Signals and Frequencies
So far we have considered some aspects of the transmission of sine waves and their admixture with noise. In actual communication systems, we transmit complicated signals. Before we proceed to consider the transmission of such signals, we need to know a little about the representation of complicated waveforms, and even of two-dimensional patterns, by sums of sine waves. Why sines and cosines? Because these functions are the stable or bounded solutions of the differential equations of linear circuit theory and electromagnetic wave propagation.
KeywordsFourier Transform Transfer Function Fourier Series Delta Function Time Function
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