This paper first introduces the MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system model, and then studies several classical channel estimation algorithms: LS(Least Square) algorithm and LMMSE(Liner Minimum Mean-Square Error) algorithms. Finally, based on the Jacobi iterative algorithm for solving linear equations, the original LMMSE algorithm has been improved. Theoretical analysis and simulation results show that: Improved LMMSE algorithm not only can reduce the complexity of the implementation, but also has more superior performance.
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