Orthogonality of UMTS codes in indoor channels

JL Webber, MA Beach, MR Hunukumbure, CN Canagarajah

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


UMTS (Universal Mobile Telecommunications System) spreading codes are only truly orthogonal in the absence of multipath delay and time offsets. In all practical channels the loss of orthogonality will result in the generation of non-zero cross-correlation products that can compromise the error performance of code division multiple access (CDMA) systems. The practical level of cross-correlation produced in the uplink of multiuser applications at the base-station site and the effect of this interference on the RAKE receiver is investigated by means of wideband dual polar channel measurements from a field trials campaign, taken within the UMTS time division duplex (TDD) uplink (1910-1915 MHz). The results showed that 75% of the measurements in an indoor channel had normalised correlations less than 0.25
Translated title of the contributionOrthogonality of UMTS codes in indoor channels
Original languageEnglish
Title of host publicationThird International Conference on 3G Mobile Communication Technologies
PublisherInstitution of Engineering and Technology (IET)
Pages151 - 155
ISBN (Print)0852967497
Publication statusPublished - May 2002
Event3rd International Conference on 3G Mobile Communication Technologies - London, United Kingdom
Duration: 1 May 2002 → …


Conference3rd International Conference on 3G Mobile Communication Technologies
CountryUnited Kingdom
Period1/05/02 → …

Bibliographical note

Rose publication type: Conference contribution

Sponsorship: Julian Webber wishes to thank the EPSRC amd Toshiba TREL, Bristol for their student CASE award. The authors wish to thank the HEFCE for their support in the procurement of the Medav system and Allgon, Sweden for their loan of the antenna array

Other identifier: IEE Conf. Publ. No. 489


  • 3G mobile communication
  • UHF radio propagation
  • codes
  • correlation methods

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