Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Effect of Multiple Antennas at a Relay Node on the Performance of Physical-Layer Network Coding in Two-Way Relay Channel

양방향 중계채널에서 중계기 다중안테나가 물리계층네트워크 코딩의 성능에 미치는 영향

  • Park, Jeonghong (Department of Electronics Engineering, Chungnam National University) ;
  • Jung, Bang Chul (Department of Electronics Engineering, Chungnam National University) ;
  • Ban, Tae-Won (Department of Information and Communication Engineering, Gyeongsang National University)
  • Received : 2016.04.14
  • Accepted : 2016.04.23
  • Published : 2016.08.31
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Abstract

In this paper, we investigate the effect of multiple antennas at a relay node on the performance of physical-layer network coding (PNC) in the two-way relay channel (TWRC). We assume that two source nodes have a single antenna and the relay node has multiple antennas. We extend the conventional TWRC environment with a signle antenna at both relay and source nodes to the case of multiple antennas at the relay node. In particular, we consider two decoding strategies: separate decoding (SD) and direct decoding (DD). The SD decodes each packet from the two sources and performs the network coding with bit-wise exclusive OR (XOR) operation, while the DD decodes the network-coded packet from the two sources. Note that both decoding strategies are based on log-likelihood ratio (LLR) computation. It is shown that the bit error rate (BER) performance becomes significantly improved as the number of antennas at the relay node.

본 논문에서는 양방향 중계 채널에서 중계기에 다중안테나가 존재할 경우 물리계층 네트워크 코딩 기법의 성능분석을 수행하였다. 2개의 소스 노드는 하나의 안테나를 가진다고 가정하고 중계기에는 다중안테나가 설치되었다고 가정한다. 본 논문에서는 소스 노드와 중계노드에 각각 하나의 안테나가 존재하는 기존 시스템을 중계기에 다중안테나가 존재하는 환경으로 확장한다. 특히, 중계기에서 2개의 소스 노드들로부터 도착한 패킷을 복호하는 과정에서 각 패캣을 복호한 후 네트워크 부호화를 수행하는 개별복호기술과 소스 노드들로부터 도착한 2개의 패킷을 동시에 고려하여 직접복호하는 기술을 비교분석한다. 다중안테나기반의 중계기를 사용할 경우 물리계층 네트워크 코딩의 비트오류성능이 중계기의 안테나의 개수가 증가함에 따라 향상되는 것을 확인하였다.

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References

  1. S. -Y. R. Li, R. W. Yeung, and N. Cai, "Linear network coding," IEEE Trans. Inf. Theory, vol. 49, no. 2, pp. 371-381, Feb. 2007. https://doi.org/10.1109/TIT.2002.807285
  2. S. Zhang, S. Liew, and P. P.Lam, "Physical-layer network coding," in Proc. of ACM MOBICOM, Sep. 2006.
  3. E. Dahlman, S. Parkvall, J. Skold, and P. Beming, 3G Evolution: HSPA and LTE for mobile broadband, 2nd edition, Elsevier, 2008.
  4. H. Jin, B. C. Jung, H. Y. Hwang, and D. K. Sung, "A MIMO-based collision mitigation scheme in uplink WLANs," IEEE Comm. Lett., vol. 12, No. 6, pp. 417-419, Jun. 2008. https://doi.org/10.1109/LCOMM.2008.071672
  5. F. F. Rusek, D. Persson, B. K. Lau, E. G. Larsson, T. L. Marzetta, O. Edfors, and F. Tufvesson, "Scaling up MIMO: Opportunities and challenges with very large arrays," IEEE Signal Process. Mag., vol. 30, pp. 37-60, Jan. 2013.
  6. M. Huang, J. Yuan, and T. Yang, "Error probability of physical-layer network coding in multiple-antenna two-way relay channel," IEEE GLOBECOM, pp. 4725-4730, Dec. 2012.
  7. D. Soldani and S. Dixit, "Wireless relays for broadband access," IEEE Communi. Mag. vol. 46, no. 3, pp. 58-66, Mar. 2008.
  8. B. C. Jung, "A practical physical-layer network coding for fading channels," International Journal of KIMICS, vol. 8, no. 6, pp. 655-659, Dec. 2010.
  9. S. H. Kim, B. C. Jung, and D. K. Sung, "Transmit power optimization for two-Way relay channels with physicallayer network coding," IEEE Communications Letters, vol. 19, no. 2, pp. 151-154, Feb. 2015. https://doi.org/10.1109/LCOMM.2014.2371996
  10. M. Park, I. Choi and I. Lee, "Exact BER analysis of physical layer network coding for two-way relay channels," in Proc. of IEEE VTC, May 2011.