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

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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A Study on the Binary-Coded Physical-Layer Network Coding with High-Order Modulation Techniques

고차원 변조방식을 적용한 이진 부호화된 물리계층 네트워크 코딩에 관한 연구

  • Lim, Hyeonwoo (Department of Information and Communication Engineering, Gyeongsang National University) ;
  • Ban, Tae-Won (Department of Information and Communication Engineering, Gyeongsang National University) ;
  • Jung, Bang Chul (Department of Information and Communication Engineering, Gyeongsang National University)
  • Received : 2014.08.05
  • Accepted : 2014.09.05
  • Published : 2014.09.30
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Abstract

In this paper, a binary-coded physical-layer network coding (PNC) is considered when high-order modulation techniques are used at source nodes in wireless communication environments. In the conventional PNC schemes, tight power control and phase compensation are required at a relay node. However, they may not be feasible in practical wireless communication environments. Thus, we do not assume the pre-equalization in this paper, and we only utilize the channel state information at receiver (CSIR). We propose a signal detection method for the binary-coded PNC with high-order modulation, such as QPSK and 16QAM, at the source nodes, while the conventional scheme only consider the BPSK at source nodes. We also analyze the bit-error performance of the proposed technique in both uncoded and coded cases.

본 논문은 무선통신 환경에서 이진 부호화된 네트워크 코딩 기술을 고차원 변조 방식과 결합하는 방식을 다룬다. 기존의 물리계층 네트워크 코딩 기술에서 중계 노드는 2개의 소스 노드에서 수신된 심볼들 사이의 엄격한 전력 제어와 위상 보상을 요구한다. 그러나 무선 페이딩 채널을 고려하면 소스 노드들에서 채널을 미리 알고 보상하는 것은 쉽지 않다. 따라서 본 논문에서는 중계노드에서 수신단 채널 정보만을 이용하는 네트워크 코딩 수신 기법을 고려한다. 특히, 각 소스 노드들이 QPSK, 16QAM 등과 같은 고차원 변조방식을 사용했을 경우 사용할 수 있는 수신 기법을 제안하고, 채널 부호화 기법이 적용되었을 경우와 적용되지 않았을 경우에 대하여 그 성능을 분석한다.

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