Pulse or digital communications – Spread spectrum – Chirp
Reexamination Certificate
2006-02-08
2010-11-23
Tran, Khai (Department: 2611)
Pulse or digital communications
Spread spectrum
Chirp
C375S150000
Reexamination Certificate
active
07839914
ABSTRACT:
Disclosed is a method and an apparatus for channel estimation regarding electromagnetic wave multi-path characteristics between a sender and a receiver by using a chirp signal. The method includes the steps of (a) multiplying a received composite signal by a narrowband chirp-shift-keying signal or narrowband multiple center-frequency-chirp signal generated by the receiver itself and outputting a sum of individual frequency components resulting from difference in distance of multiple paths for up-chirp and down-chirp signal portions of a chirp-shift-keying signal, respectively, the received composite signal being formed by generating narrowband chirp-shift-keying signals or narrowband multiple center-frequency-chirp signals by the sender, sending the signals by a transmission antenna, receiving the signals by a reception antenna of the receiver via a multi-path channel, superimposing the signals, and adding the signals; (b) multiplying outputs of the up-chirp and down-chirp signal portions of the sum of individual frequency components and calculating a tolerance frequency output; (c) compensating for a frequency tolerance of the sum of individual frequency components by using the tolerance frequency output and generating a frequency compensation output; (d) compensating for discontinuity of chirp-shift-keying signals resulting from use of the narrowband chirp-shift-keying signals or the narrowband multiple center-frequency-chirp signals regarding the frequency compensation output and generating a discontinuity compensation output having no discontinuity; (e) decomposing the discontinuity compensation output into individual multi-path signals by using a frequency analysis method; and (f) extracting an attenuation component and a time delay component caused by the multi-path channel from the individual multi-path signals by using a size of frequency components of each frequency.
REFERENCES:
patent: 5748670 (1998-05-01), Zastrow
patent: 6252882 (2001-06-01), Matsui et al.
patent: 6498822 (2002-12-01), Tanaka et al.
patent: 6683904 (2004-01-01), Linder et al.
patent: 7110432 (2006-09-01), Hooton
patent: 7130361 (2006-10-01), Enderlein et al.
International Search Report for Application No. PCT/KR2006/000453, dated May 18, 2006.
Lahive & Cockfield LLP
Lee, Esq. EuiHoon
Orthotron Co., Ltd.
Tran Khai
LandOfFree
Method and apparatus for channel estimation to... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for channel estimation to..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for channel estimation to... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4241228