| OFDMA系统上行链路频偏的盲估计 |
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| 引用本文： | 丁腾波,李式巨,杨路.OFDMA系统上行链路频偏的盲估计[J].电路与系统学报,2009,14(5). |
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| 作者姓名： | 丁腾波 李式巨 杨路 |
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| 作者单位： | 1. 浙江大学,信电系,信息与通信工程研究所,浙江,杭州,310027;浙江省电力设计院,浙江,杭州,310012
2. 浙江大学,信电系,信息与通信工程研究所,浙江,杭州,310027 |
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| 摘 要： | 本文介绍了直接数字频率合成技术DDS(Direct Digital Frequency Synthesizers)工作原理,分析了其理想频谱;采用信号分析的方法深入研究了DDS存在相位截断和幅度量化时引入的杂散信号频谱分布的规律和性能;定性讨论了DAC非理想性对DDS输出杂散谱的影响.最后进行计算机仿真分析并验证了结论.所得规律性结论为DDS设计和工程应用开发中的参数选取、杂散评估和杂散抑制提供重要的理论依据和经验参考.
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| 关 键 词： | 直接数字合成 相位截断 幅度量化 DAC非理想性 杂散信号 |
Blind estimation of frequency offset for OFDMA uplink |
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| DING Teng-bo,LI Shi-ju,YANG Lu.Blind estimation of frequency offset for OFDMA uplink[J].Journal of Circuits and Systems,2009,14(5). |
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| Authors: | DING Teng-bo LI Shi-ju YANG Lu |
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| Affiliation: | DING Teng-bo1,2,LI Shi-ju1,YANG Lu1(1.Institute of Information , Communication Engineering,Zhejiang University,Hangzhou 310027,China,2.Zhejiang Electric Power Design Institute,Hangzhou 310012,China) |
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| Abstract: | The real challenge of synchronization in OFDMA exists in the OFMDA uplink.For the OFDMA uplink,this paper,a blind estimation algorithm of frequency offset based on the improved music algorithm is presented,which use the conjugate autocorrelation of the received signal,and this blind algorithm can estimate the frequency offset of each user without the help of any pilot or training sequence.The performance of high resolution and immune to the effect of noise and interference is evaluated through the simulatio... |
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| Keywords: | OFDMA |
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