AbstracrSpread-spectrum communications, with its inherent illterference attenuation capability, has over the years become an increasingly popular technique for use in many different systeml:. Applications range from antijam systems, to code division multiple access systems, to systems designed to combat multipath.It is the intention of this paper to provide a tutorial treatment of the theory c% spread-spectrum communications, including a discussion on the applications referred to above, on the properties of commom spreading sequences, and on techniques that can he used for a(-quisition and tracking.

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