Semi-hard interference cancellation for uncoded DS-CDMA systems

C Kasparis; RJ Piechocki; AR Nix; PN Fletcher

doi:10.1109/VETECF.2004.1404757

Semi-hard interference cancellation for uncoded DS-CDMA systems

C Kasparis, RJ Piechocki, AR Nix, PN Fletcher

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Abstract

A new iterative technique for suppressing multiuser interference in uncoded DS-CDMA systems is proposed. In the new approach semi-hard decisions are taken at the output of the linear MMSE detector. This involves taking hard decisions only for symbols which satisfy a reliability criterion, while the rest are left unaltered in their soft form. The semi-hard estimate is subsequently used for parallel interference cancellation, which is then followed by additional linear MMSE filtering. This procedure is repeated a small number of times. Simulation results show that the proposed detector is capable of approaching closely the single-user performance in a fully loaded multiuser scenario and this is achieved within 5 to 10 iterations. In the same system scenario the new technique outperforms the probabilistic data association (PDA) algorithm, which is considered as a state-of-the art solution. The computational complexity of the proposed detector is of the same order as of a standard linear detector.

Translated title of the contribution	Semi-hard interference cancellation for uncoded DS-CDMA systems
Original language	English
Title of host publication	Vehicular Technology Conference 2004 (VTC 2004-Fall)
Publisher	Institute of Electrical and Electronics Engineers (IEEE)
Pages	3708 - 3712
Number of pages	5
Volume	5
ISBN (Print)	10903038
DOIs	https://doi.org/10.1109/VETECF.2004.1404757
Publication status	Published - Sept 2004
Event	60th Vehicular Technology Conference 2004 (VTC 2004-Fall) - Los Angeles, United States Duration: 28 Sept 2004 → 29 Sept 2004

Conference

Conference	60th Vehicular Technology Conference 2004 (VTC 2004-Fall)
Country/Territory	United States
City	Los Angeles
Period	28/09/04 → 29/09/04

Bibliographical note

Conference Proceedings/Title of Journal: IEEE 60th Vehicular Technology Conference, 2004 (VTC 2004-Fall)
Rose publication type: Conference contribution

Terms of use: Copyright © 2004 IEEE. Reprinted from Proceedings of IEEE Vehicular Technology Conference, Fall-2004. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to [email protected].

By choosing to view this document, you agree to all provisions of the copyright laws protecting it.

Keywords

code division multiple access
interference suppression

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10.1109/VETECF.2004.1404757

Kasparis IEEE VTC fall2004Accepted author manuscript, 2.08 MB

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title = "Semi-hard interference cancellation for uncoded DS-CDMA systems",

abstract = "A new iterative technique for suppressing multiuser interference in uncoded DS-CDMA systems is proposed. In the new approach semi-hard decisions are taken at the output of the linear MMSE detector. This involves taking hard decisions only for symbols which satisfy a reliability criterion, while the rest are left unaltered in their soft form. The semi-hard estimate is subsequently used for parallel interference cancellation, which is then followed by additional linear MMSE filtering. This procedure is repeated a small number of times. Simulation results show that the proposed detector is capable of approaching closely the single-user performance in a fully loaded multiuser scenario and this is achieved within 5 to 10 iterations. In the same system scenario the new technique outperforms the probabilistic data association (PDA) algorithm, which is considered as a state-of-the art solution. The computational complexity of the proposed detector is of the same order as of a standard linear detector.",

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author = "C Kasparis and RJ Piechocki and AR Nix and PN Fletcher",

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Kasparis, C, Piechocki, RJ, Nix, AR & Fletcher, PN 2004, Semi-hard interference cancellation for uncoded DS-CDMA systems. in Vehicular Technology Conference 2004 (VTC 2004-Fall). vol. 5, Institute of Electrical and Electronics Engineers (IEEE), pp. 3708 - 3712, 60th Vehicular Technology Conference 2004 (VTC 2004-Fall), Los Angeles, United States, 28/09/04. https://doi.org/10.1109/VETECF.2004.1404757

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N1 - Conference Proceedings/Title of Journal: IEEE 60th Vehicular Technology Conference, 2004 (VTC 2004-Fall) Rose publication type: Conference contribution Terms of use: Copyright © 2004 IEEE. Reprinted from Proceedings of IEEE Vehicular Technology Conference, Fall-2004. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to [email protected]. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.

PY - 2004/9

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N2 - A new iterative technique for suppressing multiuser interference in uncoded DS-CDMA systems is proposed. In the new approach semi-hard decisions are taken at the output of the linear MMSE detector. This involves taking hard decisions only for symbols which satisfy a reliability criterion, while the rest are left unaltered in their soft form. The semi-hard estimate is subsequently used for parallel interference cancellation, which is then followed by additional linear MMSE filtering. This procedure is repeated a small number of times. Simulation results show that the proposed detector is capable of approaching closely the single-user performance in a fully loaded multiuser scenario and this is achieved within 5 to 10 iterations. In the same system scenario the new technique outperforms the probabilistic data association (PDA) algorithm, which is considered as a state-of-the art solution. The computational complexity of the proposed detector is of the same order as of a standard linear detector.

AB - A new iterative technique for suppressing multiuser interference in uncoded DS-CDMA systems is proposed. In the new approach semi-hard decisions are taken at the output of the linear MMSE detector. This involves taking hard decisions only for symbols which satisfy a reliability criterion, while the rest are left unaltered in their soft form. The semi-hard estimate is subsequently used for parallel interference cancellation, which is then followed by additional linear MMSE filtering. This procedure is repeated a small number of times. Simulation results show that the proposed detector is capable of approaching closely the single-user performance in a fully loaded multiuser scenario and this is achieved within 5 to 10 iterations. In the same system scenario the new technique outperforms the probabilistic data association (PDA) algorithm, which is considered as a state-of-the art solution. The computational complexity of the proposed detector is of the same order as of a standard linear detector.

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KW - interference suppression

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BT - Vehicular Technology Conference 2004 (VTC 2004-Fall)

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T2 - 60th Vehicular Technology Conference 2004 (VTC 2004-Fall)

Y2 - 28 September 2004 through 29 September 2004

ER -

Semi-hard interference cancellation for uncoded DS-CDMA systems

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