How to set up a function using an input-output table, but different input values

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Luki 2017-1-11

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https://ww2.mathworks.cn/matlabcentral/answers/320009-how-to-set-up-a-function-using-an-input-output-table-but-different-input-values

评论： Jordan Ross 2017-1-23

Consider a table with two columns: The left column gives input power and the right column the corresponding output power. There are 40 rows. The smallest value of the input power is -25 dBm. I want to set up two functions:

x = P1 * sin(2*pi*fc*t) + P2 * sin(2*pi*fc*t)
y = P1_out * sin(2*pi*fc*t) + P2_out * sin(2*pi*fc*t)

, where P1 = input power and P2 = input power, but P2 is always 3dBm smaller than P1. So for example: P1 = -22dBm, then P2 = -25dBm.

The problem is: The smallest value of Pin = -25dBm. That means P1 cannot become smaller than -22dBm, because otherwise P2 would be smaller than -25dBm. And there is no corresponding output value for P2 smaller than -25dBm.

I hope it is clear what my problem is. Every help is welcome!