Software Defined Radio

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Software Defined Radio

Chandrakant Sharpa

SRMRI, Bangalore


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Outline

Current Scenario

Software Defined Radio

SDR @ SRMRI

Our Proposals


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Wireless Infrastrature and Ad-hocCommunication Networks Global mobile standards : 2G(GSM), 3G(WCDMA), 4G-LTE(OFDM)

Wireless standards : WiMax, Wi-Fi, Bluetooth, IEEE802.11a,b,g,n,p

Digital Terrestrial TV Broadcasting System: DAB, DVB, DMB

Intelligent Transport System : ETC, DSRC, CAR LAN

Home Network : ADSL, FTTH, Wireless USB

Wireless PAN : WPAN over UWB, IEEE802.15.3a, 3c

Sensor Network : RFIDTag, Zigbee, IEEE802.15.4a

Multistandard mobiles system eg. Software GPS, FM-Radio Machine to Machine communication

Dependable Healthcare communication

And many more.


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Current Hardware Defined Radio

Complicated dedicated hardware- expensive to develop

Very limited flexibility- static construction

Total reconstruction necessary in order to add or changefunctionality- new hardware chip

High analog complexity & high sensitivity of RFinterference

Analog power, size and weight scales with number ofchannels - expensive


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Traditional Hardware Defined Radio(HDR)


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Need

Goal: design aflexibleand openarchitecturesuitable for a variety of different wireless accesstechnologies.

Solution: Software Defined Radio [SDR]


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Reconfigurable Radio System

Courtesy : NICT


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SDRHistory

Software Radio' was coined in 1984 by a team atthe Garland Texas Division of E-Systems Inc.(now Raytheon),

"Software Defined Radio" was coined in 1991 byJoseph Mitola

First public software radio initiatives was aU.S. military project named SpeakEasy


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Software Radio in Tiers

Tier 0 : Hardware RadioNo software changes

Tier 1 : Software Controlled RadioRequire multiple hardware transceiversSoftware controls to choose transceiver

Tier 2 : Software Defined Radioemploys software to control various modulation

techniques

Tier 3 : Ideal Software RadioProgrammability extended to RF section


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What is Software Defined Radio(SDR)?

SDR transforms radio hardware problems to softwareproblems

Goal is to have software and algorithms as close toantenna as possible

The software, instead of hardware, defines thetransmitted waveforms and demodulates the receivedwaveforms.

Basically,


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New broadband SDR Generic hardware commerical-of-the-self (COTS)

Unlimited flexibility and completely programmable

Highly reusable software code for new and reconfiguredradio systems

Low analog complexity & less sensitive for RFinterference

Analog power, size and weight is constant andindependent of number of channels


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Broadband Software Defined Radio


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SDR Characteristics

Flexibility

Reconfigurable and Adaptable : reconfigurable and/orspecially designed radio solutions which is impractical withtraditional HDR technology

Recyclable : Algorithms can easily be recycled and integrated indifferent configurations for new radio-applications which speed upnew implementation

Bridge between theory and practice : New algorithms and systems can much more easily be tested and

evaluated in real radio systems rather than with simulations only.

Very usable as an experiment platform

Reconfigurable radio with SDR is therefore graduallyreplacing traditional HDR in many wireless system(like

LTE)


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New technologies exploiting flexibilityin SDR Reconfigurable Radio Systems(RRS) and Flexible Radio

Cognitive Radio(CR) & Dynamic Spectrum Access(DSA)

Decentralized, dynamic and dependable radio systems Non Standardized ad-hoc systems

Over-the-air(OTA) RadioShare radio functionality(software) through the air

Software Communication Architecture(SCA) SDRopen architecture framework for h/w & s/w

Joint Tactical Radio System(JTRS) next generationspeech-and-data radio for military purpose


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SDRPros and Cons

Pros various modulation methods using a common set of hardware

Elimination of analog hardware and its cost Ability to alter functionality just by software

possibility of adaptively choosing best suited operating frequency

Cons

difficulty of writing software for various target systems Security

Initial cost

Power consumption


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SDRChallenges

To achieve same efficiency as of purely hardwaresolution

Dynamically handle the broad range of spectrum

Providing best efficient technology of radiowithout involvement of user

Make network protocols adaptive to availablespectrum

Security


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Our Research Focus


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Proposals

Systematic study of Adaptability

SDR based system for heterogeneous networks

Remote Physical layer configuration

Plug-n-Play architecture for GNU Radio


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Expectation from Collaboration

Guidance with respect to choosing projects,direction of work

Suggestions from pure wirelesscommunication perspective

Output in terms of publications/patents


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Email-id : [email protected]

Software Defined Radio

Documents

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