United States Patent 7,545,851
Pan , et al. June 9, 2009
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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.
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Inventors: Pan; Jung-Lin (Selden, NY), Huang; Yuejin (Holbrook, NY), Grieco; Donald M. (Manhassett, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 12/135,577
Filed: June 9, 2008
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
11455999 Jun., 2008 7386033
11138816 Jul., 2006 7079570
10753631 Aug., 2005 6937644
60439284 Jan., 2003
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Current U.S. Class: 375/147 ; 375/260
Current International Class: H04B 1/707 (20060101); H04K 1/10 (20060101)
Field of Search: 375/141-144,147,148,150,152,260,262,343,346 370/208,210,320,335,342
