Non-Biased Linear Approximation Method of CIR for ICI Mitigation in High Mobility OFDM System
Year: 2025
Type: article
Abstract: In orthogonal frequency division multiplexing (OFDM) system, the property of the channel impulse response (CIR) is generally assumed to be time-invariant in one OFDM symbol. However, the assumption is proved wrong in mobile environments, thus leading to inter-carrier interference (ICI) by Doppler spread. A typical solution for this problem is a piece-wise linear approximation to estimate channel time-variations in pilot-aided OFDM mobile systems. Unfortunately, the solution causes biased linear approximation error, which yields the poor performance in the receiver. In this paper, we propose novel non-biased linear approximation of CIR in OFDM mobile systems to mitigate ICI. Theoretical analysis and simulation show that the proposal satisfies the required correlation characteristics without a series of assumptions and outperforms the previous methods in terms of channel estimation.
Authors: HyoSong An, JongSam Ri, NamChol Yu
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7082983535
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