Methods and systems of power detection
View Patent ↗Exemplary embodiments are disclosed of methods and systems of power detection in RF circuits to provide gain compensation for vehicle systems. In exemplary embodiments, a module (e.g., a front end module (FEM), compensor, compensator, etc.) includes a gain modifier, a power detector, and a controller. The power detector is configured to detect a power output of the gain modifier. The controller is configured to determine a mean of n samples taken by the power detector. The controller is also configured to determine a boundary to mean ratio of the n samples. The controller is further configured to adjust a detected value of the power detector based on the mean and the boundary to mean ratio.
1. A module comprising:
a gain modifier;
a power detector configured to detect a power output of the gain modifier; and a controller configured to:
determine, from n samples from the power detector, a mean of the n samples taken by the power detector;
determine, from the n samples from the power detector, a maximum peak of the n samples taken by the power detector;
determine, from the n samples from the power detector, a minimum peak of the n samples taken by the power detector;
determine, based on at least one characteristic of a modulated signal, a boundary to mean ratio of the n samples, wherein the boundary is determined using the maximum peak or the minimum peak, and the at least one characteristic of the modulated signal;
adjust a detected value of the power detector based on the mean and the boundary to mean ratio; and
control gain of the gain modifier based on the adjusted detected value.
2. The module of claim 1 , wherein the mean is one of an arithmetic mean or a square root mean.
3. The module of claim 1 , wherein:
the boundary to mean ratio (xPAR) is a maximum peak-to-average ratio (maxPAR); and
the controller is configured to determine the maximum peak-to-average ratio by subtracting the mean from the maximum peak of the n samples taken by the power detector.
4. The module of claim 1 , wherein:
the boundary to mean ratio (xPAR) is a minimum peak-to-average ratio (minPAR); and
the controller is configured to determine the minimum peak-to-average ratio by subtracting the minimum peak of the n samples taken by the power detector from the mean.
5. The module of claim 4 , wherein the controller is configured to determine compensation (P<letRMs) for the power detector.
6. The module of claim 5 , wherein the controller is configured to adjust the detected value of the power detector by compensation (PdetRMs).
7. The module of claim 6 , wherein the adjustment to the detected value of the power detector by the compensation (PdetRMs) improves RMS output power level accuracy of the power detector.
8. The module of claim 1 , wherein:
the boundary is the maximum peak of then samples taken by the power detector; and
the controller is configured to determine the boundary to mean ratio (xPAR) by subtracting the mean from the maximum peak.
9. The module of claim 1 , wherein:
the boundary is the minimum peak of the n samples taken by the power detector; and
the controller is configured to determine the boundary to mean ratio (xPAR) by subtracting the minimum peak from the mean.
10. The module of claim 1 , wherein the boundary to mean ratio (xPAR) is selected from one of a maximum peak-to-average ratio (maxPAR) or minimum peak-to-average ratio (minPAR) and the controller is configured to determine compensation (P<letRMs) for the power detector by equation:
P detRMs=MEAN+ X (xPAR,MEAN)
X refers to a value from a Compensation Look-Up Table that corresponds with the boundary to mean ratio (xPAR) and the mean (MEAN).
11. The module of claim 1 , wherein the boundary to mean ratio (xPAR) is selected from one of a maximum peak-to-average ratio (maxPAR) or minimum peak-to-average ratio (minPAR) and the controller is configured to determine compensation (P<letRMs) for the power detector by equation:
P detRMs=MEAN+ X (xPAR,MEAN)
where X refers to a value determined by a function that correlates the boundary to mean ratio (xPAR) and the mean (MEAN).
12. The module of claim 1 , wherein the boundary to mean ratio (xPAR) is selected from one of a maximum peak-to-average ratio (maxPAR) or minimum peak-to-average ratio (minPAR) and the controller is configured to determine compensation (PdetRMS) for the power detector by equation:
P detRMS=(Σ k n =1 V k )/ n −(xPAR, MEN )
where V k refers to a sampled power detector signal of the n samples taken by the power detector; and
where A refers to a value determined by a function that correlates the boundary to mean ratio (xPAR) and the mean (MEAN) or from a Compensation Look-Up Table that corresponds with the boundary to mean ratio (xPAR) and the mean (MEAN).
13. The module of claim 1 , wherein the boundary to mean ratio (xPAR) is selected from one of a maximum peak-to-average ratio (maxPAR) or minimum peak-to-average ratio (minPAR) and the controller is configured to determine compensation (PdetRMS) for the power detector by equation:
P detRMS=√{square root over ((Σ k n =1 V k )/ n−A (xPAR, MEN ))}
where V k refers to a sampled power detector signal of the n samples taken by the power detector; and
where B refers to a value determined by a function that correlates the boundary to mean ratio (xPAR) and the mean (MEAN) or from a Compensation Look-Up Table that corresponds with the boundary to mean ratio (xPAR) and the mean (MEAN).
14. The module of claim 1 , wherein the module is configured to support both DSRC/802.11p standard and c-V2X LTE standard for V2X.
15. The module of claim 1 , wherein the module is configured for use with at least one modulated signal having a nonconstant signal envelope.
16. The module of claim 1 , wherein the module is configured for use with at least one modulated signal having a nonconstant signal envelope including one or more of Dedicated Short-Range Communication (DSRC) signals, C-V2X signals, 5G new radio signals, and/or WLAN signals.
17. The module of claim 1 , wherein the at least one characteristic of the modulated signal includes output power of the modulated signal.
18. A method comprising:
determining, from n power detector signal samples from a power detector, a mean of the n power detector signal samples taken by the power detector;
determining, from the n power detector signal samples from the power detector, a maximum peak of the n power detector signal samples taken by the power detector;
determining, from the n power detector signal samples from the power detector, a
minimum peak of the n power detector signal samples taken by the power detector;
determining, based on at least one characteristic of a modulated signal, a boundary to mean ratio of the n power detector signal samples, wherein the boundary is determined using the maximum peak or the minimum peak, and the at least one characteristic of the modulated signal;
adjusting a detected value of the power detector based on the mean and the boundary to mean ratio; and
controlling gain of a gain modifier to the power detector, based on the adjusted detected value.
19. The method of claim 18 , wherein the mean is one of an arithmetic mean or a square root mean.
20. The method of claim 18 , wherein:
determining the boundary to mean ratio (xPAR) of the n power detector signal
samples includes subtracting the mean from the maximum peak.
21. The method of claim 18 , wherein:
determining the boundary to mean ratio (xPAR) of the n power detector signal samples includes subtracting the minimum peak from the mean.
22. The method of claim 18 , wherein the method includes determining compensation (PdetRMS) for the power detector.
23. The method of claim 22 , wherein adjusting the detected value of the power detector based on the mean and the boundary to mean ratio comprises adjusting the detected value of the power detector by the compensation (PdetRMs).
24. The method of claim 22 , wherein adjusting the detected value of the power detector by the compensation (P<letRMs) improves RMS output power level accuracy of the power detector.
25. The method of claim 18 , wherein the power detector comprises a diode detector configured to detect a power output of a gain modifier of a V2X front end module (FEM).