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An experimental study of OFDM in software defined radio systems using GNU platform and USRP2 devices

Conference Paper


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Abstract


  • Orthogonal Frequency Division Multiplexing

    (OFDM) has been well examined in the literature via theoretical

    simulations. However, implementation of OFDM in actual

    hardware using Software Defined Radio (SDR) concepts

    and verification of its performance with different channel

    estimation methods in various propagation environments have

    been almost unexplored. The great flexibility feature of SDR

    systems facilitates the implementation and experimentation

    of OFDM systems with less cost and effort, compared to

    the implementation of the whole system in hardware. In this

    paper, a customized SDR testbed has been developed based

    on the GNU radio software platform and version-2 Universal

    Software Radio Peripheral (USRP2) devices to evaluate the

    practical error performance of OFDM-based systems in both

    Gaussian and Rician propagation environments. Three different

    channel interpolation techniques, namely linear interpolation,

    second-ordered interpolation and cubic spline interpolation, and

    a blind SNR estimation algorithm have been implemented in

    our testbed. The performances show that, as opposed to our

    intuition, linear channel interpolation in some cases might not

    only be simpler, but also more accurate than the two other

    non-linear interpolation techniques, implying that channels

    might change linearly between neighboring subcarriers. The

    experimental OFDM system on the developed SDR testbed

    performs very close to the simulated OFDM system, thus

    the developed testbed can be used to verify advanced signal

    processing techniques in OFDM systems in various realistic

    channels by simply developing software, without the need for

    otherwise complicated hardware developments.

Publication Date


  • 2014

Citation


  • L. Chung. Tran, D. Toan. Nguyen, F. Safaei & P. James. Vial, "An experimental study of OFDM in software defined radio systems using GNU platform and USRP2 devices," in Advanced Technology for Communications (ACT 2014), 2014, pp. 657-662.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4519&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3502

Start Page


  • 657

End Page


  • 662

Place Of Publication


  • United States

Abstract


  • Orthogonal Frequency Division Multiplexing

    (OFDM) has been well examined in the literature via theoretical

    simulations. However, implementation of OFDM in actual

    hardware using Software Defined Radio (SDR) concepts

    and verification of its performance with different channel

    estimation methods in various propagation environments have

    been almost unexplored. The great flexibility feature of SDR

    systems facilitates the implementation and experimentation

    of OFDM systems with less cost and effort, compared to

    the implementation of the whole system in hardware. In this

    paper, a customized SDR testbed has been developed based

    on the GNU radio software platform and version-2 Universal

    Software Radio Peripheral (USRP2) devices to evaluate the

    practical error performance of OFDM-based systems in both

    Gaussian and Rician propagation environments. Three different

    channel interpolation techniques, namely linear interpolation,

    second-ordered interpolation and cubic spline interpolation, and

    a blind SNR estimation algorithm have been implemented in

    our testbed. The performances show that, as opposed to our

    intuition, linear channel interpolation in some cases might not

    only be simpler, but also more accurate than the two other

    non-linear interpolation techniques, implying that channels

    might change linearly between neighboring subcarriers. The

    experimental OFDM system on the developed SDR testbed

    performs very close to the simulated OFDM system, thus

    the developed testbed can be used to verify advanced signal

    processing techniques in OFDM systems in various realistic

    channels by simply developing software, without the need for

    otherwise complicated hardware developments.

Publication Date


  • 2014

Citation


  • L. Chung. Tran, D. Toan. Nguyen, F. Safaei & P. James. Vial, "An experimental study of OFDM in software defined radio systems using GNU platform and USRP2 devices," in Advanced Technology for Communications (ACT 2014), 2014, pp. 657-662.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4519&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3502

Start Page


  • 657

End Page


  • 662

Place Of Publication


  • United States