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.