An Improved Approach of Pilot Design for MIMO OFDM Systems
一种改进的MIMO OFDM系统导频设计方案

For Multi-Input Multi-Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) systems with virtual subcarriers, conventional equispaced pilot tones are no longer applicable in some situations. To obtain the optimal pilot sequence in such cases, this paper proposes an improved pilot-design approach based on the criterion of minimum Mean-Square-Error (MSE) of the Least Squares (LS) channel estimate. The proposed approach can quickly and efficiently find the optimal pilot sequence, or suboptimal pilot sequences when the optimal ones do not exist. The simulation results demonstrate the effectiveness of the proposed approach.