Low-density parity-check (LDPC) coded MIMO systems with iterative turbo decoding

Hisashi Futaki, Tomoaki Ohtsuki

Research output: Contribution to journalConference articlepeer-review

11 Citations (Scopus)


Transmit diversity schemes have been studied for high spectral-efficiency and high bit-rate transmission, such as multi-input multi-output (MIMO) systems. In the MIMO systems, forward error correction coding is essential for high quality communications. Recently, low-density parity-check (LDPC) codes have attracted much attention as good error correcting codes like turbo codes. LDPC codes have been applied to the MIMO systems, where we refer to the system as the MIMO-LDPC. In this paper, we propose a new MIMO-LDPC system with iterative turbo decoding (MIMO-LDPC-TD) using two LDPC encoders and two LDPC decoders to improve the performance of the MIMO-LDPC. Since each decoder in the MIMO-LDPC-TD is smaller than that in the MIMO-LDPC, the decoding complexity at each decoder in the MIMO-LDPC-TD is less than that in the MIMO-LDPC. We also compare the performance of the MIMO-LDPC with that of the turbo coded MIMO systems (MIMO-turbo) on flat Rayleigh fading channels. We show that the MIMO-LDPC-TD can achieve the good error rate performance with reduced decoding complexity at each decoder on a flat Rayleigh fading channel, particularly on a slow fading channel. We also show that the MIMO-LDPC can achieve the better error rate performance than the MIMO-turbo on a fast Rayleigh fading channel.

Original languageEnglish
Pages (from-to)342-346
Number of pages5
JournalIEEE Vehicular Technology Conference
Issue number1
Publication statusPublished - 2003 Dec 1
Externally publishedYes
Event2003 IEEE 58th Vehicular Technology Conference, VTC2003-Fall - Orlando, FL, United States
Duration: 2003 Oct 62003 Oct 9

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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