Method and apparatus for improving transmit antenna weight tracking using channel correlations in a wireless communication system
US7236538B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 22, 2002 |
| Grant date | Jun 26, 2007 |
| Priority date | — |
| Expiry date | Dec 12, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/0854
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A novel method and apparatus for improving transmit antenna weight tracking using channel vector element to element correlations in a wireless communication system is disclosed. The present channel autocorrelation tracking technique utilizes the observation that tracking can be improved when a channel gain vector contains correlated elements. In a first embodiment of the autocorrelation tracking technique, the present invention extracts a coarse gradient estimate by utilizing a perturbation vector autocorrelation matrix estimate and a perturbation autocorrelation matrix to update TxAA weight vectors accordingly. In a second embodiment of the channel autocorrelation tracking technique, the present invention extracts a coarse gradient estimate by utilizing eigendecompositions, perturbation vector autocorrelation matrix estimates, and perturbation autocorrelation matrices to update TxAA weight vectors accordingly. In a third embodiment of the channel autocorrelation tracking technique, the present invention reduces the phase change that can occur at receivers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.