Single-carrier multi-user MIMO downlink with time-domain tomlinson-harashima precoding

Shohei Yoshioka, Shinya Kumagai, Fumiyuki Adachi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Nonlinear precoding improves the downlink bit error rate (BER) performance of multi-user multiple-input multiple-output (MUMIMO). Broadband single-carrier (SC) block transmission can improve the capability that nonlinear precoding reduces BER, as it provides frequency diversity gain. This paper considers Tomlinson-Harashima precoding (THP) as a nonlinear precoding scheme for SC-MU-MIMO downlink. In the SC-MU-MIMO downlink with frequency-domain THP proposed by Degen and Rruhl (called SC-FDTHP), the inter-symbol interference (ISI) is suppressed by transmit frequency-domain equalization (FDE) after suppressing the inter-user interference (IUI) by frequency-domain THP. Transmit FDE increases the signal variance, hence transmission performance improvement is limited. In this paper, we propose a new SC-MU-MIMO downlink with time-domain THP which can pre-remove both ISI and IUI (called SC-TDTHP) if perfect channel state information (CSI) is available. Modulo operation in THP suppresses the signal variance increase caused by ISI and IUI pre-removal, and hence the transmission quality improves. For further performance improvement, vector perturbation is introduced to SC-TDTHP (called SC-TDTHP w/VP). Computer simulation shows that SC-TDTHP achieves better BER performance than SC-FDTHP and that SC-TDTHP w/VP offers further improvement in BER performance over SC-MU-MIMO with VP (called SC-VP). Computational complexity is also compared and it is showed that SC-TDTHP and SC-TDTHP w/VP incur higher computational complexity than SC-FDTHP but lower than SC-VP.

Original languageEnglish
Pages (from-to)471-480
Number of pages10
JournalIEICE Transactions on Communications
Issue number2
Publication statusPublished - 2016 Feb


  • Single-carrier downlink
  • Time-domain
  • Tomlinson-Harashima precoding
  • Vector perturbation


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