| Shen Jing( 申京),Wu Muqing.[J].高技术通讯(英文),2012,18(2):195~201 |
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| LMMSE-based SAGE channel estimation and data detection joint algorithm for MIMO-OFDM system① |
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| DOI： |
| 中文关键词: |
| 英文关键词: multi-input multi-output (MIMO), orthogonal frequency division multiplexing (OFDM), linear minimum mean square error (LMMSE), space-alternating generalized expectation-maximization (SAGE), iteration, channel estimation, data detection, joint algorithm. |
| 基金项目: |
| Author Name | Affiliation | | Shen Jing( 申京) | | | Wu Muqing | |
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| 中文摘要: |
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| 英文摘要: |
| A new channel estimation and data detection joint algorithm is proposed for multi-input multi-output (MIMO) -orthogonal frequency division multiplexing (OFDM) system using linear minimum mean square error (LMMSE)-based space-alternating generalized expectation-maximization (SAGE) algorithm. In the proposed algorithm, every sub-frame of the MIMO-OFDM system is divided into some OFDM sub-blocks and the LMMSE-based SAGE algorithm in each sub-block is used. At the head of each sub-frame, we insert training symbols which are used in the initial estimation at the beginning. Channel estimation of the previous sub-block is applied to the initial estimation in the current sub-block by the maximum-likelihood (ML) detection to update channel estimatjon and data detection by iteration until converge. Then all the sub-blocks can be finished in turn. Simulation results show that the proposed algorithm can improve the bit error rate (BER) performance. |
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