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Interference mitigation in Z-channel and relay-assisted Z-channel: a diversity gain region perspective

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Abstract

This work considers the interference management in Z-channel and full-duplex decode-and-forward (FD DF) relay-assisted Z-channel. In the case of Z-channel, closed-form expressions for the achievable diversity gain regions (DGRs) with both single-user (SU) codes and multi-user (MU) codes are presented. The closed-form expression for the achievable DGR of the clustered FD DF relay-assisted Z-channel with SU codes is also presented. In the Z-channel, if the interference-free receiver is constrained to operate at optimal diversity multiplexing tradeoff (DMT), the SU codes are shown to achieve better DGR than MU codes. Furthermore, in the Z-channel, the SU codes achieve DGR outer bound at low multiplexing gain region, and MU codes can never achieve DGR outer bound. Also, we have shown that Z-channel with two co-located antennas at the interfering transmitter achieves better DGR compared to that of the clustered FD DF relay-assisted Z-channel with single antenna at the interfering transmitter.

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Acknowledgments

The authors would like to thank Qian (Clara) Li for providing valuable insights on the interference channels. The authors would like thank the editor and anonymous reviewers whose feedback helped us to improve the quality of the paper.

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Authors and Affiliations

  1. CNCL, School of Computer Engineering, Nanyang Technological University, Singapore, Singapore

    Rajendra Prasad Sirigina

  2. School of Computer Engineering, Nanyang Technological University, Singapore, Singapore

    A. S. Madhukumar

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  1. Rajendra Prasad Sirigina
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  2. A. S. Madhukumar
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Correspondence to Rajendra Prasad Sirigina.

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Sirigina, R.P., Madhukumar, A.S. Interference mitigation in Z-channel and relay-assisted Z-channel: a diversity gain region perspective. Wireless Netw 23, 51–63 (2017). https://doi.org/10.1007/s11276-015-1125-7

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  • DOI: https://doi.org/10.1007/s11276-015-1125-7

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