Reducing Detection Complexity of MIMO-OFDM by Using New Nulling Vectors

Ming LEI; Hiroshi HARADA

doi:10.1093/ietcom/e90-b.2.392

Reducing Detection Complexity of MIMO-OFDM by Using New Nulling Vectors

Ming LEI, Hiroshi HARADA

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We propose new nulling vectors for the subcarrier grouping based low-complexity detection scheme of V-BLAST (vertical Bell Laboratories layered space-time) coded MIMO-OFDM. In each subcarrier group, the center subcarrier uses the conventional ZF-DFE (zero-forcing decision-feedback- equalization) algorithm and the non-center subcarriers use the reduced-complexity ZF-DFE with the new nulling vectors. The subcarrier grouping based detection scheme, ZF-DFE-SG, can significantly reduce the detection complexity compared with ZF-DFE-EX which exhaustively applies the conventional ZF-DFE at each subcarrier independently. The performance loss is very small. We conduct the simulations for channel coded V-BLAST OFDM system under estimated channel frequency responses. It is shown the complexity can be reduced by 80.6% with only 1.0 dB performance loss for a 44 system.

Publication: IEICE TRANSACTIONS on Communications Vol.E90-B No.2 pp.392-396

Publication Date: 2007/02/01

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Online ISSN: 1745-1345

DOI: 10.1093/ietcom/e90-b.2.392

Type of Manuscript: LETTER

Category: Wireless Communication Technologies

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Ming LEI, Hiroshi HARADA, "Reducing Detection Complexity of MIMO-OFDM by Using New Nulling Vectors" in IEICE TRANSACTIONS on Communications, vol. E90-B, no. 2, pp. 392-396, February 2007, doi: 10.1093/ietcom/e90-b.2.392.
Abstract: We propose new nulling vectors for the subcarrier grouping based low-complexity detection scheme of V-BLAST (vertical Bell Laboratories layered space-time) coded MIMO-OFDM. In each subcarrier group, the center subcarrier uses the conventional ZF-DFE (zero-forcing decision-feedback- equalization) algorithm and the non-center subcarriers use the reduced-complexity ZF-DFE with the new nulling vectors. The subcarrier grouping based detection scheme, ZF-DFE-SG, can significantly reduce the detection complexity compared with ZF-DFE-EX which exhaustively applies the conventional ZF-DFE at each subcarrier independently. The performance loss is very small. We conduct the simulations for channel coded V-BLAST OFDM system under estimated channel frequency responses. It is shown the complexity can be reduced by 80.6% with only 1.0 dB performance loss for a 44 system.
URL: https://global.ieice.org/en_transactions/communications/10.1093/ietcom/e90-b.2.392/_p

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@ARTICLE{e90-b_2_392,
author={Ming LEI, Hiroshi HARADA, },
journal={IEICE TRANSACTIONS on Communications},
title={Reducing Detection Complexity of MIMO-OFDM by Using New Nulling Vectors},
year={2007},
volume={E90-B},
number={2},
pages={392-396},
abstract={We propose new nulling vectors for the subcarrier grouping based low-complexity detection scheme of V-BLAST (vertical Bell Laboratories layered space-time) coded MIMO-OFDM. In each subcarrier group, the center subcarrier uses the conventional ZF-DFE (zero-forcing decision-feedback- equalization) algorithm and the non-center subcarriers use the reduced-complexity ZF-DFE with the new nulling vectors. The subcarrier grouping based detection scheme, ZF-DFE-SG, can significantly reduce the detection complexity compared with ZF-DFE-EX which exhaustively applies the conventional ZF-DFE at each subcarrier independently. The performance loss is very small. We conduct the simulations for channel coded V-BLAST OFDM system under estimated channel frequency responses. It is shown the complexity can be reduced by 80.6% with only 1.0 dB performance loss for a 44 system.},
keywords={},
doi={10.1093/ietcom/e90-b.2.392},
ISSN={1745-1345},
month={February},}

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TY - JOUR
TI - Reducing Detection Complexity of MIMO-OFDM by Using New Nulling Vectors
T2 - IEICE TRANSACTIONS on Communications
SP - 392
EP - 396
AU - Ming LEI
AU - Hiroshi HARADA
PY - 2007
DO - 10.1093/ietcom/e90-b.2.392
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E90-B
IS - 2
JA - IEICE TRANSACTIONS on Communications
Y1 - February 2007
AB - We propose new nulling vectors for the subcarrier grouping based low-complexity detection scheme of V-BLAST (vertical Bell Laboratories layered space-time) coded MIMO-OFDM. In each subcarrier group, the center subcarrier uses the conventional ZF-DFE (zero-forcing decision-feedback- equalization) algorithm and the non-center subcarriers use the reduced-complexity ZF-DFE with the new nulling vectors. The subcarrier grouping based detection scheme, ZF-DFE-SG, can significantly reduce the detection complexity compared with ZF-DFE-EX which exhaustively applies the conventional ZF-DFE at each subcarrier independently. The performance loss is very small. We conduct the simulations for channel coded V-BLAST OFDM system under estimated channel frequency responses. It is shown the complexity can be reduced by 80.6% with only 1.0 dB performance loss for a 44 system.
ER -