Abstract
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 contribution | Orthogonality of UMTS codes in indoor channels |
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Original language | English |
Title of host publication | Third International Conference on 3G Mobile Communication Technologies |
Publisher | Institution of Engineering and Technology (IET) |
Pages | 151 - 155 |
ISBN (Print) | 0852967497 |
DOIs | |
Publication status | Published - May 2002 |
Event | 3rd International Conference on 3G Mobile Communication Technologies - London, United Kingdom Duration: 1 May 2002 → … |
Conference
Conference | 3rd International Conference on 3G Mobile Communication Technologies |
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Country/Territory | United Kingdom |
City | London |
Period | 1/05/02 → … |
Bibliographical note
Rose publication type: Conference contributionSponsorship: 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
Keywords
- 3G mobile communication
- UHF radio propagation
- codes
- correlation methods