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Hierarchical modulation-based cooperation utilizing relay-assistant full-duplex diversity

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Abstract

In this paper, we present a hierarchical modulation-based cooperation (HMC) scheme to overcome capacity degradation due to half-duplex transmissions in conventional cooperative relay systems. In the HMC scheme, two relay terminals are used for both transmit and receive operations, i.e., full-duplex transmission. This scheme reduces the required number of time slots for cooperation. Utilizing this cooperative mechanism, the HMC scheme achieves cooperative diversity at the destination node by combining the signals delivered from the source and relay nodes. In addition, we derive a closed form of the end-to-end bit error rate for the HMC scheme, which is utilized to determine an optimal power ratio for hierarchical signals at the source node. In concurrence with the HMC scheme, we develop the best relay selection scheme for a practical wireless communication networks.

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Notes

  1. The hierarchical modulation method is similar to superposition coding [4]. From the viewpoint of functionality, the two modulation schemes are identical. Thus, in the introduction, we investigate relaying schemes based on these modulations. The details are described in Sect. 3.1.

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Acknowledgments

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2010-0011995). This work was supported by the IT R&D program of MKE/KEIT. [KI002091, Research on Multiple Antenna and Multi-hop Relay Transmission Technologies for Next Generation Mobile Broadcasting Service].

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  1. Yonsei University, Seoul, Korea

    Hyukmin Son, Jongrok Park & Sanghoon Lee

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  1. Hyukmin Son
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  2. Jongrok Park
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  3. Sanghoon Lee
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Correspondence to Sanghoon Lee.

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Son, H., Park, J. & Lee, S. Hierarchical modulation-based cooperation utilizing relay-assistant full-duplex diversity. Wireless Netw 17, 583–595 (2011). https://doi.org/10.1007/s11276-010-0298-3

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