The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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A Complexity Reduced PNFS Algorithm for the OFDM System with Frequency Offset and Phase Noise

주파수 오프셋과 위상 잡음이 있는 OFDM 시스템에서 PNFS 알고리즘 간소화를 통한 복잡도 개선

  • Kim, Do-Hoon (Department of Electronic Engineering, Chungbuk National University) ;
  • Ryu, Heung-Gyoon (Department of Electronic Engineering, Chungbuk National University)
  • Received : 2011.08.05
  • Accepted : 2011.12.16
  • Published : 2012.04.30
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Abstract

In this paper, we analyze the effects of phase noise and frequency offset that cause performance degradation. Basically, we like to propose reduced PNFS(Phase Noise and Frequency offset Suppression) algorithm. The OFDM system is seriously affected by ICI component such as phase noise, frequency offset and Doppler effects. Especially, complicated processing algorithm with high complexity was required it in order to compensate those ICI components. So, we propose PNFS algorithm that can decrease complexity and compensate ICI components. We propose a method decreased complexity by approximation of parameters that affect slightly performance change and compare the quantity of conventional and revised PNFS algorithm. Also, simulation shows that BER performance of revised PNFS algorithm can be improved slightly.

본 논문에서는 OFDM 시스템에서 성능 열화의 요인인 위상 잡음과 주파수 오프셋의 영향을 분석하고, 복잡도 측면에서 개선된 PNFS(Phase Noise and Frequency offset Suppression) 알고리즘을 제안한다. OFDM 시스템에서는 위상 잡음과 주파수 오프셋, 도플러 효과와 같은 ICI 성분에 의해 영향을 많이 받게 된다. 특히 이와 같은 성분들을 보상하기 위해서는 복잡도가 높은 계산을 통하여 처리하게 되어 기저 대역에서 부담이 증가하게 된다. 따라서 복잡도를 줄이면서 ICI 성분을 보상할 수 있는 PNFS 알고리즘을 제안한다. 기존의 PNFS 알고리즘에서 성능 변화가 미미한 파라미터의 계산을 근사화하여 복잡도를 줄이는 방법을 제시하고, 기존의 PNFS 알고리즘과 계산량을 비교하여 개선된 PNFS 알고리즘의 복잡도를 비교한다. 개선된 PNFS 알고리즘의 성능을 비교 분석하고 시뮬레이션을 통하여 검증한다.

Keywords

References

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