software defined radio
TRANSCRIPT
FPGA
IMPLEMENTATION
OF 4PSK
MODULATION AND
DEMODULATION
FOR SOFTWARE
DEFINED RADIO
WHAT IS SOFTWARE DEFINED RADIO ? HOW IS IT
DIFFERENT FROM TRADITIONAL HARDWARE
RADIO?
Software Defined Radio(SDR) is awireless communication device inwhich all of the signal processing isimplemented in software.
SDR defines a collection ofhardware and software technologieswhere some or all of the radio’soperating functions(also referred toas physical layer processing) areimplemented through modifiablesoftware or firmware operating onprogrammableprocessingtechnologies(FPGA,DSP,PSoC).
SUPERHETERODYNE RECEIVER (TRADITIONAL RADIO)
SOFTWARE DEFINED RADIO
ISSUES WITH TRADITIONAL RADIO
These Radio systems were designed to communicate using oneor two waveforms.
Two groups of people with different types of traditional radioswere not able to communicate.
Different set of H/W for different types of radio communications,which limit cross-functionality and can be only modified throughphysical intervention.
This results in higher production costs and minimal flexibility insupporting multiple waveform standards.
By contrast, Software Defined Radio(SDR) technology providesan efficient and comparatively in expensive solution to thisproblem , allowing multimode, multi-band and/or multi-functionalwireless devices that can be enhanced using software upgrades.
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
APPROACH
PSK is considered an efficient form of datamodulation because it provides the lowestprobability of error for a given received signal ,when measured over one symbol period.
Hence PSK finds widespread use in both militaryand commercial communication systems.
The modulation scheme used for this project isQuadrature Phase-Shift Keying(4PSK)
The 4PSK waveform will be developed using Xilinxsystem generator & Matlab , Simulink tools andimplemented on the Virtex-6 Field ProgrammableGate Array(FPGA) of SDR platform.
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.
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.