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SOFTWARE DEFINED RADIO Technology Overview. ELITEX 2008 New Delhi 18 th Jan 08. Simon Zachariah Centre for Development of Advanced Computing TRIVANDRUM.

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slide1

SOFTWARE DEFINED RADIO

Technology Overview

ELITEX 2008

New Delhi 18th Jan 08

Simon Zachariah

Centre for Development of Advanced Computing

TRIVANDRUM

slide2
Radio that provides software control of a variety of modulation techniques, wideband or narrowband operation, communication security functions and waveform requirements of current and evolving standards over a broad frequency range.

‘The radio waveform personality can be reconfigured through software’

‘Multi-band,Multi-standard,Multi-service,Multi-channel’

SDR - DEFINITION

slide3

SDR EXPLAINED

Software Defined Radio

Hardware Radio

slide4

DUAL MODE RADIO

Software

GSM

Chipset

CDMA

chipset

Hardware

Micro controller

slide5

RE-CONFIGURABLE RADIO

Processing Engine

FPGA

DSP

Software

FPGA

RF to Digital

Hardware

Micro controller

slide6

SDR KEY BENEFITS

  • A single Hardware for Multi-standard, multiband and multifunctional Wireless Systems
  • Software Upgrade for add on functionalities
  • Customization of a single generic hardware for diverse needs
  • Higher levels of software reusability
  • Lower costs to meet new user demands
  • Lower time to market new terminals
slide7
Complete Base band processing digital – Reconfigurable

Software upgrading of commercial radios – Future proof

Generic hardware can be used for a variety of applications – Inventory

Software prototyping faster and cheaper than hardware

prototyping – Time to market

Libraries of software radio components are easily created and shared – Reuse

Digital processing of signals is ideal, unencumbered by the non-linearities that plague analog hardware-Reliability

SDR ADVANTAGES

slide8
ADC : the single most demanding performance

DAC : similar to ADC requirements

DDC / DUC : (Digital down/up converters) programmable embedded DSP functionalities with NCO for RSP/TSP with frequency hopping capability

FPGAs: Embedded DSP functionalities

DSP : meet computational requirements of base band processing

Host Processor : OE, Protocol stacks, MMI, system controls

Operating System S/W and F/W

Broadband RF Front End

Smart Antennas

Multi-Carrier Power Amplifier (MCPA) in Base Stations

SDR ENABLING TECHNOLOGIES

Why SDR took so long to happen?

These enabling technologies had to mature

slide9
Civil wireless

Military

PMR

SDR USER SEGMENTS

Diverse Waveforms and Form Factors, Emerging standards,

User wish-lists often from LF to microwave! And AM, FM …. GSM …. CDMA … Bluetooth … and (sigh!) ends up today with WiMax.

Success lies in judicious user-segmentation and application

Power consumption is still a problem

slide10
The US DoD -Speak Easy Projects

JTRS Waveforms and Form Factors

The Software Communication Architecture

H/W interoperability – S/W portability – Custom waveforms

SDR MILITARY DRIVE

slide11
All processes between the signal source and antenna

Also referred to as Air Interface

FM, Havequick, Link16, TETRA….. All have specific waveforms

WAVEFORM DEFINITION

slide12
IEEE “Aradio that is aware of its environment and internal state and alter its behaviour based on the information and predefined objective”

CR is designed to intelligently detect whether a particular segment of the radio spectrum is currently in use, and to jump into (and out of, as necessary) the temporarily-unused spectrum very rapidly, without interfering with the transmissions of other authorized users.

CR can run on a hardware radio or SDR

COGNITIVE RADIO

slide13
Digital Signal Processing replaces several analog hardware stages of traditional radios

Analog front-end still required:

Digital-analog conversion, DAC/ADC

RF, IF Filtering

Mixing IF  RF

Amplification

Antennas

SDR HARDWARE……..

slide14
If the Radio Space has only a few signals in LF/HF

No ADC exists with the bandwidth and resolution required (sampling speed & no: of bits) to cope with the dynamic range

With today’s technology, how close to the antenna the ADC/DAC can be placed?

SOFTWARE RADIO

slide15

OE, PROTOCOLS, MMI

GPP

Wideband

DAC

RF Power

amplifier

RF

upconverter

I

Q

Digital

UpConverter

IF

Information

input

DSP / FPGA

Antenna switching system

Wideband

ADC

RF

low-noise

amplifier

Digital

DownConverter

RF

downconverter

I

Q

IF

Information

output

SDR-HARDWARE ARCHITECHTURE

Multiband Antenna

slide16
Capable of ensuring the important SDR features

An open architecture

Allows third party waveform/component development

Standardised procedure for Loading and Control of software modules

Should be one relying on proven technologies – shorter development time

SCA from JTRS meets these criteria, natural choice

SDR-SOFTWARE ARCHITECHTURE

slide17
The Software Communications Architecture (SCA) is a US DoD (Department of Defense)defined framework standard that specifies rules on how to develop, deploy, and configure Software Defined Radio (SDR).

The main goal of the SCA is to reduce cost and increase interoperability in SDRs.

SCA is being adopted worldwide as a standard for military radios. It is expected that future global programmable radios in other fields, such as public safety, will adopt the SCA.

SOFTWARE COMMUNICATION ARCHITECTURE-SCA

slide18
SCA specifies an architecture for

component portability,

inter-changeability, and

software reuse, and

architecture scalability

of communication platforms

WHAT SCA CAN DO!

slide20

SCA-RADIO COMPOSITION

Application Factory

Manage collection of resources to create waveform

Device manager

Keep track of HW in the system

File System Manager

Store working environment, bit images, properties, etc.

Application

Manage waveform operation

Resources

Devices

Capabilities e.g.,

Start and stop, test, describe

Boot up and maintain HW

Domain Manager

Port

Keep track of what’s there (installed)

Connections between resources

slide21
Build SDR development capability in the country

Develop a proto type to demonstrate basic features of SDR

Emphasis is to demonstrate SDR features with limitedFeatures of the selected waveforms

Separate projects under taken for digital radio development

Standards Compliance is not intended

Bring synergy among various Govt. agencies in the country who are involved in SDR activities

Joint development with SAMEER

Close interaction with WESEE, DEAL & CAIR

Close interaction with user community (Army & Navy)

DIT - SDR PROJECT WITH CDAC

slide22

NEED FOR INDIGENOUS SDR TECHNOLOGY DEVELOPMENT

  • High IPR content
  • Need for indigenous base on strategic reasons
  • The technology of tomorrow’s Wireless
  • Military and Commercial interest
  • Success of 3G and beyond depends heavily on SDR
slide23

CDAC IN RETROSPECT

CDAC IS AN SDR FORUM MEMBER

CDAC TETRA PRODUCTS

Portable BS-4U

1U=44.43mm

slide24
SDR Study Report 2004

Study Report Review 2005

DIT Initiatives on SDR Mission Project 2005

Joint Proposal by CDAC & SAMEER 2006

Proposal review and approval by WG Jan 2007

Administrative approval received April 2007

CDAC SDR PROJECT - GENESIS

slide25
COTS Development Platform

Own H/W Platform

Two Reconfigurable Waveforms

One PMR – TETRA

One Military Legacy Radio – Stars V

SCA Compliant

More Waveforms to follow

CDAC SDR PROJECT SCOPE

slide26

SDR ‘DREAM’

“Dream is not what you see in sleep.It

is the thing which does not let you sleep.”

Dr. A P J Kalam

Today CDAC have an ‘SDR Dream’ and plans to fulfill it through a well defined SDR technology development roadmap

slide27

Questions?

CDAC-simon@cdactvm.in

DIT- bmbaveja@mit.gov.in

slide28

SDR-IMPORTANT REFERENCES

1. Software Defined Radio:Origins,Drivers and International Perspectives

By Tuttlebee

2. Software Defined Radio:Enabling Technologies By Tuttlebee

3. Software Defined Radio- Selected Readings By Mitola and Zvonar

4. Software Defined Radio for 3G By Paul Burns

4. SDR study Report By C-DAC (www.mit.gov.in)

5. SDR Forum web site www.sdrforum.org

PRESENATION REFENCE: INFORMATION FROM SDR FORUM