Resumen
Data transmission using orthogonal functions means combining base carrier signals (scaled by numbers of useful information) into one sent signal. Processing the mixed signal after receiving allows dividing it back into carriers and restoring useful numbers.What is the most compact set of complex sine waves for this? How will the random components of the spectrum between the system signals (or the imperfection of the parameters) affect the result? What is the algorithm for processing the received signal and what is the minimum time needed to obtain the initial information? These issues are discussed ?from the bottom to up?, from simple physical considerations to mathematical expressions and processing algorithms in the MatLab package.