United States Patent 7,974,365
Pietraski July 5, 2011
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Method and apparatus for computing SIR of time varying signals in a wireless communication system
Abstract
A method and apparatus for correcting symbols of a common pilot channel (CPICH) to generate an accurate signal-to-interference ratio (SIR) estimate in a wireless communication system are disclosed. In one embodiment, a non-stationary mean of a group of the CPICH symbols is estimated, the CPICH symbols are delayed, and the CPICH symbols are corrected by dividing the delayed CPICH symbols by the estimated non-stationary mean of the group of CPICH symbols. In another embodiment, a signal power estimate is generated based on the magnitude of CPICH symbols, a noise power estimate is generated by subtracting the signal power estimate from a total power estimate based on the magnitude of the CPICH symbols, and a SIR estimate is generated for symbols that have undergone a time varying gain by dividing the signal power estimate by the noise power estimate.
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Inventors: Pietraski; Philip J. (Huntington Station, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 12/535,018
Filed: August 4, 2009
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
12191533 Aug., 2008 7590192
11302819 Sep., 2008 7421045
60663321 Mar., 2005
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Current U.S. Class: 375/316 ; 375/345
Current International Class: H03K 9/00 (20060101); H04L 27/00 (20060101)
Field of Search: 375/316,345
PPP
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