Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Reexamination Certificate
2006-05-09
2006-05-09
Orgad, Edan (Department: 2684)
Telecommunications
Transmitter and receiver at separate stations
Having measuring, testing, or monitoring of system or part
C455S115100, C455S504000, C375S346000, C375S224000, C375S344000
Reexamination Certificate
active
07043207
ABSTRACT:
The invention relates to a fading frequency estimating apparatus that performs a predetermined signal processing on a radio frequency signal that arrives through a radio transmission channel, to estimate a frequency of fading occurring on the radio transmission channel. An object of the present invention is to quickly and accurately estimate a fading frequency without need to use a very complicated structure. The fading frequency estimating apparatus includes a frequency analyzing section obtaining at two instances a frequency spectrum of a sequence of differences in instantaneous values of envelop of signals that chronologically arrive through the radio transmission channel, the two instances apart from each other with an interval necessary for a characteristic of the radio transmission channel to be steady, and it includes an estimating section estimating a frequency of fading to be such a frequency that the magnitude of the frequency spectrum is to be maximum.
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May 1998 IEEE vol. 46, No. 5, pp. 686-694: “Optimal Decision Strategies for Acquistion of Spread-Spectrum Signals in Frequency- Selective Fading Channels.” by Roland R. Rick et al.
International Search Report dated Apr. 30, 2003.
Katten Muchin & Rosenman LLP
Orgad Edan
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