Linear equalizers for quasi-synchronous block spreading CDMA systems

MZ Bocus; Wang Yue; JP Coon

doi:10.1109/GLOCOM.2009.5425825

Linear equalizers for quasi-synchronous block spreading CDMA systems

MZ Bocus
, Wang Yue
, JP Coon

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

3 Citations (Scopus)

607 Downloads (Pure)

Abstract

Recently, a block spreading code division multiple access (BS-CDMA) technique was presented whereby user-specific preceding along with orthogonal spreading codes are used to achieve multi-user interference (MUI) free when all users arrive at the base station simultaneously. In practice however, imperfect synchronization destroys the orthogonality among users and MUI occurs. This paper investigates the design of linear frequency domain equalizers to reduce the MUI in a quasi-synchronous BS-CDMA system. An optimal frequency domain linear minimum-mean squared error (LMMSE) equalizer is derived. Further simplification leads to a novel sub-optimal equalizer with reduced computational complexity. It is shown through simulation that the proposed equalizers effectively suppress the error floor due to quasi-synchronous reception when channel coding is applied.

Translated title of the contribution	Linear equalizers for quasi-synchronous block spreading CDMA systems
Original language	English
Title of host publication	IEEE Global Telecommunications Conference, 2009 (GLOBECOM 2009), Honolulu
Publisher	Institute of Electrical and Electronics Engineers (IEEE)
Pages	1 - 6
Number of pages	6
ISBN (Print)	9781424441488
DOIs	https://doi.org/10.1109/GLOCOM.2009.5425825
Publication status	Published - Nov 2009
Event	Global Telecommunications Conference, 2009 - Honolulu, HI, United States Duration: 1 Nov 2009 → …

Conference

Conference	Global Telecommunications Conference, 2009
Abbreviated title	GLOBECOM 2009
Country/Territory	United States
City	Honolulu, HI
Period	1/11/09 → …

Bibliographical note

Rose publication type: Conference contribution

Terms of use: Copyright © 2009 IEEE. Reprinted from IEEE
Global Telecommunications Conference 2009 (GLOBECOM 2009).

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

CDMA
block spreading

Access to Document

10.1109/GLOCOM.2009.5425825

conference paperAccepted author manuscript, 193 KB
poster to accompany conference paperAccepted author manuscript, 903 KB

http://hdl.handle.net/1983/1678

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Cite this

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title = "Linear equalizers for quasi-synchronous block spreading CDMA systems",

abstract = "Recently, a block spreading code division multiple access (BS-CDMA) technique was presented whereby user-specific preceding along with orthogonal spreading codes are used to achieve multi-user interference (MUI) free when all users arrive at the base station simultaneously. In practice however, imperfect synchronization destroys the orthogonality among users and MUI occurs. This paper investigates the design of linear frequency domain equalizers to reduce the MUI in a quasi-synchronous BS-CDMA system. An optimal frequency domain linear minimum-mean squared error (LMMSE) equalizer is derived. Further simplification leads to a novel sub-optimal equalizer with reduced computational complexity. It is shown through simulation that the proposed equalizers effectively suppress the error floor due to quasi-synchronous reception when channel coding is applied.",

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author = "MZ Bocus and Wang Yue and JP Coon",

note = "Rose publication type: Conference contribution Terms of use: Copyright {\textcopyright} 2009 IEEE. Reprinted from IEEE Global Telecommunications Conference 2009 (GLOBECOM 2009). 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. ; Global Telecommunications Conference, 2009, GLOBECOM 2009 ; Conference date: 01-11-2009",

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Bocus, MZ, Yue, W & Coon, JP 2009, Linear equalizers for quasi-synchronous block spreading CDMA systems. in IEEE Global Telecommunications Conference, 2009 (GLOBECOM 2009), Honolulu. Institute of Electrical and Electronics Engineers (IEEE), pp. 1 - 6, Global Telecommunications Conference, 2009, Honolulu, HI, United States, 1/11/09. https://doi.org/10.1109/GLOCOM.2009.5425825

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PY - 2009/11

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N2 - Recently, a block spreading code division multiple access (BS-CDMA) technique was presented whereby user-specific preceding along with orthogonal spreading codes are used to achieve multi-user interference (MUI) free when all users arrive at the base station simultaneously. In practice however, imperfect synchronization destroys the orthogonality among users and MUI occurs. This paper investigates the design of linear frequency domain equalizers to reduce the MUI in a quasi-synchronous BS-CDMA system. An optimal frequency domain linear minimum-mean squared error (LMMSE) equalizer is derived. Further simplification leads to a novel sub-optimal equalizer with reduced computational complexity. It is shown through simulation that the proposed equalizers effectively suppress the error floor due to quasi-synchronous reception when channel coding is applied.

AB - Recently, a block spreading code division multiple access (BS-CDMA) technique was presented whereby user-specific preceding along with orthogonal spreading codes are used to achieve multi-user interference (MUI) free when all users arrive at the base station simultaneously. In practice however, imperfect synchronization destroys the orthogonality among users and MUI occurs. This paper investigates the design of linear frequency domain equalizers to reduce the MUI in a quasi-synchronous BS-CDMA system. An optimal frequency domain linear minimum-mean squared error (LMMSE) equalizer is derived. Further simplification leads to a novel sub-optimal equalizer with reduced computational complexity. It is shown through simulation that the proposed equalizers effectively suppress the error floor due to quasi-synchronous reception when channel coding is applied.

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ER -

Linear equalizers for quasi-synchronous block spreading CDMA systems

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