Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-11-14
2010-11-09
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S343000, C375S355000
Reexamination Certificate
active
07830953
ABSTRACT:
The present invention conducts the initial synchronization acquisition of the rapid and high precision ultra-wideband signal without complicatedness of hardware and increase in power consumption. For this purpose, a communication apparatus for exchanging information with an intermittent pulse train signal searches all phases among the pulses in the predetermined search resolution in the process to acquire initial synchronization of the input pulse, estimates the region where the peak phase of the largest output value exists, narrows the region where the peak phase exists up to the predetermined range by repeating the search for all phases in the estimated region in the next step, and conducts acquisition of detailed synchronization in the estimated region. In every step, the threshold value for judging existence of signal or a gain in the analog circuit is controlled for each step. Moreover, the search resolution is set coarse for estimation of the peak phase and set fine for acquisition of detailed synchronization.
REFERENCES:
patent: 6967993 (2005-11-01), Miller
patent: 2002/0172262 (2002-11-01), Sugaya et al.
patent: 2005/0018750 (2005-01-01), Foerster et al.
patent: 2006/0008035 (2006-01-01), Larsson
patent: 2002-335189 (2002-11-01), None
patent: 2002-335228 (2002-11-01), None
M. Win, “Impulse Radio: How It Works,” IEEE Communications Letters, vol. 2, No. 2, Feb. 1998, pp. 36-38.
R. Fujiwara et al, “Rapid Signal Acquisition for Low-Rate Carrier-Based Ultra-Wideband Impulse Radio,” ISCAS205 Proc., May 2005, pp. 4497-4500.
Fujiwara Ryosuke
Miyazaki Masayuki
Nakagawa Tatsuo
Huang David
Liu Shuwang
Miles & Stockbridge P.C.
Renesas Electronics Corporation
LandOfFree
Receiving apparatus, communication apparatus and control... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Receiving apparatus, communication apparatus and control..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Receiving apparatus, communication apparatus and control... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4247525