A novel interference rejection scheme for DS-CDMA using adaptive noise cancellation

SSH Wijayasuriya; GH Norton; PG Turner; JP McGeehan

doi:10.1109/ICCS.1994.474229

A novel interference rejection scheme for DS-CDMA using adaptive noise cancellation

SSH Wijayasuriya, GH Norton, PG Turner, JP McGeehan

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Abstract

This paper proposes a novel solution to the interference cancellation problem in mobile direct sequence code division multiple access (DS-CDMA) systems. Conventional adaptive interference cancellation techniques rely on a training sequence to update the taps of an adaptive filter or decision feedback equaliser (DFE). The strategy proposed in this paper replaces this conventional optimal filtering approach by one based on the principles of adaptive noise cancellation (ANC). As opposed to the conventional optimal filtering approach, the ANC approach exploits the cyclo-stationary properties of the multiple access interference, in order to model the interference generation process. Silent periods (c.f. voice activity factor) can be exploited to derive the interference model. This removes the need for a training sequence and associated system overheads. The scheme employs a conjugate matched filter (CMF) to generate an interference reference input to the adaptive noise canceller. A preliminary investigation of the performance of the proposed scheme is undertaken. The ANC scheme is shown to have a significantly better performance than the conventional receiver and the DFE in the multiple access interference limited environment. It is shown that the scheme can be extended to provide blind interference cancellation in the case of acute near-far conditions.

Translated title of the contribution	A novel interference rejection scheme for DS-CDMA using adaptive noise cancellation
Original language	English
Title of host publication	ICCS, Singapore, Nov
Publisher	Institute of Electrical and Electronics Engineers (IEEE)
Pages	364 - 368
Volume	2
ISBN (Print)	0780320468
DOIs	https://doi.org/10.1109/ICCS.1994.474229
Publication status	Published - Nov 1994
Event	International Conference on Computational Science (ISSC '94) - Singapore, Singapore Duration: 1 Nov 1994 → …

Conference

Conference	International Conference on Computational Science (ISSC '94)
Country/Territory	Singapore
City	Singapore
Period	1/11/94 → …

Bibliographical note

Rose publication type: Conference contribution

Terms of use: Copyright © 1994 IEEE. Reprinted from Proceedings of Singapore ICCS '94 Conference. 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 pubs-permissions@ieee.org.

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

Keywords

DS-CDMA
Rayleigh channels

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10.1109/ICCS.1994.474229

Wijayasuriya IEEE ICCS Nov1994Accepted author manuscript, 382 KB

http://hdl.handle.net/1983/263

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title = "A novel interference rejection scheme for DS-CDMA using adaptive noise cancellation",

abstract = "This paper proposes a novel solution to the interference cancellation problem in mobile direct sequence code division multiple access (DS-CDMA) systems. Conventional adaptive interference cancellation techniques rely on a training sequence to update the taps of an adaptive filter or decision feedback equaliser (DFE). The strategy proposed in this paper replaces this conventional optimal filtering approach by one based on the principles of adaptive noise cancellation (ANC). As opposed to the conventional optimal filtering approach, the ANC approach exploits the cyclo-stationary properties of the multiple access interference, in order to model the interference generation process. Silent periods (c.f. voice activity factor) can be exploited to derive the interference model. This removes the need for a training sequence and associated system overheads. The scheme employs a conjugate matched filter (CMF) to generate an interference reference input to the adaptive noise canceller. A preliminary investigation of the performance of the proposed scheme is undertaken. The ANC scheme is shown to have a significantly better performance than the conventional receiver and the DFE in the multiple access interference limited environment. It is shown that the scheme can be extended to provide blind interference cancellation in the case of acute near-far conditions.",

keywords = "DS-CDMA, Rayleigh channels",

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note = "Rose publication type: Conference contribution Terms of use: Copyright {\textcopyright} 1994 IEEE. Reprinted from Proceedings of Singapore ICCS '94 Conference. 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 pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it. ; International Conference on Computational Science (ISSC '94) ; Conference date: 01-11-1994",

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Wijayasuriya, SSH, Norton, GH, Turner, PG & McGeehan, JP 1994, A novel interference rejection scheme for DS-CDMA using adaptive noise cancellation. in ICCS, Singapore, Nov. vol. 2, Institute of Electrical and Electronics Engineers (IEEE), pp. 364 - 368, International Conference on Computational Science (ISSC '94), Singapore, Singapore, 1/11/94. https://doi.org/10.1109/ICCS.1994.474229

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AU - Norton, GH

AU - Turner, PG

AU - McGeehan, JP

N1 - Rose publication type: Conference contribution Terms of use: Copyright © 1994 IEEE. Reprinted from Proceedings of Singapore ICCS '94 Conference. 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 pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.

PY - 1994/11

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N2 - This paper proposes a novel solution to the interference cancellation problem in mobile direct sequence code division multiple access (DS-CDMA) systems. Conventional adaptive interference cancellation techniques rely on a training sequence to update the taps of an adaptive filter or decision feedback equaliser (DFE). The strategy proposed in this paper replaces this conventional optimal filtering approach by one based on the principles of adaptive noise cancellation (ANC). As opposed to the conventional optimal filtering approach, the ANC approach exploits the cyclo-stationary properties of the multiple access interference, in order to model the interference generation process. Silent periods (c.f. voice activity factor) can be exploited to derive the interference model. This removes the need for a training sequence and associated system overheads. The scheme employs a conjugate matched filter (CMF) to generate an interference reference input to the adaptive noise canceller. A preliminary investigation of the performance of the proposed scheme is undertaken. The ANC scheme is shown to have a significantly better performance than the conventional receiver and the DFE in the multiple access interference limited environment. It is shown that the scheme can be extended to provide blind interference cancellation in the case of acute near-far conditions.

AB - This paper proposes a novel solution to the interference cancellation problem in mobile direct sequence code division multiple access (DS-CDMA) systems. Conventional adaptive interference cancellation techniques rely on a training sequence to update the taps of an adaptive filter or decision feedback equaliser (DFE). The strategy proposed in this paper replaces this conventional optimal filtering approach by one based on the principles of adaptive noise cancellation (ANC). As opposed to the conventional optimal filtering approach, the ANC approach exploits the cyclo-stationary properties of the multiple access interference, in order to model the interference generation process. Silent periods (c.f. voice activity factor) can be exploited to derive the interference model. This removes the need for a training sequence and associated system overheads. The scheme employs a conjugate matched filter (CMF) to generate an interference reference input to the adaptive noise canceller. A preliminary investigation of the performance of the proposed scheme is undertaken. The ANC scheme is shown to have a significantly better performance than the conventional receiver and the DFE in the multiple access interference limited environment. It is shown that the scheme can be extended to provide blind interference cancellation in the case of acute near-far conditions.

KW - DS-CDMA

KW - Rayleigh channels

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M3 - Conference Contribution (Conference Proceeding)

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SP - 364

EP - 368

BT - ICCS, Singapore, Nov

PB - Institute of Electrical and Electronics Engineers (IEEE)

T2 - International Conference on Computational Science (ISSC '94)

Y2 - 1 November 1994

ER -

A novel interference rejection scheme for DS-CDMA using adaptive noise cancellation

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