Pulse or digital communications – Transmitters – Quadrature amplitude modulation
Reexamination Certificate
2006-01-31
2006-01-31
Deppe, Betsy L. (Department: 2637)
Pulse or digital communications
Transmitters
Quadrature amplitude modulation
C375S261000, C375S302000
Reexamination Certificate
active
06993092
ABSTRACT:
Frame configuration determination section101judges a communication situation based on the transmission path information indicating the level of fluctuations of the transmission path due to fading and data transmission speed information indicating the transmission speed of the transmission data based on the level of the reception signal and determines the interval of inserting a known pilot symbol and the modulation system of a transmission digital signal. Quadrature baseband modulation section102modulates the transmission digital signal to a quadrature baseband signal according to the modulation system indicated from frame configuration determination section101. Pilot symbol generation section103generates a pilot symbol known between the transmitting and receiving sides. Frame configuration section104inserts the known pilot symbol output from pilot symbol generation section103at the insertion interval instructed from frame configuration determination section101to configure a frame. This makes it possible to flexibly improve the data transmission efficiency and the quality of data at the same time.
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Matsuoka Akihiko
Murakami Yutaka
Orihashi Masayuki
Takabayashi Shinichiro
Deppe Betsy L.
Greenblum & Bernstein P.L.C.
Matsushita Electric - Industrial Co., Ltd.
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