This document discusses the implementation of 4PSK modulation and demodulation for software defined radio using an FPGA. It begins by explaining what software defined radio is and how it differs from traditional hardware radios by implementing signal processing in software. The document then discusses the issues with traditional radios and how SDR provides a more flexible solution. It aims to develop and deploy a 4PSK waveform on an FPGA for an SDR platform and evaluate performance using BER, eye diagrams and constellation diagrams. The future scope of using SDR for both defense and commercial applications is also mentioned.

1. FPGA
IMPLEMENTATION
OF 4PSK
MODULATION AND
DEMODULATION
FOR SOFTWARE
DEFINED RADIO

2. WHAT IS SOFTWARE DEFINED RADIO ? HOW IS IT
DIFFERENT FROM TRADITIONAL HARDWARE
RADIO?
 Software Defined Radio(SDR) is a
wireless communication device in
which all of the signal processing is
implemented in software.
 SDR defines a collection of
hardware and software technologies
where some or all of the radio’s
operating functions(also referred to
as physical layer processing) are
implemented through modifiable
software or firmware operating on
programmableprocessing
technologies(FPGA,DSP,PSoC).

3. SUPERHETERODYNE RECEIVER (TRADITIONAL RADIO)
SOFTWARE DEFINED RADIO

4. ISSUES WITH TRADITIONAL RADIO
 These Radio systems were designed to communicate using one
or two waveforms.
 Two groups of people with different types of traditional radios
were not able to communicate.
 Different set of H/W for different types of radio communications,
which limit cross-functionality and can be only modified through
physical intervention.
 This results in higher production costs and minimal flexibility in
supporting multiple waveform standards.
 By contrast, Software Defined Radio(SDR) technology provides
an efficient and comparatively in expensive solution to this
problem , allowing multimode, multi-band and/or multi-functional
wireless devices that can be enhanced using software upgrades.

5. AIM OF THE PROJECT
Modulation
(Mapper+D
UC+Mixer)
DATA
IF(Digital)
Digital to
Analog
convertor
(DAC)
IF
(Analog)
RF
MODULE
RF
MODULE
Analog to
Digital
convertor
(ADC)
IF
(Analog) IF(Digital)
Demodulati
on
(Mixer+DD
C+Demapp
er)
DATA

6. APPROACH
 PSK is considered an efficient form of data
modulation because it provides the lowest
probability of error for a given received signal ,
when measured over one symbol period.
 Hence PSK finds widespread use in both military
and commercial communication systems.
 The modulation scheme used for this project is
Quadrature Phase-Shift Keying(4PSK)
 The 4PSK waveform will be developed using Xilinx
system generator & Matlab , Simulink tools and
implemented on the Virtex-6 Field Programmable
Gate Array(FPGA) of SDR platform.

7.  The objective of the project is to develop and
deploy the waveform on Virtex-6 FPGA of SDR
platform
 The performance of the waveform is estimated by
Bit Error Rate(BER),Eye diagram and Constellation
diagram.

8. FUTURE SCOPE
 Presently SDR is being developed for Defence purpose.
 The main reason why SDR came into picture is that they want to
develop a radio such that they can communicate with each other
irrespective of Frequency band limitations
 This can be achieved by SDR which eliminates different kind of Radio
hardware for different RF bands.
 For commercial purpose SDR has wide range of applications which we
can see in near future.