KSII Transactions on Internet and Information Systems (TIIS)

  • 제12권1호
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  • Pages.178-203
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  • 2018
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  • 1976-7277(pISSN)
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  • 1976-7277(eISSN)
한국인터넷정보학회 (Korean Society for Internet Information)
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FER Performance Evaluation and Enhancement of IEEE 802.11 a/g/p WLAN over Multipath Fading Channels in GNU Radio and USRP N200 Environment

  • Alam, Muhammad Morshed (Department of Electrical and Electronic Engineering, Islamic University of Technology) ;
  • Islam, Mohammad Rakibul (Department of Electrical and Electronic Engineering, Islamic University of Technology) ;
  • Arafat, Muhammad Yeasir (Department of Electrical and Electronic Engineering, Independent University) ;
  • Ahmed, Feroz (Department of Electrical and Electronic Engineering, Independent University)
  • 투고 : 2017.02.14
  • 심사 : 2017.10.12
  • 발행 : 2018.01.31
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초록

In this paper, authors have been evaluated the Frame Error Rate (FER) performance of IEEE 802.11 a/g/p standard 5 GHz frequency band WLAN over Rayleigh and Rician distributed fading channels in presence of Additive White Gaussian Noise (AWGN). Orthogonal Frequency Division Multiplexing (OFDM) based transceiver is implemented by using real-time signal processing frameworks (IEEE 802.11 Blocks) in GNU Radio Companion (GRC) and Ettus USRP N200 is used to process the symbol over the wireless radio channel. The FER is calculated for each sub-carrier conventional modulation schemes used by OFDM such as BPSK, QPSK, 16, 64-QAM with different punctuated coding rates. More precise SNR is computed by modifying the SNR calculation process of YANS and NIST error rate model to estimate more accurate FER. Here, real-time signal constellations, OFDM signal spectrums etc. are also observed to find the effect of multipath propagation of signals through flat and frequency selective fading channels. To reduce the error rate due to the multipath fading effect and Doppler shifting, channel estimation (CE) and equalization techniques such as Least Square (LS) and training based adaptive Least Mean Square (LMS) algorithm are applied in the receiver. The simulation work is practically verified at GRC by turning into a pair of Software Define Radio (SDR) as a simultaneous transceiver.

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참고문헌

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