物理层网络编码的符号时钟估计

党小宇; 李强; 虞湘宾; 王旭东

doi:10.11999/JEIT141364

物理层网络编码的符号时钟估计

doi: 10.11999/JEIT141364

基金项目:

国家自然科学基金(61172078, 61201208)，教育部留学回国人员科研启动基金和中央高校基本科研业务费(NS2014038)

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出版历程
- 收稿日期: 2014-10-27
- 修回日期: 2015-01-06
- 刊出日期: 2015-07-19

Symbol Timing Estimation for Physical-layer Network Coding

摘要

摘要: 现有的关于物理层网络编码(PNC)的研究多建立在时钟已完全同步的基础上，对PNC的符号时钟同步研究较少。而实际上符号时钟在PNC中是必不可少的。针对这一问题，该文提出一种新的基于正交训练序列适用于双向中继信道PNC的符号时钟估计方法。该方法根据最大似然估计准则，运用基于离散傅里叶变换(DFT)的插值算法来估计时钟误差。仿真结果表明，所提出的DFT插值算法性能优越，在信噪比(SNR)大于10 dB的条件下，系统的均方误差(MSE)性能比经典优选采样点法提升1个数量级，并且非常逼近修正克拉美罗界(MCRB)。
- 无线通信 /
- 物理层网络编码 /
- 双向中继信道 /
- 符号时钟估计 /
- 修正克拉美罗界
Abstract: Most of the existing research on Physical-layer Network Coding (PNC) is based on the assumption that the symbol timing at the relay is ideally synchronized, and rarely discusses the issue of symbol synchronization. However, in practice, the symbol timing is indispensable in PNC systems. To tackle this problem, this paper proposes a novel symbol timing estimation scheme based on the orthogonal training sequences for PNC in two-way relay channels. According to the maximum-likelihood estimation criterion, a Discrete Fourier Transformation (DFT) based interpolation algorithm is applied to improve the estimation accuracy. It is shown by analysis and simulation that the proposed DFT-based symbol timing estimator exhibits superior performance. The Mean Square Error (MSE) performance of the estimator is one order of magnitude better than that of the conventional optimum sample algorithm for Signal-to-Noise Ratio (SNR) greater than 10 dB, and is very close to the Modified Cramer-Rao Bound (MCRB).
- Wireless communication /
- Physical-layer network coding /
- Two-way relay channels /
- Symbol timing estimation /
- Modified Cramer-Rao Bound (MCRB)

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参考文献(19)

Zhang S, Liew S C, and Lam P P. Hot topic: physical-layer network coding[C]. Proceedings of the 12th Annual International Conference on Mobile Computing and Networking, CA, USA, 2006: 358-365.

Liew S C, Zhang S, and Lu L. Physical-layer network coding: tutorial, survey, and beyond[J]. Physical Communication, 2013, 6: 4-42.

沙楠, 高媛媛, 益晓新, 等. 基于连续相位频移键控调制的物理层网络编码检测及性能分析[J]. 电子与信息学报, 2014, 36(6): 1454-1459.

Sha Nan, Gao Yuan-yuan, Yi Xiao-xin, et al.. Physical-layer network coding based on CPFSK modulation detection and performance analysis[J]. Journal of Electronics Information Technology, 2014, 36(6): 1454-1459.

Namboodiri V, Venugopal K, and Rajan B S. Physical layer network coding for two-way relaying with QAM[J]. IEEE Transactions on Wireless Communications, 2013, 12(10): 5074-5086.

吉晓东, 郑宝玉. 物理层网络编码机会中继及中断性能分析[J]. 电子与信息学报, 2011, 33(5): 1186-1192.

Ji Xiao-dong and Zheng Bao-yu. Opportunistic relaying and outage analysis for physical-layer network coding[J]. Journal of Electronics Information Technology, 2011, 33(5): 1186-1192.

Yang T, Yuan X, Ping L, et al.. A new physical-layer network coding scheme with eigen-direction alignment precoding for MIMO two-way relaying[J]. IEEE Transactions on Communications, 2013, 61(3): 973-986.

Duc Hiep V, Van Bien P, and Xuan Nam T. Physical network coding for bidirectional relay MIMO-SDM system[C]. Proceedings of the Advanced Technologies for Communications (ATC), Ho Chi Minh City, Vietnam, 2013: 141-146.

Chang R Y, Lin S J, and Chung W H. Joint-denoise- and-forward protocol for multi-way relay networks[C]. Proceedings of the Signal and Information Processing Association Annual Summit and Conference (APSIPA), Kaohsiung, China, 2013: 1-4.

Chen M and Yener A. Multiuser two-way relaying: detection and interference management strategies[J]. IEEE Transactions on Wireless Communications, 2009, 8(8): 4296-4305.

Mengali U and D,Andrea A N. Synchronization Techniques for Digital Receivers[M]. New York: Plenum Press, 1997: 353-515.

季仲梅, 杨洪生, 王大鸣, 等. 通信中的同步技术及应用[M]. 北京: 清华大学出版社, 2008: 137-148.

Zhang S, Liew S C, and Lam P. On the synchronization of physical-layer network coding[C]. Proceedings of the Information Theory Workshop, Chengdu, China, 2006: 404-408.

Lu L and Liew S C. Asynchronous physical-layer network coding[J]. IEEE Transactions on Wireless Communications, 2012, 11(2): 819-831.

Rohrs U H and Linde L P. Some unique properties and applications of perfect squares minimum phase CAZAC sequences[C]. Proceedings of the Communications and Signal Processing, Cape Town, South Africa, 1992: 155-160.

Feher K. Digital Communications: Satellite/Earth Station Engineering[M]. New Jersey: Prentice Hall, 1983: 346-396.

D,Andrea A N, Mengali U, and Reggiannini R. The modified Cramer-Rao bound and its application to synchronization problems[J]. IEEE Transactions on Communications, 1994, 42(2/4): 1391-1399.

Ozaki K, Tomitsuka K, Okazaki A, et al.. Channel estimation technique for OFDM systems spread by chirp sequences[C]. Proceedings of the 2012 IEEE 23rd International Symposium on Personal Indoor and Mobile Radio Communications (PIMRC), Sydney, Australia, 2012: 2125-2130.

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