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SOFTWARE DEFINED RADIO SDR by Faezah Jasman

Objectives.. Introduction to Software Defined RadioWhy we need SDRKey ?Features to SDR technologyArchitecture of SDR SystemSDR can do moreAdvantages

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SOFTWARE DEFINED RADIO SDR by Faezah Jasman

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    1. SOFTWARE DEFINED RADIO (SDR) by Faezah Jasman

    2. Objectives. Introduction to Software Defined Radio Why we need SDR Key Features to SDR technology Architecture of SDR System SDR can do more Advantages & Disadvantages. Examples of prototype Vanu Software Radio Conclusion

    3. What is radio? Any device that intentionally transmits or receives signals in the radio frequency Examples: AM & FM Radios TV Cell phones ( Handsets) Pagers, satellite, radar Cellular base stations

    4. What is Software Defined Radio (SDR) The technology of building radios using software. Term software radio was coined in early 1990. One hardware can perform different functions Widely used in wireless communication military applications cellular base stations because of its ability to simplify hardware design. Not yet- handsets, pda

    5. Hardware Vs Software ASICs application specific IC Little flexibility only for specific purposes FPGA and DSP-Digital Signal Processors and Field Programmable Gate Array Function can change according to the program

    6. Why we need SDR? Interoperability problem. Caused by incompatible radio systems. Any differences in the frequency,bandwidth or standards prevent the users from communicating from each other. This problem is getting worse as mobile technology continues to change and yield new standards.

    7. Why we need SDR? Commercial wireless network standards are continuously evolving from 2G,3G & 4G. Users have to buy new handset whenever a new standards is deployed. The air interface and link-layer protocols differ across various geographies Japan=CDMA, Europe = GSM/TDMA etc Inhibit roaming

    8. Architecture of Radio system Basic conventional digital radio system RF section IF section Baseband section

    10. Architecture of SDR system Implemented using FPGA and DSP (Field Programmable Gate Array & Programmable DSP) Performs functions formerly carried out in hardware such as Converting voice & data to radio signal Radio-signal generation Frequency tuning Modulation/coding

    11. SDR hand sets Its function defined by software Handles different standards with single transmitter and receiver Any channel is selected from the baseband signal by digital filters implemented in the programmable DSP

    13. Software Defined Cellphone

    14. SDR can do more Can make all kinds of radios perform better by helping them adapt in real time to the rapidly changing characteristics of the wireless environment Eg: RF power control to make radio work better Additional code to mitigate interference in congested radio environment

    15. Key features of SDR technology Reconfigurability Allows different standards by selecting the appropriate software module to run Ubiquitous Connectivity- Enables implementation of air interface standards as software modules. Interoperability- Facilitates implementation of open architecture radio systems. Can use third party applications on their handsets.

    16. Advantages of SDR Software upgrade = migration of networks Multiple software modules that implement different standards can co-exists in the handsets. Can be reconfigured on the fly. Can be upgraded quickly & easily Can talk and listen to multiple channel

    17. Problems High power consumptions Higher processing power requirement Higher initial costs Not suitable for all kinds of radio equipment. eg:pagers

    18. Examples: Vanu Software Radio is the first commercially available solution where a single reusable hardware platform can support multiple wireless services and standards entirely in software Vanu, Inc. produce software that can run on a wide range of processing platforms, from a handheld device to a commercial-grade server, allowing customers to choose the best processor for their application

    19. Conclusion The technology can be used to implement wireless network infrastructure equipment wireless handsets, PDAs, wireless modems etc Factors that need to be considered higher power consumption, increased complexity of software and possibly higher initial cost of equipment A promising technology that facilitates development of multi-band, multi-service, multi-standard, multi-feature consumer handsets and future-proof network infrastructure equipment.

    20. THANK YOU

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