The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 28, 2008
Filed:
Dec. 21, 2004
Hoang Nguyen, Davis, CA (US);
Jianzhong Zhang, Irving, TX (US);
Yuanbin Guo, Richardson, TX (US);
Dennis Mccain, Lewisville, TX (US);
Joe Dowling, Aughnacliffe, IE;
Hoang Nguyen, Davis, CA (US);
Jianzhong Zhang, Irving, TX (US);
Yuanbin Guo, Richardson, TX (US);
Dennis McCain, Lewisville, TX (US);
Joe Dowling, Aughnacliffe, IE;
Nokia Corporation, Espoo, FI;
Abstract
Receiving downlink CDMA signals in a fast-fading environment is facilitated at higher receiver velocities by updating the block-adaptive linear minimum mean square error (LMMSE) downlink CDMA equalizer. The autocorrelation matrix of the observed data is updated by passing block-wise autocorrelation slides through a filter. Each autocorrelation slide is an autocorrelation matrix estimated from a short block of observed data over which the channel can be considered constant. This method achieves a reliable estimate for the autocorrelation matrix when the block size must be small to ensure that the block-wise stationarity assumption holds in cases of fast fading channels. In addition, small block sizes make it possible to satisfy the equalizer delay constraint imposed by hardware and certain voice transmission standards such as CDMA2000 1X where demodulated data must be delivered within only several symbol periods of the signal arrival time.