Pre-DFT processing for MIMO-OFDM systems with space-time-frequency coding

Shaohua Li, Defeng Huang, Khaled Letaief, Zucheng Zhou

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Subcarrier based space processing was conventionally employed in Orthogonal Frequency Division Multiplexing (OFDM) systems under Multiple-Input and Multiple-Output (MIMO) channels to achieve optimal performance. At the receiver of such systems, multiple Discrete Fourier Transform (DFT) blocks, each corresponding to one receive antenna, are required to be used. This induces considerable complexity. In this paper, we propose a pre-DFT processing scheme for the receiver of MIMO-OFDM systems with space-time-frequency coding. With the proposed scheme, the number of DFT blocks at the receiver can be any number from one to the number of receive antennas, thus enabling effective complexity and performance tradeoff. Using the pre-DFT processing scheme, the number of input signals to the space-time-frequency decoder can be reduced compared with the subcarrier based space processing. Therefore, a high dimensional MIMO system can be shrunk into an equivalently low dimension one. Due to the dimension reduction, both the complexity of the decoder and the complexity of channel estimation can be reduced. In general, the weighting coefficients calculation for the pre-DFT processing scheme should be relevant to the specific space-time-frequency code employed. In this paper, we propose a simple universal weighting coefficients calculation algorithm that can be used to achieve excellent performance for most practical space-time-frequency coding schemes. This makes the design of the pre-DFT processing scheme independent of the optimization of the space-time-frequency coding, which is desirable for multiplatform systems.

Original languageEnglish
Pages (from-to)4176-4182
Number of pages7
JournalIEEE Transactions on Wireless Communications
Volume6
Issue number11
DOIs
Publication statusPublished - Nov 2007
Externally publishedYes

Fingerprint

Discrete Fourier transform
Orthogonal Frequency Division multiplexing (OFDM)
Discrete Fourier transforms
Orthogonal frequency division multiplexing
Coding
Space-time
Output
Processing
Receiver
Weighting
Antenna
Antennas
Channel Estimation
Dimension Reduction
Coefficient
Channel estimation
One Dimension
High-dimensional
Trade-offs
Optimization

Keywords

  • Multiple-input and multiple-output (MIMO)
  • Orthogonal frequency division multiplexing (OFDM)
  • Spacetime-frequency code

ASJC Scopus subject areas

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

Cite this

Pre-DFT processing for MIMO-OFDM systems with space-time-frequency coding. / Li, Shaohua; Huang, Defeng; Letaief, Khaled; Zhou, Zucheng.

In: IEEE Transactions on Wireless Communications, Vol. 6, No. 11, 11.2007, p. 4176-4182.

Research output: Contribution to journalArticle

Li, Shaohua ; Huang, Defeng ; Letaief, Khaled ; Zhou, Zucheng. / Pre-DFT processing for MIMO-OFDM systems with space-time-frequency coding. In: IEEE Transactions on Wireless Communications. 2007 ; Vol. 6, No. 11. pp. 4176-4182.
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