CN112636846A - WIFI product calibration test method - Google Patents
WIFI product calibration test method Download PDFInfo
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- CN112636846A CN112636846A CN202110041232.1A CN202110041232A CN112636846A CN 112636846 A CN112636846 A CN 112636846A CN 202110041232 A CN202110041232 A CN 202110041232A CN 112636846 A CN112636846 A CN 112636846A
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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Abstract
The invention relates to the technical field of detection, in particular to a WIFI product calibration test method, which comprises the following steps: A. matching POWER differences of the 11B mode, the 11N-20M mode, and the 11N-40M mode compared to the 11G mode, respectively; B. writing the difference values into a bin file; C. placing the bin file into a test instrument, and then starting the test instrument to work; D. calibrating the POWER value in the 11G mode of the bin file until the 11G calibration reaches the standard; E. the calibration values and bin file are written into the chip. According to the method, the modes in the bin file of the WIFI product are linked, and automatic calibration of other modes can be simultaneously realized through the 11B mode of the calibration base, so that the calibration test efficiency is improved.
Description
Technical Field
The invention relates to the technical field of detection, in particular to a WIFI product calibration test method.
Background
At present, electronic equipment such as a smart television, a mobile phone, a tablet personal computer and an all-in-one machine are generally implanted into a WIFI product, and in addition, the comprehensive coverage of a wireless network is realized, so that the WIFI networking is used anytime and anywhere, an essential part in the life of people is formed, and great convenience is brought to the life of people. However, in the manufacturing process of WIFI products, the WIFI chips need to be calibrated and tested, and the current calibration and test method basically needs to calibrate other modes after one mode is calibrated, which results in very low efficiency.
Disclosure of Invention
The invention provides a WIFI product calibration test method aiming at the problems in the prior art, which can efficiently finish calibration and test of WIFI products.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a WIFI product calibration test method, which comprises the following steps:
A. matching POWER differences of the 11B mode, the 11N-20M mode, and the 11N-40M mode compared to the 11G mode, respectively;
B. debugging bin files needing to be written into the chip according to the difference values;
C. placing the bin file into a test instrument, and then starting the test instrument to work;
D. calibrating the POWER value in the 11G mode of the bin file until the 11G calibration reaches the standard;
E. the calibration values and bin file are written into the chip.
Further, between steps D and E, a TX test is further included, specifically including:
x1. the main controller controls the emitter to send power radio frequency signal to the test instrument according to the instruction command, the test instrument calculates and returns the emission power to the main controller after receiving, the main controller judges whether the result reaches the required calibration range, if yes, step E is executed, otherwise, step X2 is executed;
x2. the master controls the transmitter to adjust the transmit power and then performs X1.
Further, between steps D and E, an error vector magnitude test is further included, specifically including:
detecting the initial position of the inclination and the transformation from the short sequence to the channel estimation sequence by the testing instrument;
driving a transmitter to transmit a radio frequency signal to the test instrument, the radio frequency signal comprising at least 20 dips, each dip comprising at least 16 OFDM symbols;
the testing instrument establishes accurate timing and carries out coarse frequency deviation skillful calculation and fine frequency deviation estimation operation on the signal;
performing rotation compensation according to the frequency offset value, and estimating a complex channel response coefficient for each transmission link and subcarrier;
converting each OFDM symbol into a subcarrier receiving value, and estimating a phase according to a pilot subcarrier of a spatial stream;
carrying out rotation speed compensation according to the obtained ingenious bit value, and forming a vector by each subcarrier value of all receiving links;
multiplying the obtained vector by an equalization matrix obtained by channel estimation, finding out the constellation point of each data-contained subcarrier closest to the resistance, calculating the Euclidean distance between the point and the ideal constellation point, and calculating the RMS mean value of all errors in a group of detection;
and calculating according to the RMS mean value to obtain an error vector magnitude, and adjusting according to the error vector magnitude.
Further, between steps D and E, a calibration value test is further included, which specifically includes:
testing the calibration value and judging whether the calibration value is in a specified test standard range;
carrying out spectrum template test on the standard value, and judging whether the standard value is in a specified test standard range;
and carrying out frequency deviation test on the standard value, and judging whether the standard value is in a specified test standard range.
Further, between step D and step E, an RX test is further included, specifically including:
connecting the output end of the test instrument to the input end of the transmitter;
the test instrument sends a radio frequency signal to the transmitter;
the transmitter calculates the packet error rate of the signal according to the radio frequency signal;
the test instrument adjusts the sending power according to the packet error rate until the packet error rate of the signal is below a set value, and the minimum sensitivity is obtained.
Further, the set value of the packet error rate of the signal is 10%.
Further, in step C, the method specifically includes:
C1. placing the bin file into a terminal, and connecting the terminal with a test instrument;
C2. connecting the DUT with a test instrument;
C3. and when the terminal acquires the DUT, controlling the test instrument to perform a test process.
The invention has the beneficial effects that: according to the method, the modes in the bin file of the WIFI product are linked, and automatic calibration of other modes can be simultaneously realized through the 11B mode of the calibration base, so that the calibration test efficiency is improved.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention. The present invention is described in detail below with reference to the attached drawings.
As shown in fig. 1, the calibration test method for the WIFI product provided by the present invention includes the following steps:
A. matching POWER differences of the 11B mode, the 11N-20M mode, and the 11N-40M mode compared to the 11G mode, respectively;
B. writing the difference values into a bin file;
C. placing the bin file into a test instrument, and then starting the test instrument to work;
D. calibrating the POWER value in the 11G mode of the bin file until the 11G calibration reaches the standard;
E. the calibration values and bin file are written into the chip.
After experiments, the WIFI chip of the MTK scheme is characterized in that the calibration values of the 11B mode, the 11N-20M mode and the 11N-40M mode are determined based on the difference of the calibration values of the 11G mode. Based on the characteristic, the difference values of the POWER values of the 11B mode, the 11N-20M mode and the 11N-40M mode are respectively matched with the POWER value of the 11B mode before calibration, so that when a worker calibrates, the POWER values of the 11B mode, the 11N-20M mode and the 11N-40M mode can be calibrated together only by calibrating the POWER value of the 11B mode, and the calibration efficiency is greatly improved.
The invention is illustrated below:
when the GAIN value is 06, the POWER value of 11G is 14db, the POWER value of 11B is also 14db, and the two have no difference; when the POWER value of 11B of the existing WIFI chip is required to be 16db, 11G is 14db, only the POWER value of 11G which is smaller than that of 11B is needed to be matched before calibration by 2db, namely, only the 11G mode needs to be adjusted to carry out calibration during calibration, the 11N-20M mode and the 11N-40M mode are set according to the mode, namely, only the 11B mode needs to be calibrated during calibration, after calibration is finished, bin files and calibration values are written into the chip together, and the POWER values of other three modes can be subjected to self-adaptive calibration in the chip according to difference values and the POWER value of the 11B mode.
In this embodiment, between steps D and E, a TX test is further included, which specifically includes:
x1. the main controller controls the emitter to send power radio frequency signal to the test instrument according to the instruction command, the test instrument calculates and returns the emission power to the main controller after receiving, the main controller judges whether the result reaches the required calibration range, if yes, step E is executed, otherwise, step X2 is executed;
x2. the master controls the transmitter to adjust the transmit power and then performs X1.
Namely, after the calibration is finished, the TX test is needed to be carried out, the transmitting power of the transmitter is calibrated, the bin file is tested under specific power, and the reliability of the test is ensured.
In this embodiment, the error vector magnitude needs to be calibrated to ensure that the output waveform magnitude and the theoretical magnitude error value are within a range, so as to ensure the stability of the output quantity. Specifically, between steps D and E, an error vector magnitude test is further included, specifically including:
detecting the initial position of the inclination and the transformation from the short sequence to the channel estimation sequence by the testing instrument;
driving a transmitter to transmit a radio frequency signal to the test instrument, the radio frequency signal comprising at least 20 dips, each dip comprising at least 16 OFDM symbols;
the testing instrument establishes accurate timing and carries out coarse frequency deviation skillful calculation and fine frequency deviation estimation operation on the signal;
performing rotation compensation according to the frequency offset value, and estimating a complex channel response coefficient for each transmission link and subcarrier;
converting each OFDM symbol into a subcarrier receiving value, and estimating a phase according to a pilot subcarrier of a spatial stream;
carrying out rotation speed compensation according to the obtained ingenious bit value, and forming a vector by each subcarrier value of all receiving links;
multiplying the obtained vector by an equalization matrix obtained by channel estimation, finding out the constellation point of each data-contained subcarrier closest to the resistance, calculating the Euclidean distance between the point and the ideal constellation point, and calculating the RMS mean value of all errors in a group of detection;
and calculating according to the RMS mean value to obtain an error vector magnitude, and adjusting according to the error vector magnitude.
In this embodiment, between steps D and E, a calibration value test is further included, which specifically includes:
testing the calibration value and judging whether the calibration value is in a specified test standard range;
carrying out spectrum template test on the standard value, and judging whether the standard value is in a specified test standard range;
and carrying out frequency deviation test on the standard value, and judging whether the standard value is in a specified test standard range.
In this embodiment, between step D and step E, an RX test is further included, which specifically includes:
connecting the output end of the test instrument to the input end of the transmitter;
the test instrument sends a radio frequency signal to the transmitter;
the transmitter calculates the packet error rate of the signal according to the radio frequency signal;
the test instrument adjusts the sending power according to the packet error rate until the packet error rate of the signal is below a set value, and the minimum sensitivity is obtained; specifically, the set value of the packet error rate of the signal is 10%.
In this embodiment, in step C, the method specifically includes:
C1. placing the bin file into a terminal, and connecting the terminal with a test instrument; specifically, the terminal installs corresponding test software before use, and the test software is used for reading bin files;
C2. connecting the DUT with a test instrument;
C3. and when the terminal acquires the DUT through the test instrument, controlling the test instrument to perform a test process.
In this embodiment, in step E, the calibration value and the bin file are written into the chip, and the calibration and the debugging result are both realized based on the above, and the written data includes the MAC address and the like in addition to the calibration value; after calibration is finished, because the test such as an RX test, a TX test, an amplitude vector test and the like is required, when all performance indexes are within the standard after the test, the terminal writes data into the chip; and if one performance index is not in the specified test standard range after the test is finished, the writing operation is not carried out on the chip until the performance index is calibrated, so that recalibration is avoided, and the efficiency is improved.
Although the present invention has been described with reference to the above preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A WIFI product calibration test method is characterized by comprising the following steps: the method comprises the following steps:
A. matching POWER differences of the 11B mode, the 11N-20M mode, and the 11N-40M mode compared to the 11G mode, respectively;
B. writing the difference values into a bin file;
C. placing the bin file into a test instrument, and then starting the test instrument to work;
D. calibrating the POWER value in the 11G mode of the bin file until the 11G calibration reaches the standard;
E. the calibration values and bin file are written into the chip.
2. The WIFI product calibration test method of claim 1, wherein: between steps D and E, a TX test is further included, specifically including:
x1. the main controller controls the emitter to send power radio frequency signal to the test instrument according to the instruction command, the test instrument calculates and returns the emission power to the main controller after receiving, the main controller judges whether the result reaches the required calibration range, if yes, step E is executed, otherwise, step X2 is executed;
x2. the master controls the transmitter to adjust the transmit power and then performs X1.
3. The WIFI product calibration test method of claim 1, wherein: between steps D and E, an error vector magnitude test is further included, specifically including:
detecting the initial position of the inclination and the transformation from the short sequence to the channel estimation sequence by the testing instrument;
driving a transmitter to transmit a radio frequency signal to the test instrument, the radio frequency signal comprising at least 20 dips, each dip comprising at least 16 OFDM symbols;
the testing instrument establishes accurate timing and carries out coarse frequency deviation skillful calculation and fine frequency deviation estimation operation on the signal;
performing rotation compensation according to the frequency offset value, and estimating a complex channel response coefficient for each transmission link and subcarrier;
converting each OFDM symbol into a subcarrier receiving value, and estimating a phase according to a pilot subcarrier of a spatial stream;
carrying out rotation speed compensation according to the obtained ingenious bit value, and forming a vector by each subcarrier value of all receiving links;
multiplying the obtained vector by an equalization matrix obtained by channel estimation, finding out the constellation point of each data-contained subcarrier closest to the resistance, calculating the Euclidean distance between the point and the ideal constellation point, and calculating the RMS mean value of all errors in a group of detection;
and calculating according to the RMS mean value to obtain an error vector magnitude, and adjusting according to the error vector magnitude.
4. The WIFI product calibration test method of claim 1, wherein: between steps D and E, a calibration value test is also included, which specifically includes:
testing the calibration value and judging whether the calibration value is in a specified test standard range;
carrying out spectrum template test on the standard value, and judging whether the standard value is in a specified test standard range;
and carrying out frequency deviation test on the standard value, and judging whether the standard value is in a specified test standard range.
5. The WIFI product calibration test method of claim 1, wherein: between step D and step E, an RX test is further included, specifically including:
connecting the output end of the test instrument to the input end of the transmitter;
the test instrument sends a radio frequency signal to the transmitter;
the transmitter calculates the packet error rate of the signal according to the radio frequency signal;
the test instrument adjusts the sending power according to the packet error rate until the packet error rate of the signal is below a set value, and the minimum sensitivity is obtained.
6. The WIFI product calibration test method of claim 5, wherein: the set value of the packet error rate of the signal is 10%.
7. The WIFI product calibration test method of claim 1, wherein: in the step C, the method specifically comprises:
C1. placing the bin file into a terminal, and connecting the terminal with a test instrument;
C2. connecting the DUT with a test instrument;
C3. and when the terminal acquires the DUT, controlling the test instrument to perform a test process.
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| CN113839723A (en) * | 2021-11-26 | 2021-12-24 | 深圳飞骧科技股份有限公司 | DEVM test platform and method for Wi-Fi6 chip |
| CN116016293A (en) * | 2023-03-22 | 2023-04-25 | 深圳市亿联无限科技股份有限公司 | Multi-task queue testing method, system and platform for network communication product production |
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