Design Of Multi-Modulation Baseband Modulator And Demodulator For Software Defined Radio
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Date
2011-12
Authors
Chye, Yin Hui
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
In contrast to hardware-based radio that only delivers single communication
service using particular standard, the software defined radio (SDR) provides a highly
reconfigurable platform to integrate various functions for multi-modulation, multiband
and multi-standard wireless communication systems. However, this project is
only based on multi-modulation SDR, such as 4-PAM, BPSK, QPSK and 16-QAM.
The configurable multi-modulation baseband modulator (MMBM) and demodulator
(MMBD) are designed using digital signal processing (DSP) algorithms based on
common features shared by single-modulation structures, and then implemented into
Xilinx Virtex-4 FPGA. Comparing the real-time and simulation results shows that
the timings are equivalent, and the sign and magnitude changes are significant.
Furthermore, at least 17% FPGA utilizations have been saved for the configurable
MMBM and MMBD as compared to the grouped-modulation baseband modulator and
demodulator respectively, which are modified from the previous works. Moreover, digitalto-
analog converter (DAC) and analog-to-digital converter (ADC) can be changed for
different applications by integrating setup configuration for DAC and ADC into the
configurable MMBM and MMBD respectively. Besides, the configurable MMBM
and MMBD can be further modified to include higher M-ary modulations of PSK,
PAM and QAM.
Description
Keywords
Design of multi-modulation baseband modulator , Demodulator for software defined radio