Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2006-08-01
2006-08-01
Ha, Dac (Department: 2634)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S261000, C375S271000, C375S371000, C375S362000, C370S215000, C370S252000, C370S233000, C370S234000, C455S042000, C455S043000, C455S067160, C455S110000
Reexamination Certificate
active
07085327
ABSTRACT:
An improvement for a phasor fragmentation engine and method, whereby a phasor flipping algorithm is applied when determining fragment phasors for a non-constant envelope modulation signal (e.g. OFDM). The phasor flipping algorithm avoids sharp phase transitions for the fragment phasors, which cause an increase in bandwidth, by performing a comparison of the phasor angle separation between the prior and current time samples. This comparison corresponds to a determination of whether the modulation signal V has passed near or through zero. When it is determined that the calculated phases of Vαand Vβwould result in a larger angle of separation between the calculated phase of Vα(for phasor A) for the current time sample (N) and the phase of VAfor the previous time sample (N−1) than the angle of separation between the calculated phase of Vβ(for phasor B) for the current time sample (N) and the phase of VAfor the previous time sample (N−1), the phase values for the phasor fragments Vαand Vβare swapped so that the phase of VAis that of Vβ(i.e. VA=Vβ) and the phase of VBis that of Vα(i.e. VB=Vα).
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DeCruyenaere Jean-Paul R.
Hobbs Stephen R.
Parker Kevin R.
Berkeley Law & Technology Group
Ha Dac
Wong Linda
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