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Cooperative Space–Time Coding with Amplify-and- Forward Relaying

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Abstract

Cooperative diversity using distributed space-time codes has been recently proposed to form virtual antennas in order to achieve diversity gain. In this paper, we consider a multi-relay network operating in amplify-and-forward (AAF) mode. Motivated by protocol III presented in (Nabar et al. 2004), we propose a cooperative diversity protocol implementing space–time coding for an arbitrary number of relay nodes when the source-destination link contributes in the second phase. We consider the use of real-orthogonal and quasi-orthogonal designs of space–time codes as they give better performance than random linear-dispersion codes. The pairwise error probability (PEP) has been derived and the theoretical analysis demonstrates that the proposed protocol achieves a diversity of order N + 1, where N is the number of relay nodes. No instantaneous channel state information is required at the relay nodes. The optimum power allocation that minimizes the PEP is obtained with numerical and theoretical analysis. The aggregate system power constraint is considered in the optimization. Simulation results demonstrate an improvement over the existing orthogonal protocols for different source-destination channel conditions. The results also show that the proposed scheme is robust to the channel estimation errors

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Authors and Affiliations

  1. Faculty of Electronic Engineering, Department of Electronics and Electrical Communications, Menoufia University, Menouf, 32952, Egypt

    Azzam Y. Al-nahari, Moawad I. Dessouky & Fathi E. Abd El-Samie

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  1. Azzam Y. Al-nahari
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  2. Moawad I. Dessouky
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  3. Fathi E. Abd El-Samie
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Correspondence to Azzam Y. Al-nahari.

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Al-nahari, A.Y., Dessouky, M.I. & Abd El-Samie, F.E. Cooperative Space–Time Coding with Amplify-and- Forward Relaying. J Sign Process Syst 67, 129–138 (2012). https://doi.org/10.1007/s11265-010-0516-3

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  • DOI: https://doi.org/10.1007/s11265-010-0516-3

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