非冗余块预编码MIMO-OFDM系统盲信道估计算法

doi:10.3969/j.issn.1001-2400.2018.04.006

Abstract

Abstract:

The conventional blind channel estimation algorithms for MIMO-OFDM systems use block precoding to avoid the imperfection of subspace methods, which causes the distortion of a part of transmit information. To resolve this problem, a new non-redundant block precoding algorithm is proposed. Transmit signals are reshaped by parity, and then precoded by a block precoder, so that the autocorrelation matrix of receive signals has a block structure. The two diagonal blocks are chosen to obtain channel estimation, respectively. Then conditions the precoder should meet and the impact on the channel estimation and system bits error produced by the precoder are discussed. Based on the discussion, a designed balance operation is applied in the two estimations to obtain the final estimation. Simulation results demonstrate that the block precoding method can lead to a better performance of blind channel estimation while achieving a lower bits error.

Key words: block precoding, multiple-input multiple-output orthogonal frequency division multiplexing, blind channel estimation

YANG Ruonan;LOU Shuntian;ZHANG Weitao. Blind channel estimation for MIMO-OFDM systems via non-redundant block precoding[J].Journal of Xidian University, 2018, 45(4): 29-33.

References

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Blind channel estimation for MIMO-OFDM systems via non-redundant block precoding

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