United States Patent 7,631,027
Regis December 8, 2009
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Efficient multichannel filtering for CDMA modems
Abstract
An efficient, multichannel filter for CDMA modems permits multiple serial, digital bit streams to be filtered by digital signal processing techniques including sample weighting and summing functions. Each individual channel may have custom weighting coefficients or weighting coefficients common for all channels. If the weighting coefficients are by adaption, the same approach may be taken. The multichannel FIR filter is implemented with no multipliers and a reduction in the number of adders. To increase the speed of operation, the filter structure utilizes look-up tables storing the weighting coefficients. The invention can be embodied as either as a field programmable gate array or an application specific integrated circuit. The use of look-up tables saves significant chip resources.
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Inventors: Regis; Robert T. (Huntington, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 11/141,622
Filed: May 31, 2005
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
10304308 Nov., 2002 6907024
08670160 Jun., 1996 6487190
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Current U.S. Class: 708/319 ; 370/342
Current International Class: G06F 17/10 (20060101); H04B 7/216 (20060101)
Field of Search: 708/308,316,319 370/342
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