Applications of orthogonal and orthonormal functions in engineering

[buffon2009]

I want to to know what's the usage of this theory in our life or is there any important application depend on that theory

I study it in physics of engineering but i want to to know what's the useful for it?

 

[MATLABdude]

Welcome to PhysicsForums!

If you've ever used a cell phone, wi-fi, or have cable TV, you've been the ditrect beneficiary of orthogonality / orthonormality. While the treatment you receive in linear algebra or even higher physics courses may seem a little abstract, the concept--independence across basis vectors / dimensions--is applied quite extensively in many fields.