The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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A New Techniques for Estimation of Carrier Frequency Offset in MIMO OFDM Systems

다중 입출력 직교 주파수 분할 다중화 시스템에서의 반송파 주파수 오프셋 추정을 위한 새로운 기법

  • Altaha, Mustafa (Dept. of Information and Communication Engineering, Myongji University) ;
  • Hwang, Humor (Dept. of Information and Communication Engineering, Myongji University)
  • Received : 2017.01.12
  • Accepted : 2017.05.16
  • Published : 2017.06.01
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Abstract

Multiple input, multiple output orthogonal frequency division multiplexing (MIMO OFDM) systems are the candidate for the future wireless communications. However, the main drawback of MIMO OFDM systems is their sensitivity to carrier frequency offset (CFO) similar to the single input, single output OFDM (SISO OFDM) systems. The demodulation of a signal with CFO causes large bit error rate and degrade the performance of a symbol synchronizer. It is important to estimate the frequency offset and minimize or eliminate its impact. In this paper, we propose a technique based on observation training symbols for estimating CFO by employing block-by-block estimation for SISO OFDM systems. The technique of SISO OFDM is extended to the MIMO OFDM systems. Simulation results show that the proposed techniques have a superior performance and better accuracy compared to the conventional techniques in the sense of mean square error.

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References

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