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Objectives.. Introduction to Software Defined RadioWhy we need SDRKey ?Features to SDR technologyArchitecture of SDR SystemSDR can do moreAdvantages
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1. SOFTWARE DEFINED RADIO (SDR)byFaezah 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