Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2004-07-14
2009-12-15
Fan, Chieh M (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S253000, C375S346000
Reexamination Certificate
active
07634013
ABSTRACT:
Each burst of an OFDM signal which is transmitted, for example, on the basis of the IEEE 802.11a/g WLAN Standard contains a preamble with a sequence of ten short training signals. The DC offset is derived from the mean value of the signal over a measurement section of the training signal sequence, with a first subsection of the measurement section in time being weighted with a rising weighting function, and a last subsection of the measurement section in time being weighted with a falling weighting function. A central subsection, which is not weighted, may be located between the two. The signal is accumulated in this way over the measurement section, and the result is divided by the sum of the weights of the subsections. Using this procedure, the averaging process has better filter characteristics than the noise contribution from the actual signal.
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Dicke Billig & Czaja, PLLC
Fan Chieh M
Ghulamali Qutbuddin
Infineon - Technologies AG
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