Channels estimation in OFDM system over Rician fading channel based on comb-type pilots arrangement

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Channels estimation in OFDM system over Rician fading channel based on comb-type pilots arrangement

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Orthogonal frequency-division multiplexing (OFDM) is a transmission technique that is based on many orthogonal carriers that are transmitted simultaneously. Channel estimation techniques for OFDM systems, based on comb-type pilot arrangement, over frequency-selective Rician and time-varying fading channel are investigated. The advantage of comb-type pilot arrangement, in channel estimation, is the ability to track the variation in the channel, which is the main reason for inter-carrier interference modelled as an additive white Gaussian noise, leading to an increase in the noise level. The estimation of the channel at the pilot frequencies is based on least-square (LS) method. Several interpolation methods have been used to estimate the channel response at the data frequency. In this study, simulation results for Rician channel model were examined and bit error rate/signal-to-noise ratio performance, for various conditions, were considered, and the pilot arrangement was used with the LS estimation and low-pass interpolation techniques, leading to a reduction in the effect of Doppler frequency.

Inspec keywords: Rician channels; error statistics; least squares approximations; channel estimation; AWGN channels; time-varying channels; interpolation; OFDM modulation; intercarrier interference

Other keywords: low pass interpolation techniques; pilot frequency; OFDM system; time varying fading channel; bit error rate; channel estimation; frequency selective Rician fading channel; intercarrier interference; orthogonal frequency division multiplexing; comb-type pilot arrangement; additive white Gaussian noise; least square method; Doppler frequency reduction

Subjects: Interpolation and function approximation (numerical analysis); Communication channel equalisation and identification; Radio links and equipment; Electromagnetic compatibility and interference; Other topics in statistics; Modulation and coding methods

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