Partial interference subspace rejection in CDMA systems

Henrik Hansen; Sofiene Affes; Paul Mewelstein

doi:10.1109/VETECS.2001.945006

Partial interference subspace rejection in CDMA systems

Henrik Hansen, Sofiene Affes, Paul Mewelstein

Institut national de la recherche scientifique

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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Abstract

Previously presented interference subspace rejection (ISR) proposed a family of new efficient multiuser detectors for CDMA. We reconsider in this paper the modes of ISR using decision feedback (DF). DF modes share similarities with parallel interference cancellation (PIC) but attempt to cancel interference by nulling rather than subtraction. However like the PIC they are prone to wrong tentative decisions. We propose a modification to DF modes that performs partial ISR instead of complete interference cancellation. When tentative decisions are correct, interference is therefore not perfectly rejected anymore. This drawback is compensated by improved robustness to wrong tentative decisions. We show that in hard handoff systems, partial ISR can only provide negligible performance improvements in high loaded systems outside the region of interest due to out-sector interference. In situations where both in-sector and out-sector interferences are cancelled, as may occur in soft handoff situations, BER performance may improve by more than I dB

Original language	English
Title of host publication	Proceedings on IEEE 53rd Vehicular Technology Conference
Volume	3
Publication date	2001
Pages	1809-1813
ISBN (Print)	0-7803-6728-6
DOIs	https://doi.org/10.1109/VETECS.2001.945006
Publication status	Published - 2001
Event	IEEE VTS 53rd Vehicular Technology Conference - , Greece Duration: 6 May 2001 → 9 May 2001 Conference number: 53 http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=7588

Conference

Conference	IEEE VTS 53rd Vehicular Technology Conference
Number	53
Country/Territory	Greece
Period	06/05/2001 → 09/05/2001
Internet address	http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=7588

Bibliographical note

Copyright: 2000 IEEE. 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 to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

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title = "Partial interference subspace rejection in CDMA systems",

abstract = "Previously presented interference subspace rejection (ISR) proposed a family of new efficient multiuser detectors for CDMA. We reconsider in this paper the modes of ISR using decision feedback (DF). DF modes share similarities with parallel interference cancellation (PIC) but attempt to cancel interference by nulling rather than subtraction. However like the PIC they are prone to wrong tentative decisions. We propose a modification to DF modes that performs partial ISR instead of complete interference cancellation. When tentative decisions are correct, interference is therefore not perfectly rejected anymore. This drawback is compensated by improved robustness to wrong tentative decisions. We show that in hard handoff systems, partial ISR can only provide negligible performance improvements in high loaded systems outside the region of interest due to out-sector interference. In situations where both in-sector and out-sector interferences are cancelled, as may occur in soft handoff situations, BER performance may improve by more than I dB",

author = "Henrik Hansen and Sofiene Affes and Paul Mewelstein",

note = "Copyright: 2000 IEEE. 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 to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE; IEEE VTS 53rd Vehicular Technology Conference, VTC 2001 Spring ; Conference date: 06-05-2001 Through 09-05-2001",

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AU - Hansen, Henrik

AU - Affes, Sofiene

AU - Mewelstein, Paul

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N2 - Previously presented interference subspace rejection (ISR) proposed a family of new efficient multiuser detectors for CDMA. We reconsider in this paper the modes of ISR using decision feedback (DF). DF modes share similarities with parallel interference cancellation (PIC) but attempt to cancel interference by nulling rather than subtraction. However like the PIC they are prone to wrong tentative decisions. We propose a modification to DF modes that performs partial ISR instead of complete interference cancellation. When tentative decisions are correct, interference is therefore not perfectly rejected anymore. This drawback is compensated by improved robustness to wrong tentative decisions. We show that in hard handoff systems, partial ISR can only provide negligible performance improvements in high loaded systems outside the region of interest due to out-sector interference. In situations where both in-sector and out-sector interferences are cancelled, as may occur in soft handoff situations, BER performance may improve by more than I dB

AB - Previously presented interference subspace rejection (ISR) proposed a family of new efficient multiuser detectors for CDMA. We reconsider in this paper the modes of ISR using decision feedback (DF). DF modes share similarities with parallel interference cancellation (PIC) but attempt to cancel interference by nulling rather than subtraction. However like the PIC they are prone to wrong tentative decisions. We propose a modification to DF modes that performs partial ISR instead of complete interference cancellation. When tentative decisions are correct, interference is therefore not perfectly rejected anymore. This drawback is compensated by improved robustness to wrong tentative decisions. We show that in hard handoff systems, partial ISR can only provide negligible performance improvements in high loaded systems outside the region of interest due to out-sector interference. In situations where both in-sector and out-sector interferences are cancelled, as may occur in soft handoff situations, BER performance may improve by more than I dB

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M3 - Article in proceedings

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EP - 1813

BT - Proceedings on IEEE 53rd Vehicular Technology Conference

T2 - IEEE VTS 53rd Vehicular Technology Conference

Y2 - 6 May 2001 through 9 May 2001

ER -

Partial interference subspace rejection in CDMA systems

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