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 contribution||Orthogonal Re-spread for Uplink WCDMA Beamforming|
|Title of host publication||IEEE Vehicular Technology Conference, Tokyo|
|Publisher||Institute of Electrical and Electronics Engineers (IEEE)|
|Pages||1373 - 1376|
|Number of pages||4|
|Publication status||Published - May 2000|
|Event||51st Vehicular Technology Conference 2000 (VTC 2000-Spring) - Tokyo, Japan|
Duration: 1 May 2000 → …
|Conference||51st Vehicular Technology Conference 2000 (VTC 2000-Spring)|
|Period||1/05/00 → …|
Bibliographical noteRose 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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