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DFT-S-OFDM系统中基于DFT的软迭代信道估计
武建荣,慕福奇,高子旺
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(1.中国科学院物联网研究发展中心,江苏 无锡 214135;2.中国科学院大学 微电子学院,北京 100049;2.中国科学院大学 微电子学院,北京 100049;3.江苏中科羿链通信技术有限公司,江苏 无锡 214135)
摘要:
在基于傅里叶变换扩展的正交频分复用(DFT-S-OFDM)系统中,为了消除由多径传播和多普勒效应导致的信道间干扰(ICI),提出了一种基于离散傅里叶变换(DFT)的软迭代信道估计算法。该算法将传统DFT信道估计技术与Turbo均衡技术相结合,利用Turbo均衡器反馈的软信息来更新初始信道估计响应,进而消除噪声和ICI。Matlab仿真结果表明,在多径信道下,经过2次以上的迭代后,该算法的误码率(BER)性能得到了显著的改善。
关键词:  基于傅里叶变换扩展的正交频分复用  迭代信道估计  Turbo均衡  最小均方滤波
DOI:
基金项目:新疆科技厅重大专项项目(2016A3007-5)
Soft iterative channel estimation based on DFT transform for DFT-S-OFDM systems
WU Jianrong,MU Fuqi,GAO Ziwang
(1.CAS R&D Center for Internet of Things,Wuxi 214135,China;2.School of Microelectronics,University of Chinese Academy of Sciences,Beijing 100049,China;2.School of Microelectronics,University of Chinese Academy of Sciences,Beijing 100049,China;3.Jiangsu Zhongke Yilian Communication Technology Co.,Ltd.,Wuxi 214135,China)
Abstract:
In order to eliminate the inter-channel interference(ICI) caused by the multipath propagation and Doppler effect in Discrete Fourier Transform Spread Orthogonal Frquealy Division Multiplexing(DFT-S-OFDM) systems,a soft iterative channel estimation algorithm based on DFT is proposed.The algorithm combines the traditional DFT channel estimation with Turbo equalization and uses the soft information fed back from the Turbo equalizer to update the response of the initial channel estimation,and then eliminate the noise and ICI.The Matlab simulation results show that the proposed algorithm can significantly improve the bit error rate(BER) performance through more than 2 iterations in multipath channels.
Key words:  DFT-S-OFDM  iterative channel estimation  Turbo equalization  LMS filtering
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