KSII Transactions on Internet and Information Systems (TIIS)

Korean Society for Internet Information (한국인터넷정보학회)
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Opportunistic Multiple Relay Selection for Two-Way Relay Networks with Outdated Channel State Information

  • Lou, Sijia (Wireless Communications Key Lab of Jiangsu Province Nanjing University of Posts and Telecommunications) ;
  • Yang, Longxiang (Wireless Communications Key Lab of Jiangsu Province Nanjing University of Posts and Telecommunications)
  • Received : 2013.08.13
  • Accepted : 2014.01.18
  • Published : 2014.02.27
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Abstract

Outdated Channel State Information (CSI) was proved to have negative effect on performance in two-way relay networks. The diversity order of widely used opportunistic relay selection (ORS) was degraded to unity in networks with outdated CSI. This paper proposed a multiple relay selection scheme for amplify-and-forward (AF) based two-way relay networks (TWRN) with outdated CSI. In this scheme, two sources exchange information through more than one relays. We firstly select N best relays out of all candidate relays with respect to signal-noise ratio (SNR). Then, the ratios of the SNRs on the rest of the candidate relays to that of the Nth highest SNR are tested against a normalized threshold ${\mu}{\in}[0,1]$, and only those relays passing this test are selected in addition to the N best relays. Expressions of outage probability, average bit error rate (BER) and ergodic channel capacity were obtained in closed-form for the proposed scheme. Numerical results and Simulations verified our theoretical analyses, and showed that the proposed scheme had significant gains comparing with conventional ORS.

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References

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