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Power Optimization of Tilted Tomlinson-Harashima Precoder in MIMO Channels with Imperfect Channel State Information

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  • Hossein Khaleghi Bizaki
  • Morteza Khaleghi Hojaghan
  • Seyyed Mohammad Razavizadeh

Abstract

This paper concentrates on the designing of a robust Tomlinson-Harashima Precoder (THP) over multiple-input multiple-output (MIMO) channels in wireless communication systems with assumption of imperfect channel state information (CSI) at the transmitter side. With the assumption that the covariance matrix of channel estimation error is available at the transmitter side, we design a THP that presents robustness against channel uncertainties. In the proposed robust THP, the transmit power is further minimized by using the Tilted constellation concept. This power minimization reduces the interchannel Interference (ICI) between subchannels and, furthermore, recovers some part of the THP's power loss. The bit error rate (BER) of the proposed system is further improved by using a power loading technique. Finally, the simulation results compare the performance of our proposed robust THP with a conventional MIMO-THP.

Suggested Citation

  • Hossein Khaleghi Bizaki & Morteza Khaleghi Hojaghan & Seyyed Mohammad Razavizadeh, 2013. "Power Optimization of Tilted Tomlinson-Harashima Precoder in MIMO Channels with Imperfect Channel State Information," Journal of Optimization, Hindawi, vol. 2013, pages 1-6, May.
    • Handle: RePEc:hin:jjopti:636529
    DOI: 10.1155/2013/636529
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