Efficient multichannel filtering for CDMA modems

Details Efficient multichannel filtering for CDMA modems Efficient multichannel filtering for CDMA modems

2005-06-14

2005-06-14

Pham, Chi (Department: 2663)

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

C708S319000

Reexamination Certificate

active

06907024

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.

REFERENCES:
patent: 4425665 (1984-01-01), Stauffer
patent: 4709343 (1987-11-01), Van Cang
patent: 4811262 (1989-03-01), White
patent: 4862402 (1989-08-01), Shah et al.
patent: 5117385 (1992-05-01), Gee
patent: 5140613 (1992-08-01), Birgenheier et al.
patent: 5222035 (1993-06-01), Nakase et al.
patent: 5258940 (1993-11-01), Coker et al.
patent: 5262974 (1993-11-01), Hausman et al.
patent: 5287299 (1994-02-01), Lin
patent: 5305349 (1994-04-01), Dent
patent: 5311459 (1994-05-01), D'Luna et al.
patent: 5343335 (1994-08-01), Hara
patent: 5379242 (1995-01-01), Rose et al.
patent: 5414732 (1995-05-01), Kaufmann
patent: 5483549 (1996-01-01), Weinberg et al.
patent: 5487089 (1996-01-01), Misaizu et al.
patent: 5596570 (1997-01-01), Soliman
patent: 0372350 (1990-05-01), None
patent: 0372359 (1990-06-01), None
patent: 62256516 (1987-11-01), None
patent: H2287874 (1990-11-01), None
patent: H4222111 (1992-08-01), None
patent: H4287593 (1992-10-01), None
patent: H5144128 (1993-06-01), None
patent: H6104694 (1994-04-01), None
patent: H7273600 (1995-10-01), None
patent: 9200639 (1992-01-01), None
Designing Digits Into Audio Equalisation; Electronics World And Wireless World; vol. 97, No. 1669; Dec. 1991; pp. 998-999, 1001-1003 and 1022-1023; See entire document.

Affiliated with

Also associated with

Rating

Efficient multichannel filtering for CDMA modems does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Efficient multichannel filtering for CDMA modems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Efficient multichannel filtering for CDMA modems will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3495518