Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-07-04
2006-07-04
Patel, Jay K. (Department: 2637)
Pulse or digital communications
Spread spectrum
Direct sequence
C455S069000, C455S522000
Reexamination Certificate
active
07072380
ABSTRACT:
A code-division-multiple-access (CDMA) system employing spread-spectrum modulation. The CDMA system has a base station (BS), and a plurality of subscriber units (SUs). The signals transmitted between the BS and SU use spread-spectrum modulation. The apparatus for maintaining control of power from an SU to a BS, comprises sending from the SU, using spread-spectrum modulation, a SU-spreading code, and detecting at the base station, the SU-spreading code from the SU. In response to detecting the SU-spreading code at the BS, a BS-spreading code is sent to the SU, using spread-spectrum modulation. At the SU, if the BS-spreading code is detected, then transmit power of the SU is reduced. If the BS-spreading code is not detected at the SU, then transmit power of the SU is increased.
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Kowalski John
Lomp Gary R.
Ozluturk Fatih M.
InterDigital Technology Corporation
Meek Jacob
Patel Jay K.
Volpe and Koenig P.C.
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