Design of digital up and down converter of reconfigurable WCDMA system based on digital IF

Abstract

The fundamental ideas of Software Defined Radio are the flexibility in design for various communication needs by utilizing digital signal processing technology. Software Defined Radio is emerging as potential pragmatic solution for the current and next generation wireless multimedia communication systems. In this thesis, the design of digital up and down converter for reconfigurable WCDMA system is presented, using Digital IF technology which is one of the basic components. In actual implementation, main consideration is given to efficiently that can lead to obtain the lower power consumption, and the smaller space requirement within FPGA chips. Numerically controlled frequency oscillator and multi-stage filters are designed to show the efficiency and especially for filter design. The novel technique, based on the use of canonic signal digit (CSD) code, is applied to implement the anti-alias filter structures. Simulation results are parts of the actual implementation with VHDL is shown to reflect the effects of theses research.