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Apparatus for adaptive reverse power control for spread-spectrum communications

  • US 6,940,840 B2
  • Filed: 02/21/2001
  • Issued: 09/06/2005
  • Est. Priority Date: 06/30/1995
  • Status: Expired due to Fees
First Claim
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1. An apparatus for adaptive reverse control of power (APC) from a subscriber unit (SU) to a base station (BS), comprising:

  • said subscriber unit for sending to said base station, using spread-spectrum modulation, a SU-spreading code on a reverse channel;

    said base station unit for despreading the SU-spreading code on the reverse channel as a despread signal, for determining a first power level Pd from the despread signal, whereby the first power level Pd includes the power of the despread signal plus noise, for determining a second power level PN, whereby the second power level includes the power of the despread noise, for determining a first error signal e1, from the first power level Pd, the second power level PN, and a required signal-to-noise ratio SNRREQ for service type, for determining a second error signal e2, from a measure of total received power Prt and an automatic gain control (AGC) set point Po, for forming a combined error signal from the first error signal e1, the second error signal e2, a first weight a1 and a second weight a2, with the first weight a1 and the second weight a2 chosen for each service type, for hard limiting the combined error signal to form a single APC bit, and for transmitting the APC bit to the subscriber unit; and

    said subscriber unit for receiving the APC bit and, in response to the APC bit, for adjusting transmitter power to the base station.

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