T-spaced equalization for 1xEV systems

Details T-spaced equalization for 1xEV systems T-spaced equalization for 1xEV systems

2005-02-15

2005-02-15

Vo, Don N. (Department: 2631)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S144000, C375S148000, C375S152000

Reexamination Certificate

active

06856646

ABSTRACT:
The present invention relates to systems and methods that facilitate compensating for intersymbol interference (e.g. due to non-nyquist filtering) in Code Division Multiple Access (CDMA) systems (e.g., IS 95 and IS2000 systems). The subject invention employs equalization filters (e.g., T-spaced equalizers) at fingers of a RAKE receiver. By effecting such equalization filtering at a downstream point in a receiving system, e.g., at the fingers of the RAKE receiver, the filters can be run so as to operate at lower rates as compared to conventional systems where filtering is effected upstream where time is not necessarily known thus requiring equalization filters to operate at significantly faster rates (e.g., 2× or 4× expected chip rate). Accordingly, as compared to conventional systems where the matching filters often are of substantial complexity (e.g., >80 taps) the present invention provides for less complex equalization filters thereby reducing overall system complexity and cost.

REFERENCES:
patent: 5729526 (1998-03-01), Yoshida
patent: 6339612 (2002-01-01), Stewart et al.
patent: 6545990 (2003-04-01), Amalfitano et al.
patent: 6570918 (2003-05-01), Rademacher
patent: 20020018485 (2002-02-01), Hondo
patent: 20030053524 (2003-03-01), Dent
patent: 20030058929 (2003-03-01), Cox et al.

Affiliated with

Also associated with

Rating

T-spaced equalization for 1xEV systems does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with T-spaced equalization for 1xEV systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and T-spaced equalization for 1xEV systems will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3514055