United States Patent 7,796,678
Pan , et al. September 14, 2010
Communication system with receivers employing generalized two-stage data estimation
Abstract
A wireless transmit/receive unit (WTRU) is configure to receive and sample wireless signals in a shared spectrum where the wireless signal comprise encoded symbols. The WTRU has a channel estimation device configured to process received signal samples to produce an estimate of a channel response of the received signals corresponding to a matrix H. The channel estimation device is preferably configured to process the received signal samples to produce an estimate of noise variance of the received signals. The WTRU preferably has a two stage data estimator that includes a channel equalizer and a despreader. The channel equalizer is configured to process received signal samples using the estimated channel response matrix H and the estimate of noise variance to produce a spread signal estimate of the received signals. The despreader is configured to process the spread signal estimate of the received signals produced by said channel equalizer to recover encoded symbols of the received signals.
Inventors: Pan; Kyle Jung-Lin (Smithtown, NY), Huang; Yuejin (Holbrook, NY), Grieco; Donald M. (Manhassett, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 12/468,354
Filed: May 19, 2009
Related U.S. Patent Documents
Application Number Filing Date Patent Number Issue Date
12135577 Jun., 2008 7545851
11455999 Jun., 2006 7386033
11138816 May., 2005 7079570
10753631 Jan., 2004 6937644
60439284 Jan., 2003
Current U.S. Class: 375/147 ; 375/260
Current International Class: H04B 1/707 (20060101); H04K 1/10 (20060101)
Field of Search: 375/141-144,147,148,150,152,260,262,265,343,346 370/208,210,320,335,342
