Adaptive power control for a spread spectrum communications system and method
First Claim
1. An apparatus for adaptive-power control of a spread-spectrum transmitter of a mobile station operating in a cellular-communications network using spread-spectrum modulation, wherein a base station transmits a first spread-spectrum signal, said mobile station comprising:
- AGC means responsive to a received signal, wherein the received signal includes the first spread-spectrum signal and an interfering signal, for generating an AGC-output signal;
correlator means for despreading the AGC-output signal;
power means responsive to processing the received signal with the despread AGC-output signal, wherein said power means includes means for multiplying the received signal with the depread AGC-output signal, for generating a received-power level;
comparator means for generating a comparison signal by comparing the received-power level to a threshold level;
transmitter means for transmitting a second spread-spectrum signal;
an antenna; and
variable-gain means responsive to said comparison signal for adjusting a transmitter-power level of the second spread-spectrum signal from said transmitter means.
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Abstract
An apparatus for adaptive-power control of a spread-spectrum transmitter of a mobile station operating in a cellular-communications network using spread-spectrum modulation. A base station transmits a first spread-spectrum signal. A mobile station has an automatic-gain-control circuit for generating an AGC-output signal, from a received signal. The received signal includes the first spread-spectrum signal and an interfering signal. The mobile station also has a correlator for despreading the AGC-output signal, a power-measurement circuit responsive to processing the received signal with the despread AGC-output signal for generating a received-power level, a comparator coupled to the power-measurement circuit for generating a comparison signal by comparing the received-power level to a threshold level, a transmitter for transmitting a second spread-spectrum signal, an antenna, and a variable-gain device responsive to the comparison signal for adjusting a transmitter-power level of the second spread-spectrum signal.
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Citations
8 Claims
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1. An apparatus for adaptive-power control of a spread-spectrum transmitter of a mobile station operating in a cellular-communications network using spread-spectrum modulation, wherein a base station transmits a first spread-spectrum signal, said mobile station comprising:
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AGC means responsive to a received signal, wherein the received signal includes the first spread-spectrum signal and an interfering signal, for generating an AGC-output signal; correlator means for despreading the AGC-output signal; power means responsive to processing the received signal with the despread AGC-output signal, wherein said power means includes means for multiplying the received signal with the depread AGC-output signal, for generating a received-power level; comparator means for generating a comparison signal by comparing the received-power level to a threshold level; transmitter means for transmitting a second spread-spectrum signal; an antenna; and variable-gain means responsive to said comparison signal for adjusting a transmitter-power level of the second spread-spectrum signal from said transmitter means.
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2. An apparatus for adaptive-power control of a spread-spectrum transmitter of a mobile station operating in a cellular-communications network using spread-spectrum modulation, wherein a base station transmits a first spread-spectrum signal, said mobile station comprising:
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AGC means responsive to a received signal, wherein the received signal includes the first spread-spectrum signal and an interfering signal, for generating an AGC-output signal; correlator means for despreading the AGC-output signal; power means responsive to processing the received signal with the despread AGC-output signal, wherein said power means includes logarithmic means for adding the received signal with the depread AGC-output signal, for generating a received power level; comparator means for generating a comparison signal by comparing the received-power level to a threshold level; transmitter means for transmitting a second spread-spectrum signal; an antenna; and variable-gain means responsive to said comparison signal for adjusting a transmitter-power level of the second spread-spectrum signal from said transmitter means.
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3. An apparatus for determining a received-power level of a spread-spectrum signal, when a received signal includes the spread-spectrum signal and an interfering signal, comprising:
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AGC means responsive to the received signal for generating an AGC-output signal; correlator means, including a differential amplifier, for despreading the AGC-output signal; and power means responsive to processing the received signal with the despread AGC-output signal, wherein said power means includes means for multiplying the received signal with the despread AGC-output signal, for generating a received-power level.
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4. An apparatus for determining a received-power level of a spread-spectrum signal, when a received signal includes the spread-spectrum signal and an interfering signal, comprising:
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AGC means responsive to the received signal for generating an AGC-output signal; correlator means, including a differential amplifier, for despreading the AGC-output signal; and power means responsive to processing the received signal with the despread AGC-output signal, wherein said power means includes logarithmic means for adding the received signal with the despread AGC-output signal, for generating a received-power level.
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5. An apparatus for adaptive-power control of a spread-spectrum transmitter of a mobile station operating in a cellular-communications network using spread-spectrum modulation, wherein a base station transmits a first spread-spectrum signal and an APC-data signal, said mobile station comprising:
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decoder means for decoding the APC-data signal as a threshold level; AGC means responsive to a received signal, wherein the received signal includes the first spread-spectrum signal and an interfering signal, for generating an AGC-output signal; correlator means for despreading the AGC-output signal; power means responsive to processing the received signal with the despread AGC-output signal, wherein said power means includes means for multiplying the received signal with the despread AGC-output signal, for generating a received-power level; comparator means for generating a comparison signal by comparing the received-power level to said threshold level; transmitter means for transmitting a second spread-spectrum signal; an antenna; and variable-gain means responsive to said comparison signal for adjusting a transmitter-power level of the second spread-spectrum signal from said transmitter means.
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6. An apparatus for adaptive-power control of a spread-spectrum transmitter of a mobile station operating in a cellular-communications network using spread-spectrum modulation, wherein a base station transmits a first spread-spectrum signal and an APC-data signal, said mobile station comprising:
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decoder means for decoding the APC-data signal as a threshold level; AGC means responsive to a received signal, wherein the received signal includes the first spread-spectrum signal and an interfering signal, for generating an AGC-output signal; correlator means for despreading the AGC-output signal; power means responsive to processing the received signal with the despread AGC-output signal, wherein said power means includes logarithmic means for adding the received signal with the despread AGC-output signal, for generating a received-power level; comparator means for generating a comparison signal by comparing the received-power level to said threshold level; transmitter means for transmitting a second spread-spectrum signal; an antenna; and variable-gain means responsive to said comparison signal for adjusting a transmitter-power level of the second spread-spectrum signal from said transmitter means.
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7. An apparatus for determining a received-power level of a spread-spectrum signal, when a received signal includes the spread-spectrum signal and an interfering signal, comprising:
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AGC means responsive to the received signal for generating an AGC-output signal; correlator means for despreading the AGC-output signal; and power means responsive to processing the received signal with the despread AGC-output signal, wherein said power means includes means for multiplying the received signal with the despread AGC-output signal, for generating a received-power level.
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8. An apparatus for determining a received-power level of a spread-spectrum signal, when a received signal includes the spread-spectrum signal and an interfering signal, comprising:
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AGC means responsive to the received signal for generating an AGC-output signal; correlator means for despreading the AGC-output signal; and power means responsive to processing the received signal with the despread AGC-output signal, wherein said power means includes logarithmic means for adding the received signal with the despread AGC-output signal, for generating a received-power level.
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Specification