Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-04-18
2006-04-18
Deppe, Betsy L. (Department: 2637)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S146000
Reexamination Certificate
active
07031370
ABSTRACT:
An example spread spectrum communication system is provided in which a transmission signal is separated into an I-phase component and a Q-phase component. In a complex spreading portion, spreading is performed by using multipliers and adders together with a sequence pattern of 1 and −1 appearing alternately. The outputs from the complex spreading portion are modulated in multipliers using pseudo-random sequences PN(k)(x) allotted for individual users. The baseband signal undergoes waveform shaping by roll-off filters and is modulated through a carrier modulator, then sent to a power amplifier, where it is amplified and transmitted via an antenna.
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Deppe Betsy L.
Nixon & Vanderhye PC
Sharp Kabushika Kaisha
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