2017-03-24 用于蓝牙发射功率校准的方法及装置 WO2018161377A1 (zh)

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