Carrier frequency estimation via symbol rate estimation

Details Carrier frequency estimation via symbol rate estimation Carrier frequency estimation via symbol rate estimation

2006-05-03

2009-12-29

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S140000, C375S147000, C375S148000, C375S149000, C375S316000, C370S203000, C370S320000, C370S335000

Reexamination Certificate

active

07639731

ABSTRACT:
A receiver for carrier frequency estimation via symbol rate estimation in the presence of carrier frequency error for use in signal acquisition and signal demodulation of spread-spectrum chips affected by Doppler shift in an advanced tactical data link. Received LPD signals with a very low signal-to-noise ratio are input to a receiver designed to tolerate carrier frequency error caused by Doppler shift. Extremely low signal-to-noise ratio and short dwell times due to spread spectrum modulation and frequency-hopping make direct estimation of carrier frequency impractical. A method and apparatus is disclosed to use the error is symbol rate, the nominal carrier frequency, and the nominal transmitted symbol rate to estimate carrier frequency error. This enables longer coherent integration times and improves LPD receiver performance.

REFERENCES:
patent: 6661834 (2003-12-01), Shan et al.
patent: 7133440 (2006-11-01), Horne et al.
patent: 7151790 (2006-12-01), Patenaude et al.
patent: 7496080 (2009-02-01), Mower et al.
patent: 2002/0154681 (2002-10-01), Kontola
patent: 2003/0231704 (2003-12-01), Tanaka et al.
patent: 2005/0254560 (2005-11-01), Huang
patent: 2006/0103573 (2006-05-01), Geier et al.
patent: 2007/0183485 (2007-08-01), Leimer
patent: 2008/0008082 (2008-01-01), Ma et al.
Wavelets and Wideband Correlation Processing; Lora G. Weiss; IEEE Signal Processing Magazine; Jan. 1994; p. 13-32.

Affiliated with

Also associated with

Rating

Carrier frequency estimation via symbol rate estimation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Carrier frequency estimation via symbol rate estimation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Carrier frequency estimation via symbol rate estimation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4078424