Paper Title :The Effects of OFDM Synchronization Imperfections and Calculation of Uncoded Bers for the Idealized OFDM System Model

Author :Lokesh C., Nataraj K. R., Rekha K. R., Mamatha C G

Article Citation :Lokesh C. ,Nataraj K. R. ,Rekha K. R. ,Mamatha C G , (2017 ) " The Effects of OFDM Synchronization Imperfections and Calculation of Uncoded Bers for the Idealized OFDM System Model " , International Journal of Electrical, Electronics and Data Communication (IJEEDC) , pp. 49-53, Volume-5,Issue-4

Abstract : The aim of this paper is to provide some theoretical background on the OFDM transmission technique. We review the block diagram of a “classic” OFDM system, which employs a GI to mitigate the impairments of the multipath radio channel. We also discuss several design considerations related to hardware properties and derive the mathematical model for an idealized system, leading to the conclusion that data symbols can be transmitted independently of each other [i.e., without ISI and intercarrier interference (ICI)]. Moreover, the effects of synchronization imperfections are analyzed, like carrierfrequency and phase offsets and timing errors. Differential and coherent detection schemes can be evaluated for Rayleigh and Rician fading channels. We also show that, for the system proposal under investigation, differential detection in time direction is much preferable to differential detection in frequency direction. Imperfect synchronization and channel estimation may be assessed by extending the system model used and by incorporating the SNR degradations due to ICI and ISI. Basic aspects are discussed in this paper. Issues for further refinement of the methods are addressed. Keywords - frequency-division multiplexing (FDM), Signal carrier(SC), bit error rate (BER), Signal-to-noise ratio (SNR), Inter-symbol interference(ISI), Binary phase-shift keying (BPSK), Quadrature Phase Shift Keying (QPSK)

Type : Research paper

Published : Volume-5,Issue-4

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