Pulse or digital communications – Transmitters – Quadrature amplitude modulation
Reexamination Certificate
2007-12-13
2009-06-09
Deppe, Betsy L (Department: 2611)
Pulse or digital communications
Transmitters
Quadrature amplitude modulation
C375S261000, C375S295000, C375S302000
Reexamination Certificate
active
07545882
ABSTRACT:
A transmission apparatus includes a frame configuration determiner that determines a modulation scheme, from among a plurality of modulation schemes. A first symbol generator modulates a transmission signal according the modulation scheme determined by the frame configuration determiner to generate a first symbol, the first symbol being a first quadrature baseband signal. A second symbol generator modulates a pilot signal in accordance with a specific modulation scheme to generate a second symbol. A third symbol generator generates a third symbol to be inserted immediately before or immediately after the second symbol, the third symbol being different from the first symbol. On a signal space diagram, the third symbol generator arranges a signal point of the third symbol on a virtual line that links an origin with a signal point of the second symbol.
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Matsuoka Akihiko
Murakami Yutaka
Orihashi Masayuki
Takabayashi Shinichiro
Deppe Betsy L
Greenblum & Bernstein P.L.C.
Panasonic Corporation
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