APPARATUS AND METHOD FOR UP-CONVERTING DIGITAL FREQUENCY IN WIRELESS TELECOMMUNICATION SYSTEM

摘要

The present invention relates to an apparatus and method for digital frequency up-conversion, the apparatus comprising: a channel filter unit for first interpolating and channel filtering an IQ signal input from a channel card; A half band filter unit configured to output a baseband IQ signal by performing second band interpolation on the channel filtered signal and half band filtering; A modulator for modulating the baseband IQ signal into a first intermediate frequency signal; And a D / A conversion for converting the baseband IQ signal into an analog signal or up-modulating the first intermediate frequency signal into a second intermediate frequency having a frequency higher than the first intermediate frequency to convert the second intermediate frequency signal into an analog signal. It is characterized by including a wealth. ; According to the present invention, there is no need to use a channel filter in the channel card, and there is no need to use an IF SAW filter in the RF stage, and the configuration and design of the frequency up-conversion device is simple and debugging is easy. . In addition, the number of D / A converters and SAW filters can be reduced, which reduces mass production and system cost. The board size can be reduced, enabling compact system and easy frequency change.