Modulators – Pulse or interrupted continuous wave modulator – Pulse width modulator
Reexamination Certificate
2007-09-04
2011-12-06
Gannon, Levi (Department: 2817)
Modulators
Pulse or interrupted continuous wave modulator
Pulse width modulator
C332S112000, C330S251000, C375S238000, C375S239000
Reexamination Certificate
active
08072283
ABSTRACT:
In a device (10) for modulating Cartesian base band signals (I, Q) a first and second mapping unit (12, 14) each map signal samples of a corresponding Cartesian signal (I, Q) to intermediary signal sections having only two non-zero levels provided symmetrically around zero for forming two intermediary signals (S1, S2). A first and second processing unit (16, 18) each map each intermediary sections of an intermediary signal (S1, S2) to segments of a corresponding pulse train (S3, S4) through providing a positive pulse in one half of a segment if the corresponding signal section has a positive signal level and a positive pulse in another half of the segment if the corresponding signal section has a negative signal level. A delay unit (20) delays the pulses of one train in relation to the other and a combining unit (22) combines the trains for provision to a power amplifier (24).
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Malmqvist Hakan
Rexberg Leonard
Gannon Levi
Rothwell Figg Ernst & Manbeck P.C.
Telefonaktiebolaget L M Ericsson (publ)
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