| Telecommunication has still held the important status in modern communication, and has been applied in the fields of commercial, weather, military and so on. Telecommunication system has been transformed from analogy system to digital system. In this period software radio has been raised. Its clou is: building hardware flat which is opening, standard and modularization, implementing all the functions with software. This paper is a research project of Transceivers in an 15-95 base-station. Its main content is about how to treat with the signal sampling in IF (70MHz) band with digital method completely for 15-95 system. This context expatiates upon Spread-Frequency communication, 15-95 standard, software radio and digital signal process, then describe a IS-95 IF subsystem based on PDC and CPLD. Besides it shows off the circuit diagrams and system evaluations.
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