Paper Title
A Review of Adaptive Inter-Carrier Interference Mitigation Schemes for MIMO-OFDM Systems in High-Speed Train Environments

Abstract
High-speed railway (HSR) environments present significant challenges for wireless communications due to effects such as Doppler shifts and inter-carrier interference (ICI). Multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) is a promising technology to address these issues. However, specialized signal processing techniques are required to mitigate ICI in MIMO-OFDM HSR systems. This paper provides a comprehensive review of adaptive interference mitigation schemes for MIMO-OFDM in HSR channels. Both time-domain and frequencydomain techniques are examined, including methods leveraging multiple antennas to suppress ICI. Self-adaptive approaches that tune parameters based on channel conditions are highlighted. Tradeoffs between performance, complexity, and parameter selection are discussed. Results from simulation studies and field trials are summarized to compare the effectiveness of different ICI cancellation schemes. Open issues and promising directions for future research are also identified. The review provides valuable insights to inform the design and optimization of MIMO-OFDM systems for next generation high-speed rail networks. Keywords - High-Speed Railway(HSR); MIMO-OFDM; Inter-Carrier Interference(ICI); Doppler shifts; Adaptive Signal Processing