The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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A Channel Assignment Technique for OFDMA-based Wireless Mesh Network with Different Time Delays

서로 다른 지연 시간을 갖는 OFDMA 기반 Wireless Mesh Network에서의 채널 할당 기법

  • Yoo, Hyun-Il (School of Electrical & Electronic Engineering, Chung-Ang University) ;
  • Park, Chang-Hwan (School of Electrical & Electronic Engineering, Chung-Ang University) ;
  • Cho, Yong-Soo (School of Electrical & Electronic Engineering, Chung-Ang University)
  • Received : 2011.01.04
  • Accepted : 2011.05.13
  • Published : 2011.06.30
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Abstract

In this paper, a channel assignment technique to mitigate interferences due to ISI(Inter Symbol Interference) and ICI(Inter Carrier Interference) caused by TDoA(Time Difference of Arrival) among distributed MRs(Mesh Routers) in OFDMA(Orthogonal Frequency Division Multiple Access)-based WMN(Wireless Mesh Network) is proposed. The SINR(Signal to Interference and Noise Ratio) associated with the channel assignment for each MR is defined to minimize the effect of ISI and ICI due to TDoA in WMN, which is then used to propose an channel assignment technique considering fairness constraint. It is verified by computer simulation that the proposed channel assignment technique can improve the performance of BER(Bit Error Rate) in WMNs with compared to the conventional technique.

본 논문에서는 OFDMA(Orthogonal Frequency Division Multiple Access)기반의 WMN(Wireless Mesh Network)에서 분산 MR(distributed Mesh Router)간 TDoA(Time Difference of Arrival)에 의한 ISI(Inter-Symbol Interference) 및 ICI(Inter-Carrier Interference) 간섭을 완화시키기 위한 자원할당 기법을 제안한다. WMN에서 서로 다른 지연 시간에 따른 ISI와 ICI의 영향을 최소화하기 위하여 각 MR별로 자원할당에 따른 SINR을 정의하고, 이를 바탕으로 fairness를 고려한 자원 할당 기법을 제안한다. 제안된 자원할당 기법은 기존의 기법과 비교하여 WMN에서 BER 성능을 크게 향상시킬 수 있음을 모의실험을 통하여 확인한다.

Keywords

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