Apparatus for initial power control for spread-spectrum communications
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United States of America Patent
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Jul 4, 2006
Grant Date -
Oct 3, 2002
app pub date -
Dec 21, 2000
filing date -
Jun 30, 1995
priority date (Note) -
In Force
status (Latency Note)
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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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