Adaptive power control for a spread spectrum communications system and method

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 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.

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:

• 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.

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:

• 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.

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:

• 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.

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:

• 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.

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:

• 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.

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:

• 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.