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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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An Efficient Power Allocation Algorithm in OFDM-based Wireless Sensor Networks using Reserve Power

OFDM 기반 무선 센서 네트워크에서의 Reserve Power를 이용한 효율적인 파워 할당 알고리즘

  • Kim, Byung-Ho (Department of Computer Science and Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Oh, Seoung-Youl (Department of Computer Science and Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Kim, Chee-Ha (Department of Computer Science and Engineering, Pohang University of Science and Technology (POSTECH))
  • Received : 2010.10.06
  • Accepted : 2010.12.09
  • Published : 2010.12.31
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Abstract

Orthogonal Frequency Division Multiplexing (OFDM) has been investigated as promising technology for future broadband communication. In this paper, we propose a power allocation algorithm for a frequency selective fading channel. However, many investigated algorithms that perform high computation overhead are not appropriate for sensor network systems due to hardware limitations. The proposed algorithm significantly reduces computational overhead and satisfies the power budget. Throughput of the algorithm is comparable to the optimum solution. Simulation results support the claim stated.

OFDM은 높은 데이터 전송율을 지원할 수 있는 기술로 미래의 광대역 통신에 촉망받는 통신 방식이다. 이 논문은 주파수 선택적 페이팅 채널 환경에서 파워 예산을 각 부채널 상태에 적합하게 할당하는 알고리즘을 제안한다. 하지만 센서 네트워크의 하드웨어 제약상 기존의 파워할당 알고리즘을 적용하면 높은 계산 복잡도 때문에 실제 적용하는데 문제가 있다. 제안된 방식은 실제 환경과 비슷하게 구현되었으며 계산 복잡도를 현저히 줄여 최적의 방식에 비교할 수 있는 동시에 정해진 파워 예산을 만족 시킬 수 있다. 또한, 제안한 방식의 throughput은 최적의 throughput을 보여주는 알고리즘과 비교될 수 있을 정도의 성능을 낸다. 시뮬레이션 결과를 통해 기존 제안된 방식보다 throughput, 계산 복잡도가 뛰어남을 보여준다.

Keywords

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