Improving the direction-of-arrival resolution via double code filtering in WCDMA

CN Canagarajah, JP McGeehan, RJ Piechocki

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

7 Citations (Scopus)


This paper presents a new method for improving the azimuthal resolution at the base station of the WCDMA system employing antenna array. The method uses two covariance matrices resulting from double code filtering. The first matrix is extracted by the traditional de-spreading and results in noisy signal estimate. The other matrix is extracted by an orthogonal re-spread method. The orthogonal re-spread (OR) is a new extraction method for the spatial correlation matrix of interference and noise only. The method uses one of the remaining orthogonal variable spreading factor code (OVSF) that is orthogonal to all traffic and control channels to spread energy form the desired user while attempting to maintain the same level of multiple access interference. In the presented method information obtained from OR correlation matrix is used to suppress interference and improve the signal resolution via the whitening (Mahalanobis) transform. Since the proposed method operates as additional transform on the sample covariance matrix, it can be used in conjunction with all DoA estimation methods
Translated title of the contributionImproving the Direction-Of-Arrival Resolution Via Double Code Filtering In WCDMA
Original languageEnglish
Title of host publicationFirst International Conference on 3G Mobile Communications Technologies, London
PublisherInstitution of Engineering and Technology (IET)
Pages204 - 207
ISBN (Print)0852967268
Publication statusPublished - Mar 2000
Event1st International Conference on 3G Mobile Communication Technologies - London, United Kingdom
Duration: 1 Mar 2000 → …


Conference1st International Conference on 3G Mobile Communication Technologies
CountryUnited Kingdom
Period1/03/00 → …

Bibliographical note

Rose publication type: Conference contribution

Sponsorship: The authors would like to acknowledge Fujitsu Europe Telecom R&D Centre Ltd for providing financial support for the work presented in this paper

Other identifier: IEE Conf. Publ. No. 471


  • code division multiple access

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