多径信道下OFDM系统的采样频率偏移盲估计方法

doi:10.3969/j.issn.1001-2400.2014.04.016

J4 ›› 2014, Vol. 41 ›› Issue (4): 87-93.doi: 10.3969/j.issn.1001-2400.2014.04.016

多径信道下OFDM系统的采样频率偏移盲估计方法

李兵兵;孙珺;刘明骞

(西安电子科技大学综合业务网理论及关键技术国家重点实验室，陕西西安 710071)

收稿日期:2013-01-21 出版日期:2014-08-20 发布日期:2014-09-25
通讯作者: 李兵兵
作者简介:李兵兵(1955-)，男，教授，E-mail: bbli@mail.xidian.edu.cn．
基金资助:
国家自然科学基金资助项目(61271299)；国家"863"高技术研究发展计划资助项目(2007AA01Z288)；高等学校学科创新引智计划资助项目(B08038)

Blind estimation algorithm of sampling frequency offset for the OFDM system over multipath channels

LI Bingbing;SUN Jun;LIU Mingqian

(State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an 710071， China)

Received:2013-01-21 Online:2014-08-20 Published:2014-09-25
Contact: LI Bingbing
About author:

摘要/Abstract

摘要：

为提高实际的非合作通信系统中正交频分复用系统的采样频率偏移估计性能，提出了一种多径衰落环境下、非合作通信系统中、时频同步之前的正交频分复用系统采样偏移估计的新方法．该方法先利用一种改进循环谱对谱相关点进行粗估计，再利用另一种改进的循环谱对谱相关点进行细估计，最后根据估计出的相关点上循环谱的相位值，经跳变转化、最小二乘直线拟合后计算出相位变化率，得到正交频分复用系统采样偏移的估计值．仿真结果表明，该方法在多径信道条件下，比现有的盲估计方法具有更高的估计精度与性能．

关键词: 采样频率偏移, 正交频分复用, 盲估计, 循环谱, 多径信道

Abstract:

In order to improve the performance of sampling frequency offset(SFO) estimation for the Orthogonal Frequency Division Multiplexing(OFDM) system in practical non-cooperation communications, this paper proposes a new sampling frequency offset estimation for the OFDM system estimation algorithm in multipath fading channels and the non-cooperation communications system. The proposed algorithm first uses an improved cycle spectrum to make a coarse estimation of the relative point, and then estimates accurately the relative point through another improved cycle spectrum. Finally, the estimated values of sampling frequency offset are obtained by the rate of change of the phase of the cycle spectrum in the relative point after jumping phase change and least square fitting. Simulation results show that the proposed algorithm has not only higher estimation accuracy but also better performance over multipath channels.

Key words: sampling frequency offset, orthogonal frequency division multiplexing, blind estimation, cycle spectrum, multipath channels

李兵兵;孙珺;刘明骞. 多径信道下OFDM系统的采样频率偏移盲估计方法[J]. J4, 2014, 41(4): 87-93.

LI Bingbing;SUN Jun;LIU Mingqian. Blind estimation algorithm of sampling frequency offset for the OFDM system over multipath channels[J]. J4, 2014, 41(4): 87-93.

参考文献

［1］ Laourine A, Stephenne A, Affes S. Blind Sampling Clock Offset Estimation in OFDM System Based on Second Order Statistics ［C］//Proceedings of the 40th Asilomar Conference on Signals, Systems and Computers. Piscataway: IEEE, 2006: 1782-1785.
［2］ Liu G, Li B B, Pang H L. Blind Sampling Clock Offset Estimation Algorithm for OFDM System［C］//Proceedings of the 2009 2nd International Congress on Image and Signal Processing. Piscataway: IEEE, 2009: 1-4.
［3］ Ai B, Shen Y, Zhong Z D, et al. Enhanced Sampling Clock Offset Correction Based on Time Domain Estimation Scheme［J］. IEEE Transactions on Consumer Electronics, 2011, 57(2): 696-704.
［4］王磊, 徐大专. Gardner算法在OFDM 采样率同步中的应用［J］. 电子与信息学报, 2011, 33(4): 864-868.
Wang Lei, Xu Dazhuan. The Application of Gardner algorithm to Sampling Rate Synchronization in OFDM Systems［J］. Journal of Electronics ＆ Information Technology, 2011, 33(4): 864-868.
［5］ Castillo-Sanchez E, Lopéz-Martinez F J, Martos-Naya E, et al. Joint time, Frequency and Sampling Clock Synchronization for OFDM-based Systems［C］//Wireless Communications and Networking Conference. New York: IEEE, 2009: 491776.
［6］胡登鹏, 张尔扬. 非数据辅助的OFDM系统采样频率同步算法［J］. 信号处理, 2010, 26(6): 956-960.
Hu Dengpeng, Zhang Eryang. Non-data-aided Sampling Frequency Synchronization Algorithm for OFDM Systems［J］. Signal Processing, 2010, 26(6): 956-960.
［7］胡登鹏. OFDM系统中的非数据辅助同步及PAPR抑制技术研究［D］. 湖南: 国防科学技术大学, 2010.
［8］ Zahedi-Ghasabeh A, Tarighat A, Daneshrad B. Sampling Clock Frequency Offset Compensation for Feature Detection in Spectrum Sensing［C］//IEEE International Conference on Communications. Piscataway: IEEE Press, 2010: 5501997.
［9］ Zahedi-Ghasabeh A, Tarighat A, Daneshrad B. Spectrum Sensing of OFDM Waveforms Using Embedded Pilots in the Presence of Impairments［J］. IEEE Transactions on Vehicular Technology, 2012, 61(3): 1208-1221.
［10］ Socheleau F X, Houcke S, Ciblat P, et al. Cognitive OFDM System Detection Using Pilot Tones Second and Third-order Cyclostationarity［J］. Signal Processing, 2011, 91(2): 252-268.

[1]	谢凡,冯莉芳. 可见光辅助中继通信系统与功率分配方案[J]. 西安电子科技大学学报, 2020, 47(1): 95-103.
[2]	高洋,项炳龙,宫丰奎. 一种抑制多路OFDM信号峰均比的SG-PTS算法[J]. 西安电子科技大学学报, 2019, 46(5): 128-133.
[3]	谷亚彬;张林让;周宇;赵永红. 采用相关函数的OFDM雷达通信共享信号处理算法[J]. 西安电子科技大学学报, 2018, 45(4): 12-17+105.
[4]	杨若男;楼顺天;张伟涛. 非冗余块预编码MIMO-OFDM系统盲信道估计算法[J]. 西安电子科技大学学报, 2018, 45(4): 29-33.
[5]	沈志威;刘景美;韩庆庆. 一种高度自适应的物理层密钥生成方案[J]. 西安电子科技大学学报, 2018, 45(4): 86-91.
[6]	李升远;张馨恬;唐世阳. 采用OFDM-LFM的MIMO雷达高速目标波形设计[J]. 西安电子科技大学学报, 2018, 45(3): 7-12.
[7]	谷亚彬;张林让;周宇. 采用FRFT-OFDM的雷达通信功能共享方法[J]. 西安电子科技大学学报, 2017, 44(6): 48-52+84.
[8]	戈立军;赵澜;李月;郭徽;李明阳;赵瑞君. 全相位FFT的OFDM系统ΣΔ量化噪声整形[J]. 西安电子科技大学学报, 2017, 44(4): 80-85+117.
[9]	刘海涛;丛婉;尹志胜;李冬霞. 峰值门限脉冲熄灭OFDM接收机符号差错概率[J]. 西安电子科技大学学报, 2017, 44(1): 125-129+164.
[10]	段珍珍;田斌;易克初;李运华. 一种卫星信道下高效QOTDM传输方法[J]. 西安电子科技大学学报, 2017, 44(1): 176-181.
[11]	刘明骞;陈健;李兵兵;郭晓玲. 非合作通信中OFDM系统盲均衡方法[J]. 西安电子科技大学学报, 2016, 43(3): 1-5.
[12]	刘明骞;李兵兵;黄少东. 非合作通信中OFDM系统的载频偏移盲估计方法[J]. J4, 2016, 43(1): 24-29.
[13]	纪金伟;任光亮;张会宁. 一种降低MIMO-OFDM系统PAPR的半盲SLM方法[J]. J4, 2015, 42(5): 13-19+146.
[14]	温鸿航;葛建华;许唐雯. 一种低复杂度OFDM峰均比降低方法[J]. J4, 2015, 42(5): 188-193.
[15]	杨晓炜;甘露. 汉明码参数的快速盲估计算法[J]. J4, 2013, 40(5): 60-65.

多径信道下OFDM系统的采样频率偏移盲估计方法

Blind estimation algorithm of sampling frequency offset for the OFDM system over multipath channels

PDF (PC)

赞

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

Metrics

本文评价

推荐阅读 10