Adaptive power control in wideband CDMA cellular systems (WCDMA) and methods of operation
AssigneeInternational Business Machines Corporation
InventorAli S. Sadri
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AssigneeInternational Business Machines Corporation
InventorAli S. Sadri
Estimating the term…
A WCDMA system includes a Base Station (BS) transmitter, or forward transmitter and a pilot channel that transmits control signals between the BS and a Mobile Station (MS) to reconfigure their transmitter/receiver. Reconfiguration is performed according to the prediction of the channel attenuation and the threshold set at the BS or MS based on its channel power probability density function separated into three distinct equal probable regions. In one embodiment, Seamless Rate Change (SRC)/Transmitter Power Control (TPC) logic uses the predicted channel attenuation to signal both the transmitter and the receiver in a channel to reconfigure their transmit power level according to the power density function (pdf) of the channel power and threshold level. A transmission rate is reduced when the power level is below the threshold and increased when the channel power is above threshold. The pilot channel is used to signal the mobile station and the base station.
A Wide-band Code Division Multiple Access (“WCDMA”) system comprising:
In a wide band code division multiple access (“WBCDMA”) system comprising a base station including a transmitter and a receiver, a mobile station including a transmitter and a receiver, dual channels coupled between the base station and the mobile station, each including a baseband signal having a variable transmission rate and a pilot channel coupling the base station and the mobile station, a method for improved throughput, channel capacity and transmit power control of the system, comprising the of;
Dependencies are inferred from the claim text.