Abstract
The foundamental idea of software Defined Radio(SDR) is to establish a open,standard
and modular universal hardware platform where the A/D converter is moved as closed as
possible to antenna and all of the communication function is realized by software.The aim is to
research and develop a high flexible and adaptable communication system.The technology of
making A/D converter has been advanced fast.The A/D working bandwidth has covered the
intermediate frequency (IF) supporting high sampling frequency and wide dynamic range and
long length .The wireless transmitter technology has been developing from digital baseband to
digital IF .Thusit is possible to implement the wide bandwidth digital IF transmitter based on
bandpass sampling theory.
Digital Frequency Conversion Technology in Software Defined Radio and various types of
digital launch or receiver have been widely used .As the digital signal processor (DSP)
processing speed is limited ,often it is difficult for A/D sampling rate to be high-speed digital
signal directly to the various categories of real-time processing .In order to resolve this
contradiction,the need for digital up or down conversion technology,high-speed sampling rate
of signals to be turned into a low rate of base-band signal for the next stage of signal
processing.With fiel-programmable array(FPGA) to the design of digital down-converter has
many advantages.FPGA hardware has strong stability and high computational speed,the
software has programmable features,and in some special DDC chip technology can not
completely meet the indicators ,so the number of used FPGA to design the next converter is a
good solution.
This dissertation intrduced the concept and the structure of Software Defined Radio,as well
as an specific application of FPGA for Software Radio.Including frequency conversion
technology in intermediate frequency processing,Digital Up Converter Base on the basic
principle of the use of the various advantages of FPGA devices. development tool in the FPGA
on the Quartus Ⅱ .DUC completed the design,integration.after the compiling implementation
simulation.First introduced the principle of digital up conwersion and of each module,and then
VHDL language by writing and calling IP nuclear to achieve each module function,and
finally,through the schematic diagram of the structure to the overall realize frequency in the
figures.And through the simulation to verify the up-conversion.
Key Words: DUC;FPGA; CIC filter;Interpolation
