Journal of Broadcast Engineering (방송공학회논문지)

The Korean Institute of Broadcast and Media Engineers (한국방송∙미디어공학회)
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Subcarrier Allocation for Multiuser in Two-Way OFDMA Relay Networks using Decode-and-Forward Relaying

복호후재전송을 사용하는 양방향 OFDMA 중계 네트워크에서 다중사용자를 위한 부반송파 할당 기법

  • Shin, Han-Mok (Department of Electrical Engineering and INMC, Seoul National Univ.) ;
  • Lee, Jae-Hong (Department of Electrical Engineering and INMC, Seoul National Univ.)
  • 신한목 (서울대학교 전기.컴퓨터공학부, 뉴미디어통신공동연구소) ;
  • 이재홍 (서울대학교 전기.컴퓨터공학부, 뉴미디어통신공동연구소)
  • Received : 2010.08.30
  • Accepted : 2010.11.11
  • Published : 2010.11.30
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Abstract

A two-way relay network provide improved spectral efficiency compared with a conventional one-way relay network by using either superposition coding or network coding. OFDMA network provides imptoved performance by adaptive resource allocation. In this paper, we propose a adaptive subcarrier allocation for a multiuser two-way OFDMA relay network. In the proposed algorithm, subcarriers are allocated to the user-pairs and relays to maximize the achievable sum-rate over all user-pairs while satisfying the minimum rate requirement for each user-pair. Simulation results show that the proposed algorithm provides improved performance compared with the static and greedy algorithms.

양방향 중계 네트워크는 중계기에 중첩 부호화 또는 네트워크 부호화를 적용함으로써 기존의 단방향 중계 네트워크에 비해 향상된 주파수 효율을 제공한다. 한편, OFDMA 네트워크는 사용자에게 부반송파, 파워 등의 자원을 적응적으로 할당하여 네트워크의 성능향상을 얻을 수 있다. 본 논문에서는 복호후재전송을 사용하는 양방향 OFDMA 중계 네트워크에서 다중사용자를 위한 적응적 부반송파 할당 알고리즘을 제안한다. 제안된 알고리즘은 각 사용자 쌍의 최소 전송속도를 보장하며 모든 사용자 쌍에 대한 달성 합 전송속도를 최대화하기 위해 부반송파를 사용자 쌍과 중계기에 적응적으로 할당한다. 모의실험을 통해 제안된 알고리즘이 정적 알고리즘, 그리디 알고리즘 보다 우수한 성능을 보임을 확인한다.

Keywords

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