Tuesday, February 17, 2009 8:59:10 AM
Kim , et al. February 17, 2009
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Method and apparatus employed in a user equipment for interference signal code power and noise variance estimation
Abstract
Method and apparatus employed by a UE for interference signal code power noise variance estimation employing a reduced number of samples utilizing the equation.sigma..times..function. ##EQU00001## where.gamma..function. ##EQU00002## where N.sub.sample=L.sub.chest-N.sub.plK.sub.max, where.gamma..function..function. ##EQU00003## and where ##EQU00004## As an alternative, a recursive technique may be employed wherein the noise variance is estimated from the ignored coefficients of the estimated channel output and upgraded recursively as per the following:.sigma..times..times..times. ##EQU00005## where h.sub.i.sup.(j) are the channel estimates after the post processing and the noise variance estimates {circumflex over (.sigma.)}.sub.n-1.sup.2, and the initial values of h.sub.i.sup.(j) are all zeros.
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Inventors: Kim; Younglok (Seoul, KR), Pan; Jung-Lin (Selden, NY), Zeira; Ariela (Huntington, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 10/901,796
Filed: July 29, 2004
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
10171285 Jun., 2002 6816470
60322927 Sep., 2001
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Current U.S. Class: 370/342 ; 370/281; 370/294; 375/346; 455/296
Current International Class: H04J 3/00 (20060101)
Field of Search: 370/280,281,342,294 375/346,147
Gamco
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