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Once many principles are elevated to theory, they are often accompanied by complicated mathematical derivation, and the very simple essence is overwhelmed by a large number of formulas. Communication principles therefore discourage many people.
But there may well be a very simple truth behind a very complex formula.
The key to truly learning communication principles is to see the essence through the formulas. Take the complex Fourier coefficients as an example:
Many people just know how to calculate using formulas, and not many people truly understand its meaning. Even fewer people really understand the "negative frequencies" that often appear.
傅里叶级数展开式:
f ( t ) = ∑ k = −