Journal of Communications and Networks

  • 제16권4호
  • /
  • Pages.447-457
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  • 2014
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  • 1229-2370(pISSN)
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  • 1976-5541(eISSN)
한국통신학회 (The Korean Institute of Commucations and Information Sciences)
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Frequency Domain Channel Estimation for MIMO SC-FDMA Systems with CDM Pilots

  • Kim, Hyun-Myung (Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Kim, Dongsik (Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Kim, Tae-Kyoung (Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Im, Gi-Hong (Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH))
  • 투고 : 2013.12.03
  • 심사 : 2014.05.27
  • 발행 : 2014.08.30
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초록

In this paper, we investigate the frequency domain channel estimation for multiple-input multiple-output (MIMO) single-carrier frequency-division multiple-access (SC-FDMA) systems. In MIMO SC-FDMA, code-division multiplexed (CDM) pilots such as cyclic-shifted Zadoff-Chu sequences have been adopted for channel estimation. However, most frequency domain channel estimation schemes were developed based on frequency-division multiplexing of pilots. We first develop a channel estimation error model by using CDM pilots, and then analyze the mean-square error (MSE) of various minimum MSE (MMSE) frequency domain channel estimation techniques. We show that the cascaded one-dimensional robust MMSE (C1D-RMMSE) technique is complexity-efficient, but it suffers from performance degradation due to the channel correlation mismatch when compared to the two-dimensional MMSE (2D-MMSE) technique. To improve the performance of C1D-RMMSE, we design a robust iterative channel estimation (RITCE) with a frequency replacement (FR) algorithm. After deriving the MSE of iterative channel estimation, we optimize the FR algorithm in terms of the MSE. Then, a low-complexity adaptation method is proposed for practical MIMO SC-FDMA systems, wherein FR is performed according to the reliability of the data estimates. Simulation results show that the proposed RITCE technique effectively improves the performance of C1D-RMMSE, thus providing a better performance-complexity tradeoff than 2D-MMSE.

키워드

과제정보

연구 과제 주관 기관 : National Research Foundation of Korea (NRF)

참고문헌

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