Efficient multichannel filtering for CDMA modems
US6907024B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 25, 2002 |
| Grant date | Jun 14, 2005 |
| Priority date | — |
| Expiry date | Nov 25, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2201/70707
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.