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

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Performance Evaluation of OFDM Systems Dependent on Subcarrier Allocation Method

부반송파 할당방식에 따른 OFDM 시스템의 성능 분석

  • Choi, Seung-Kuk (Department of Infor. & Commun. Engineering, Incheon University)
  • Received : 2013.10.21
  • Accepted : 2013.12.06
  • Published : 2014.02.28
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Abstract

OFDM technique uses multiple sub-carriers for the data transmission. Therefore, inter carrier interference is generated because of nonlinear high power amplifier and carrier frequency offset. Wireless OFDM transmission over Doppler fading channels also causes inter carrier interference. The interference increases the bit error rate in receiver. Sub-carrier allocation methods in LTE and WiMAX standards are different. The performance of OFDM systems using different sub-carrier allocation, gauged by the bit error rate, is analyzed considering the nonlinear high power amplifier, carrier frequency offset and Doppler fading channels.

OFDM 전송방식에서는 여러 개의 부반송파를 사용하여 데이터를 전송한다. 그러므로 송신 비선형 전력증폭기와 반송파 주파수편차에 의하여 부반송파 간 간섭이 발생된다. 또한 OFDM 신호가 도플러 시변 페이딩 채널을 통하여 전송될 때 부반송파 간 간섭이 발생된다. 이러한 부반송파 간섭으로 인하여 수신기에서 비트 오류율이 증가된다. LTE와 WiMAX 표준방식에서는 서로 다른 부반송파 할당방식이 사용되고 있다. 그러므로 본 논문에서는 비선형 전력증폭기, 반송파 주파수편차의 영향을 고려하여, 송신 신호가 다중경로 도플러 페이딩 채널을 통하여 전송될 때, 부반송파 할당방식에 따른 OFDM 시스템의 데이터 비트 오류율 성능을 분석한다.

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References

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