ABSTRACT
Since 2010, the railway wideband communication system LTE-R based on LTE has been improving; meanwhile, OFDM and MIMO technologies have been applied in high-speed wideband wireless communication systems. However, the OFDM system is exceedingly sensitive to orthogonality. If there is a shift, then it would cause ICI and lead to severe deterioration of system performance. Compared with ZF equalization and adaptable equalization, the comprehensive performance of MMSE equalization is better, although its algorithm is still complex and cannot eliminate ICI completely. We further analyze the MMSE equalization algorithm for a high-speed railway system with a series of problems, and discuss the improvements based on the MMSE equalization algorithm and test the ICI cancellation performance by simulation. Finally, this paper presents the prospects of ICI cancellation methods based on equalization technology.
