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A Cyclic Shift Relaying Scheme for Asynchronous Two-way Relay Networks

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Abstract

Perfect time synchronization among multiple relay nodes is quite difficult to realize in distributed relay networks. In this paper, we proposed a cyclic prefix (CP) assisted cyclic shift relaying (CFR) scheme for asynchronous two-way amplify-and-forward (AF) relay networks over flat fading channels. In the proposed scheme, a CP is inserted at the two source nodes to combat the asynchronous delays. Each relay amplifies the received mixed asynchronous signals after CP removal, and a cyclic delay is introduced to further improve the system performance. With the CP and the cyclic delay, the multiple flat fading relay channels are transformed into a multipath fading channel. As a result, low complexity frequency domain equalizers, such as zero-forcing and minimum mean square error (MMSE) equalizer, can be used to recover the transmit signal. Furthermore, the performance of the proposed CFR scheme with MMSE equalizer is analyzed and closed-form expression for the lower bound of uncoded bit error rate (BER) performance is derived. Based upon this lower bound, we also investigate the power allocation among the sources and the relays to improve the system performance. Finally, extensive numerical results are provided to show the BER and frame error rate performance of the proposed CFR scheme.

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Acknowledgments

This work was supported by the Natural Science Foundation of China under Grant No.71071145, and the Natural Science Foundation of Zhejiang Province under Grant No. Y13F010057.

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Authors and Affiliations

  1. School of Electronic and Information Engineering, Zhejiang Wanli University, Ningbo, Zhejiang, 315100, China

    Zhaoxi Fang, Feng Liang, Shaozhong Zhang & Tao Peng

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  1. Zhaoxi Fang
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  2. Feng Liang
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  3. Shaozhong Zhang
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Correspondence to Zhaoxi Fang.

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Fang, Z., Liang, F., Zhang, S. et al. A Cyclic Shift Relaying Scheme for Asynchronous Two-way Relay Networks. Wireless Pers Commun 71, 2863–2876 (2013). https://doi.org/10.1007/s11277-012-0975-x

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