Orthogonal re-spread for uplink WCDMA beamforming

RJ Piechocki, CN Canagarajah, JP McGeehan, G Tsoulos

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

2 Citations (Scopus)
320 Downloads (Pure)


This paper presents a new extraction method for the spatial correlation matrix of interference and noise only based on orthogonal re-spreading. The method uses one of the remaining orthogonal variable spreading factor (OVSF) code that is orthogonal to all traffic and control channels to spread energy form the desired user while attempting to maintain the same level of co-channel interference. De-spreading with the assigned OVSF codes that is performed in parallel provides the usual noisy correlation matrix. With those two matrices at hand optimal beamforming using maximal signal-to-interference ratio (MSIR) criterion is readily performed. Although the matrix extracted by the orthogonal re-spread is not a statistically consistent estimate, remarkable potentials in practical situations are demonstrated.
Translated title of the contributionOrthogonal Re-spread for Uplink WCDMA Beamforming
Original languageEnglish
Title of host publicationIEEE Vehicular Technology Conference, Tokyo
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages1373 - 1376
Number of pages4
ISBN (Print)0780357183
Publication statusPublished - May 2000
Event51st Vehicular Technology Conference 2000 (VTC 2000-Spring) - Tokyo, Japan
Duration: 1 May 2000 → …


Conference51st Vehicular Technology Conference 2000 (VTC 2000-Spring)
Period1/05/00 → …

Bibliographical note

Rose publication type: Conference contribution

Sponsorship: The authors wish to thank Fujitsu Europe Telecom R&D Centre Ltd. for sponsoring the work presented in this paper.

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