Interference-reducing spreading code design for BS-CDMA with quasi-synchronous reception

Yue Wang, Justin P. Coon

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

2 Citations (Scopus)


Using mutually shift orthogonal spreading codes, block spread code division multiple access (BS-CDMA) systems have been shown to achieve multiuser interference (MUI) free reception when signals of all the users arrive at the base station synchronously. In practice, imperfect synchronization destroys the orthogonality among users and causes MUI. We present in this paper the design of spreading and despreading codes to reduce the MUI due to quasi-synchronous reception. A quasi-synchronous BS-CDMA system using the proposed spreading and despreading codes is shown to achieve a performance close to that of a synchronous system, while maintaining a low receiver complexity. The cost is reduced bandwidth efficiency in transmission, which becomes less significant as the number of users increases.

Original languageEnglish
Title of host publicationIEEE 72nd Vehicular Technology Conference, 2010. VTC 2010-Fall. 2010
Place of PublicationNEW YORK
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages5
ISBN (Print)978-1-4244-3574-6
Publication statusPublished - Sept 2010
EventIEEE 72nd Vehicular Technology Conference Fall 2010 - Ottawa, Canada
Duration: 6 Sept 20109 Sept 2010


ConferenceIEEE 72nd Vehicular Technology Conference Fall 2010


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