Multi-stage turbo equalization for MIMO systems with hybrid ARQ

Sangjoon Park, Sooyong Choi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A multi-stage turbo equalization scheme based on the bit-level combining (BLC) is proposed for multiple-input multipleoutput (MIMO) systems with hybrid automatic repeat request (HARQ). In the proposed multi-stage turbo equalization scheme, the minimum mean-square-error equalizer at each iteration calculates the extrinsic log-likelihood ratios for the transmitted bits in a subpacket and the subpackets are sequentially replaced at each iteration according to the HARQ rounds of received subpackets. Therefore, a number of iterations are executed for different subpackets received at several HARQ rounds, and the transmitted bits received at the previous HARQ rounds as well as the current HARQ round can be estimated from the combined information up to the current HARQ round. In addition, the proposed multi-stage turbo equalization scheme has the same computational complexity as the conventional bit-level combining based turbo equalization scheme. Simulation results show that the proposed multi-stage turbo equalization scheme outperforms the conventional BLC based turbo equalization scheme for MIMO systems with HARQ.

Original languageEnglish
Article number7575800
Pages (from-to)333-339
Number of pages7
JournalJournal of Communications and Networks
Volume18
Issue number3
DOIs
Publication statusPublished - 2016 Jun 1

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Equalizers
Mean square error
Computational complexity

All Science Journal Classification (ASJC) codes

  • Information Systems
  • Computer Networks and Communications

Cite this

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title = "Multi-stage turbo equalization for MIMO systems with hybrid ARQ",
abstract = "A multi-stage turbo equalization scheme based on the bit-level combining (BLC) is proposed for multiple-input multipleoutput (MIMO) systems with hybrid automatic repeat request (HARQ). In the proposed multi-stage turbo equalization scheme, the minimum mean-square-error equalizer at each iteration calculates the extrinsic log-likelihood ratios for the transmitted bits in a subpacket and the subpackets are sequentially replaced at each iteration according to the HARQ rounds of received subpackets. Therefore, a number of iterations are executed for different subpackets received at several HARQ rounds, and the transmitted bits received at the previous HARQ rounds as well as the current HARQ round can be estimated from the combined information up to the current HARQ round. In addition, the proposed multi-stage turbo equalization scheme has the same computational complexity as the conventional bit-level combining based turbo equalization scheme. Simulation results show that the proposed multi-stage turbo equalization scheme outperforms the conventional BLC based turbo equalization scheme for MIMO systems with HARQ.",
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Multi-stage turbo equalization for MIMO systems with hybrid ARQ. / Park, Sangjoon; Choi, Sooyong.

In: Journal of Communications and Networks, Vol. 18, No. 3, 7575800, 01.06.2016, p. 333-339.

Research output: Contribution to journalArticle

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