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Pilot Symbol Aided Channel Estimation for Spatial Modulation-OFDM Systems and its Performance Analysis with Different Types of Interpolations

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Abstract

Spatial modulation orthogonal frequency division multiplexing (SM-OFDM) system has been recently proposed as an alternative for multiple-input multiple-output (MIMO)-OFDM systems to increase spectral efficiency by keeping a low-complexity implementation. In the literature, SM-OFDM systems assume a perfect channel state information (P-CSI) available at the receiver for coherent detection and the channel estimation problem is not considered. It is clear that the channel estimation is a critical issue on the performance of SM-OFDM systems. In this paper, a frame structure where pilot symbols are typically interspersed with data symbols among the sub-carriers to aid the channel estimation is considered. Then the pilot symbol aided channel estimation (PSA-CE) technique with different interpolations is proposed for the SM-OFDM systems. It is shown that in the proposed PSA-CE, equidistantly spaced pilot symbols allow to reconstruct the channel response by means of interpolation if the spacing of the pilots is sufficiently close to satisfy the sampling theorem. Linear, nearest neighbor, piecewise cubic Hermite and the low-pass interpolations are investigated to explore trade-off between complexity and performances. We show that the low pass interpolator yields better performance than the other interpolation techniques for selected cases such as higher order modulations. The results validate the potential of the proposed PSA-CE estimation applying to SM-OFDM systems.

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Authors and Affiliations

  1. Department of Electronics Engineering, Istanbul Kültür University, 34156, Bakirkoy, Istanbul, Turkey

    Yusuf Acar

  2. Department of Electrical and Electronics Engineering, Istanbul University, 34320, Avcilar, Istanbul, Turkey

    Hakan Doğan

  3. Department of Electrical and Electronics Engineering, Kadir Has University, 34083, Cibali, Istanbul, Turkey

    Erdal Panayirci

Authors
  1. Yusuf Acar
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  2. Hakan Doğan
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  3. Erdal Panayirci
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Corresponding author

Correspondence to Yusuf Acar.

Additional information

This work is supported in part by the Turkish Scientific and Technical Research Institute(TUBITAK) under Grant 114E011.

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Acar, Y., Doğan, H. & Panayirci, E. Pilot Symbol Aided Channel Estimation for Spatial Modulation-OFDM Systems and its Performance Analysis with Different Types of Interpolations. Wireless Pers Commun 94, 1387–1404 (2017). https://doi.org/10.1007/s11277-016-3687-9

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  • DOI: https://doi.org/10.1007/s11277-016-3687-9

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