Linear equalizers for quasi-synchronous block spreading CDMA systems

MZ Bocus, Wang Yue, JP Coon

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

3 Citations (Scopus)
454 Downloads (Pure)


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 contributionLinear equalizers for quasi-synchronous block spreading CDMA systems
Original languageEnglish
Title of host publicationIEEE Global Telecommunications Conference, 2009 (GLOBECOM 2009), Honolulu
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages1 - 6
Number of pages6
ISBN (Print)9781424441488
Publication statusPublished - Nov 2009
EventGlobal Telecommunications Conference, 2009 - Honolulu, HI, United States
Duration: 1 Nov 2009 → …


ConferenceGlobal Telecommunications Conference, 2009
Abbreviated titleGLOBECOM 2009
Country/TerritoryUnited States
CityHonolulu, HI
Period1/11/09 → …

Bibliographical note

Rose publication type: Conference contribution

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  • CDMA
  • block spreading


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