| Zhang Wei(张薇),Wang Jing,Chen Xiang.[J].高技术通讯(英文),2011,17(4):333~338 |
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| Carrier frequency offset estimation for a generalized OFDMA uplink① |
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| DOI： |
| 中文关键词: |
| 英文关键词: OFDMA uplink, frequency synchronization, maximum likelihood (ML) frequency estimator, linear minimum mean square error (LMMSE) equalization, generalized carrier-allocation scheme (GCAS) |
| 基金项目: |
| Author Name | Affiliation | | Zhang Wei(张薇) | | | Wang Jing | | | Chen Xiang | |
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| 中文摘要: |
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| 英文摘要: |
| A residual carrier frequency offset (CFO) estimation scheme is proposed for the uplink of orthogonal frequency division multiple access (OFDMA) systems. Multiple access interference caused by CFOs in the uplink is investigated, as it severely affects the performance of a classical maximum likelihood (ML) frequency estimator. By the use of the estimated CFOs of the active users, the linear maximum mean square error (LMMSE) equalization is performed before the ML frequency estimator for the interference cancellation, which can help to sufficiently improve the estimation accuracy for the residual CFO of the incoming user. Analysis and simulations show that the modified ML estimator provides a tradeoff between estimation accuracy and computational complexity caused by the LMMSE interference cancellation, and the proposed method allows OFDMA systems flexibly allocating subcarriers to users. |
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