| 适用于恒定模值调制的OFDM系统的载波频偏跟踪算法 |
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| 引用本文： | 许炜阳,陆波,洪志良. 适用于恒定模值调制的OFDM系统的载波频偏跟踪算法[J]. 小型微型计算机系统, 2010, 31(5) |
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| 作者姓名： | 许炜阳 陆波 洪志良 |
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| 作者单位： | 复旦大学,专用集成电路与系统国家重点实验室,上海,201203 |
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| 基金项目： | 上海-应用材料与发展基金，英特尔公司研究委员会共同资助 |
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| 摘 要： | OFDM系统对载波频偏十分敏感.提出一种适用于恒定模值调制的OFDM系统的载波频偏跟踪算法.基于信道频率响应已经由帧前部的训练符号估算出来并且在一个帧内保持不变这一合理假设,本文证明可以通过最小化接收信号和已知信道频率响应的能量差来获得频偏估计.文中详细分析算法的可分辨性问题并且给出算法的简化形式.然后理论推导出算法估计的均值和均方差.最后分析了信道估计误差对算法性能的影响,结果显示本算法对信道估计误差不敏感.仿真结果表明较之于现有方法,该跟踪算法有更好的误码率性能.
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| 关 键 词： | 恒定模值调制 载波频偏跟踪 信道频率响应 |
Carrier Frequency Offset Tracking for Constant Modulus Signaling Based OFDM Systems |
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| XU Wei-yang,LU Bo,HONG Zhi-liang. Carrier Frequency Offset Tracking for Constant Modulus Signaling Based OFDM Systems[J]. Mini-micro Systems, 2010, 31(5) |
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| Authors: | XU Wei-yang LU Bo HONG Zhi-liang |
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| Affiliation: | XU Wei-yang,LU Bo,HONG Zhi-liang(State Key Laboratory of Application Specific Integrated Circuits , Systems,Fudan University,Shanghai 201203,China) |
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| Abstract: | OFDM is vulnerable to the carrier frequency offset (CFO). Presented a CFO tracking algorithm for constant modulus signaling based OFDM systems. Based on the reasonable assumption that the channel frequency response (CFR) has been estimated by training symbols and keeps constant during one frame,we prove that the CFO can be estimated through minimizing the power difference between received signal and the CFR. We analyze the identifiability problem and exploit the polynomial rooting method to simplify our alg... |
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| Keywords: | OFDM |
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