Symbol Timing Estimation for Physical-layer Network Coding

Dang Xiao-yu; Li Qiang; Yu Xiang-bin; Wang Xu-dong

doi:10.11999/JEIT141364

Volume 37 Issue 7

Jul. 2015

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Article Navigation > Journal of Electronics & Information Technology > 2015 > 37(7): 1569-1574

Dang Xiao-yu, Li Qiang, Yu Xiang-bin, Wang Xu-dong. Symbol Timing Estimation for Physical-layer Network Coding[J]. Journal of Electronics & Information Technology, 2015, 37(7): 1569-1574. doi: 10.11999/JEIT141364

Citation:

Dang Xiao-yu, Li Qiang, Yu Xiang-bin, Wang Xu-dong. Symbol Timing Estimation for Physical-layer Network Coding[J]. Journal of Electronics & Information Technology, 2015, 37(7): 1569-1574. doi: 10.11999/JEIT141364

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Symbol Timing Estimation for Physical-layer Network Coding

doi: 10.11999/JEIT141364

Received Date: 2014-10-27
Rev Recd Date: 2015-01-06
Publish Date: 2015-07-19

Abstract

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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References(19)

References

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