Methods of calibrating a device under test to communicate wirelessly
A method of calibrating a device under test (DUT) to communicate wirelessly includes providing predetermined reference signal strength values corresponding to a reference device, the reference signal strength values including a first group of signal strength values measured at each of a first plurality of transmission power levels. The method further includes measuring signal strength values for the DUT including a second group of signal strength values measured at each of a second plurality of transmission power levels, mapping the measured signal strength values in the second group of signal strength values to corresponding reference signal strength values in the first group of signal strength values to create a plurality of mapped data pairs, and generating a lookup table according to the mapped data pairs and storing the generated lookup table in a memory of the DUT. The method also includes calibrating the DUT according to the lookup table.
1. A method of calibrating a device under test (DUT) to communicate wirelessly, the method comprising:
providing predetermined reference signal strength values corresponding to a reference device, the reference signal strength values comprising a first group of signal strength values measured at each of a first plurality of transmission power levels;
measuring signal strength values for the DUT comprising a second group of signal strength values measured at each of a second plurality of transmission power levels;
mapping the measured signal strength values in the second group of signal strength values to corresponding reference signal strength values in the first group of signal strength values to create a plurality of mapped data pairs;
generating a lookup table according to the mapped data pairs and storing the generated lookup table in a memory of the DUT; and
calibrating the DUT by replacing the measured signal strength values in the second group of signal strength values with the corresponding reference signal strength values in the first group of signal strength values.
2. The method of claim 1 , further comprising:
determining whether two or more signal strength values in the second group of signal strength values are equal to one another and are mapped to different signal strength values in the first group of signal strength values; and
performing the following steps when it is determined that two or more signal strength values in the second group of signal strength values are equal to one another and are mapped to different signal strength values in the first group of signal strength values:
adjusting an interval between successive transmission power levels in the second plurality of transmission power levels at which the second group of signal strength values are measured;
re-measuring the signal strength values for the DUT to produce an adjusted second group of signal strength values measured at each of an adjusted second plurality of transmission power levels;
mapping the measured signal strength values in the adjusted second group of signal strength values to corresponding reference signal strength values in the first group of signal strength values to recreate the plurality of mapped data pairs;
repeating the adjusting, re-measuring, and mapping steps until it is determined that no signal strength values in the adjusted second group of signal strength values are equal to one another and are mapped to different signal strength values in the first group of signal strength values;
regenerating the lookup table according to the mapped data pairs and storing the generated lookup table in the memory of the DUT; and
recalibrating the DUT by replacing the measured signal strength values in the adjusted second group of signal strength values with the corresponding reference signal strength values in the first group of signal strength values.
3. The method of claim 1 , wherein the first group of signal strength values has a higher quantity of signal strength values than the quantity of signal strength values in the second group of signal strength values.
4. The method of claim 3 , wherein an interval between successive transmission power levels in the first plurality of transmission power levels is constant and an interval between successive transmission power levels in the second plurality of transmission power levels is constant.
5. The method of claim 1 , wherein generating the lookup table according to the mapped data pairs comprises creating a regression model according to the mapped data pairs, and generating the lookup table according to the regression model.
6. The method of claim 1 , wherein generating the lookup table according to the mapped data pairs comprises extrapolating or interpolating additional data pairs according to the mapped data pairs, and generating the lookup table according to the mapped data pairs and the additional data pairs.
7. The method of claim 1 , wherein the signal strength values measured for the DUT are received signal strength values, and the first plurality of transmission power levels and the second plurality of transmission power levels are power levels at which a transmitting device transmits signals to the DUT.
8. The method of claim 7 , wherein the received signal strength values measured for the DUT are received signal strength indicator (RSSI) values.
9. The method of claim 1 , wherein the DUT communicates wirelessly through a wireless local area network (WLAN) or a mobile phone network.
10. A method of calibrating a device under test (DUT) to communicate wirelessly, the method comprising:
measuring reference signal strength values corresponding to a reference device, the reference signal strength values comprising a first group of signal strength values measured at each of a first plurality of transmission power levels;
measuring signal strength values for the DUT comprising a second group of signal strength values measured at each of a second plurality of transmission power levels;
mapping the measured signal strength values in the second group of signal strength values to corresponding reference signal strength values in the first group of signal strength values to create a plurality of mapped data pairs; and
generating a lookup table according to the mapped data pairs and storing the generated lookup table in a memory of the DUT.
11. The method of claim 10 , further comprising:
calibrating the DUT by replacing the measured signal strength values in the second group of signal strength values with the corresponding reference signal strength values in the first group of signal strength values.
12. The method of claim 10 , further comprising:
determining whether two or more signal strength values in the second group of signal strength values are equal to one another and are mapped to different signal strength values in the first group of signal strength values; and
performing the following steps when it is determined that two or more signal strength values in the second group of signal strength values are equal to one another and are mapped to different signal strength values in the first group of signal strength values:
adjusting an interval between successive transmission power levels in the second plurality of transmission power levels at which the second group of signal strength values are measured;
re-measuring the signal strength values for the DUT to produce an adjusted second group of signal strength values measured at each of an adjusted second plurality of transmission power levels;
mapping the measured signal strength values in the adjusted second group of signal strength values to corresponding reference signal strength values in the first group of signal strength values to recreate the plurality of mapped data pairs;
repeating the adjusting, re-measuring, and mapping steps until it is determined that no signal strength values in the adjusted second group of signal strength values are equal to one another and are mapped to different signal strength values in the first group of signal strength values; and
regenerating the lookup table according to the mapped data pairs and storing the generated lookup table in the memory of the DUT.
13. The method of claim 10 , wherein the first group of signal strength values has a higher quantity of signal strength values than the quantity of signal strength values in the second group of signal strength values.
14. The method of claim 13 , wherein an interval between successive transmission power levels in the first plurality of transmission power levels is constant and an interval between successive transmission power levels in the second plurality of transmission power levels is constant.
15. The method of claim 10 , wherein generating the lookup table according to the mapped data pairs comprises creating a regression model according to the mapped data pairs, and generating the lookup table according to the regression model.
16. The method of claim 10 , wherein generating the lookup table according to the mapped data pairs comprises extrapolating or interpolating additional data pairs according to the mapped data pairs, and generating the lookup table according to the mapped data pairs and the additional data pairs.
17. The method of claim 10 , wherein the signal strength values measured for the DUT are received signal strength values, and the first plurality of transmission power levels and the second plurality of transmission power levels are power levels at which a transmitting device transmits signals to the DUT.
18. The method of claim 17 , wherein the received signal strength values measured for the DUT are received signal strength indicator (RSSI) values.
19. The method of claim 10 , wherein the DUT communicates wirelessly through a wireless local area network (WLAN) or a mobile phone network.