The basics for learning the Communication Systems is as follows :-
These are sequence of steps to study the subjects sequentially
Signals and Systems
Analog Communication- AM, FM, PM
Random Variables and Stochastic Processes
Noise Theory and how it affects the Analog Modulation
Digital Communication- PCM, DPCM, DM, ADM, and how noise affects them
Digital Modulation Schemes- ASK, PSK, FSK, MSK, GMSK, QPSK, QAM, DPSK, DEPSK
Study of Digital Receivers
Electromagnetic Theory
Antennas
Digital Signal Processing
Information Theory
These are the basics. After having an idea about these topics. You can move onto topics such as Advanced Wireless Communication which uses these topics extensively.
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