analog and other stuff
http://en.wikipedia.org/wiki/Modulation
Digital Modulation Techniques
By Fuqin Xiong
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Fundamentals of Spread Spectrum Modulation
By Rodger E. Ziemer
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Bandwidth-Efficient Digital Modulation with Application to Deep-Space Communications
By Marvin K. Simon
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Detection, Estimation, and Modulation Theory
By Harry L. Van Trees
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Digital Modulation and Coding
By Stephen G. Wilson
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