Download - 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]