Frequency auto-correction apparatus for CDMA multipath...

Details Frequency auto-correction apparatus for CDMA multipath... Frequency auto-correction apparatus for CDMA multipath...

2006-08-22

2006-08-22

Milord, Marceau (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S164200, C455S182200, C455S260000, C455S205000, C455S065000, C455S067160, C455S067130, C375S344000, C375S148000, C375S147000, C375S149000, C375S371000, C375S347000, C375S349000, C370S342000, C370S441000, C370S335000

Reexamination Certificate

active

07095993

ABSTRACT:
An automatic frequency correction (AFC) apparatus used for CDMA multipath fading channels comprises a frequency-offset evaluator, an automatic frequency correction loop filter and a carrier frequency adjuster. The present invention provides a “multipath energy window” designing method for the non-determinacy of multipath signals in mobile communication environment. Frequency-offset information can be extracted from the multipath energy window by a simple calculation and evaluated by a maximal SNR weight process. This invention also provides a step-variable accumulation adjusting method and greatly improves the response speed of the AFC apparatus as compared with a conventional loop filter, whereby supplies better AFC required for CDMA mobile terminals.

REFERENCES:
patent: 5691974 (1997-11-01), Zehavi et al.
patent: 6058101 (2000-05-01), Huang et al.
patent: 6269075 (2001-07-01), Tran
patent: 6289061 (2001-09-01), Kandala et al.
patent: 6466606 (2002-10-01), Jou
patent: 6590945 (2003-07-01), Brardjanian et al.
patent: 6625197 (2003-09-01), Lundby et al.
patent: 6728301 (2004-04-01), Chrisikos
patent: 6731911 (2004-05-01), Hirata et al.
patent: 6956895 (2005-10-01), Vihriala
patent: 1147321 (2000-05-01), None
patent: 1254994 (2000-05-01), None
patent: WO 9622661 (1996-06-01), None
patent: WO 0048346 (2000-08-01), None
International Search Report of Jul. 18, 2002, ISA/CN.

Affiliated with

Also associated with

Rating

Frequency auto-correction apparatus for CDMA multipath... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Frequency auto-correction apparatus for CDMA multipath..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency auto-correction apparatus for CDMA multipath... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3712227