Godkända
Wireless Sensor Network Optimizations Using Software Defined Radio Techniques
Zhonghua Wang () och Ziyang Li ()
Start
2011-04-11
Presentation
2012-09-14 13:15
Plats:
E:2311
Avslutat:
2012-12-21
Examensrapport:
(Kontakta handledare)
Sammanfattning
Software Defined Radio (SDR) is a revolutionary method for radio implementations that typically based on hardware electronic circuits. The new method implements radio by means of software instead of discrete electronics. The most advantage of SDR is flexibility which allows rapidly reconfiguring the digital signal processing in software and collocating with multi-standard physical layers (PHY). So SDR is a good approach for both fast prototype and practical products development. GNU Radio is an open source software development toolkit that provides signal processing modules to implement SDR. Porting GNU Radio into embedded system platforms is meaningful since development based on embedded system platforms will be more and more prevalent in the future. Wireless Sensor Networks (WSNs), which are the basis of Internet of Things (IoTs), are presently mainly implemented on specific designed radio circuits. These circuits usually only have single function and fix hardware configuration which are more and more noadaptive to comprehensive application requirements of nowadays. To find out a way to implement WSNs on wide range platforms, the flexibility of SDR can be brought in. In this thesis we integrate WSN into the USRP E100 platforms, which combine universal software radio perpheral (USRP) and general purpose processor (GPP) together, by using SDR to verify the mentioned attractive scenario. GNU Radio is adopted to implement the radio signal processing. The Contiki Operating System that provides rich protocol stacks for implementing WSN is used to program applications for WSN. GNU Radio and Contiki applications being as independent processes are integrated with inter-process communication (IPC). Thus the entire WSN including L1 (PHY), L2 (Data Link), and L3 (Network), can be implemented on the embedded system platforms by means of SDR. We evaluated the functionality and performance of the whole system on USRP E100 platforms. WSN can implement on the new platforms in SDR way but the performance is not good when data rate of PHY stipulated by IEEE802.15.4 standard is implemented. High data rate causes high data loss rate because of the computing power limitation of the processor.
Handledare: Zhitao He (Swedish Institute of Computer Science)
Examinator: Ove Edfors (EIT)