Channel Estimation Model for Multi-carrier System in Fast Random-varying Channel with Optimum Spectral Utilization
Keywords:Orthogonal frequency division multiplexing, pilot added channel estimation, decision-direct channel estimation, spectral efficiency.
AbstractThis paper proposes a novel channel estimation model for multi-carrier system like orthogonal frequency division multiplexing (OFDM) to attain optimum spectral utilization in a fast random-varying wireless channel. To achieve optimal balance between spectral utilization and maintaining target quality of reception, the estimation process switches between pilot based and non-pilot based estimation techniques depending on temporal correlation between frequency domain channel state information (CSI) of two successive OFDM blocks. This paper also evaluates the performance of proposed model with different correlation measuring techniques. The simulation results show that the proposed estimation model provides the quality close to the pilot based system while the spectrum utilization is as high as non-pilot based estimation technique.
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