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An Improved Approach of Pilot Design for MIMO OFDM Systems |
Hu Die①; He Liang-hua② |
①Department of Communications Science and Engineering, Fudan University, Shanghai 200433,China; ②Department of Computer Science and technology, Tongji University, Shanghai 201804,China |
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Abstract 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Frequency Division Multiplexing (OFDM) systems with virtual subcarriers, conventional equispaced pilot tones are no longer applicable in some situations.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.
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Received: 29 December 2007
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