| CARRIER FREQUENCY OFFSET ESTIMATION FOR INTERLEAVED OFDMA UPLINK BASED ON SUBSPACE PROCESSING |
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| 作者姓名： | Fan Da Cao Zhigang |
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| 作者单位： | State Key Laboratory on Microwave and Digital Communications, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China |
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| 基金项目： | Supported by the Specialized Research Fund for the Doctoral Program of Higher Education, China Ministry of Education （No.20030003039）. |
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| 摘 要： | This paper investigates Carrier Frequency Offset （CFO）, estimation in the uplink of the Orthogonal Frequency-Division Multiple Access （OFDMA） systems with the interleaved subcarrier assignment. CFOs between the transmitters and the uplink receiver will destroy orthogonality among different subcarriers, hence resulting in inter-carrier interference and multiuser interference. A two-stage frequency offset estimation algorithm based on subspace processing is proposed. The main advantage of the proposed method is that it can obtain the CFOs of all users simultaneously using only one OFDMA block. Compared with the previously known methods, it not only has a relatively low implementation complexity but is also suitable for random subchannel assignment.
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| 关 键 词： | 正交频分复用信道 载波频率偏移 子空间处理 均方跟根误差 |
| 收稿时间： | 15 May 2006 |
| 修稿时间： | 2006-05-152006-11-06 |
Carrier Frequency Offset estimation for interleaved OFDMA uplink based on subspace processing |
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| Fan Da Cao Zhigang.CARRIER FREQUENCY OFFSET ESTIMATION FOR INTERLEAVED OFDMA UPLINK BASED ON SUBSPACE PROCESSING[J].Journal of Electronics,2007,24(4):433-438. |
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| Authors: | Fan Da Cao Zhigang |
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| Affiliation: | State Key Laboratory on Microwave and Digital Communications, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | This paper investigates Carrier Frequency Offset (CFO) estimation in the uplink of the Orthogonal Frequency-Division Multiple Access (OFDMA) systems with the interleaved subcarrier assignment. CFOs between the transmitters and the uplink receiver will destroy orthogonality among different subcarriers, hence resulting in inter-carrier interference and multiuser interference. A two-stage frequency offset estimation algorithm based on subspace processing is proposed. The main advantage of the proposed method is that it can obtain the CFOs of all users simultaneously using only one OFDMA block. Compared with the previously known methods, it not only has a relatively low implementation complexity but is also suitable for random subchannel assignment. |
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| Keywords: | Orthogonal Frequency-Division Multiple Access (OFDMA) Carrier Frequency Offset (CFO) Subspace processing Normalized Root Mean Square Error (NRMSE) |
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