Pulse or digital communications – Spread spectrum
Reexamination Certificate
2011-03-08
2011-03-08
Ghayour, Mohammad H (Department: 2611)
Pulse or digital communications
Spread spectrum
C375S136000, C375S144000, C375S147000, C375S148000, C375S260000, C375S264000, C375S286000, C375S287000, C375S289000, C375S291000, C375S324000, C375S340000
Reexamination Certificate
active
07903717
ABSTRACT:
When a receiver (200) receives a signal transmitted from a transmitter, an A/D converter (204) converts the signal into a digital signal having two or more levels by A/D conversion. A zero-level detector (207) converts the signal into a two-level digital signal of positive and negative levels. The converted signals are subjected to spectrum despreading by correlators (206, 208), respectively. Whichever signal has a higher intensity is selected by absolute value detectors (209, 210), a comparator (211), and a switch (212). A decoder (213) decodes the selected signal. In a receiving state where the zero-level detector (207) is selected, the transmitter transmits the transmission signal after the signal is converted into a two-level signal. In a receiving state where the A/D converter (204) is selected, the transmitter transmits the transmission signal after the signal is converted into a signal having two or more levels.
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Ahn Chang-Jun
Harada Hiroshi
Takahashi Satoshi
Ghayour Mohammad H
Honigman Miller Schwartz and Cohn LLP
National Institute of Information and Communications Technology
Vlahos Sophia
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