Spread spectrum cellular subscriber unit

Abstract

A spread spectrum base station comprises an automatic gain control (AGC) circuit having an input configured to receive a received spread spectrum signal and gain control the received spread spectrum signal to produce a gain controlled signal. A correlation circuit has an input configured to receive the gain controlled signal and correlate the gain controlled signal with a code to produce a despread signal. A power measurement and comparator circuit is configured to receive the despread signal and a control level of the AGC circuit. The circuit processes at least the despread signal and the control level to produce a processed signal and compares the processed signal with a threshold to produce a comparison signal. The comparison signal is used to produce a power command. A multiplexer multiplexes the power command with a signal for transmission over an antenna.

1 . A cellular subscriber unit comprising:
 an antenna configured to receive a first signal including a parameter from a base station;   a circuit operatively coupled to the antenna configured to determine a first power level associated with the first signal, wherein the circuit is further configured to determine a second power level based on the first power level and the parameter; and   the circuit further configured to transmit a second signal at the second power level using the antenna.   
   
   
       2 . The cellular subscriber unit of  claim 1 , wherein information associated with the parameter is time division multiplexed over the first signal. 
   
   
       3 . The cellular subscriber unit of  claim 1 , further comprising a filter circuit. 
   
   
       4 . The cellular subscriber unit of  claim 3 , wherein the filter circuit is a bandpass filter. 
   
   
       5 . The cellular subscriber unit of  claim 3 , further comprising a decoder circuit. 
   
   
       6 . The cellular subscriber unit of  claim 5 , further comprising a gain device. 
   
   
       7 . The cellular subscriber unit of  claim 6 , further comprising a multiplexer circuit. 
   
   
       8 . A method for use in a cellular subscriber unit, the method comprising:
 receiving a first signal including a parameter from a base station;   determining a first power level associated with the first signal;   determining a second power level based on the first power level and the parameter; and   transmitting a second signal at the second power level.   
   
   
       9 . The method of  claim 8 , wherein information associated with the parameter is time division multiplexed over the first signal. 
   
   
       10 . The method of  claim 8 , further comprising filtering the first signal. 
   
   
       11 . The method of  claim 10 , wherein the filtering is performed using a bandpass filter. 
   
   
       12 . A cellular subscriber unit comprising:
 an antenna configured to receive a first signal carrying a first channel and a second channel from a base station, wherein the second channel includes a parameter;   a circuit operatively coupled to the receiver configured to determine a first power level associated with the first channel, wherein the circuit is further configured to determine a second power level based on the first power level and the parameter; and   the circuit further configured to transmit a second signal at the second power level using the antenna.   
   
   
       13 . The cellular subscriber unit of  claim 12 , wherein information associated with the parameter is time division multiplexed over the first signal. 
   
   
       14 . The cellular subscriber unit of  claim 12 , further comprising a filter circuit. 
   
   
       15 . The cellular subscriber unit of  claim 12 , wherein the filter circuit is a bandpass filter. 
   
   
       16 . The cellular subscriber unit of  claim 12 , further comprising a decoder circuit. 
   
   
       17 . The cellular subscriber unit of  claim 16 , further comprising a gain device. 
   
   
       18 . The cellular subscriber unit of  claim 17 , further comprising a multiplexer circuit. 
   
   
       19 . A method for use in a cellular subscriber unit, the method comprising:
 receiving a first signal carrying first and second channels from a base station, wherein the second channel includes a parameter;   determining a first power level associated with the first channel;   determining a second power level based on the first power level and the parameter;   transmitting a second signal at the second power level.   
   
   
       20 . The method of  claim 19 , wherein information associated with the parameter is time division multiplexed over the first signal. 
   
   
       21 . The method of  claim 19 , further comprising filtering the first signal. 
   
   
       22 . The method of  claim 21 , wherein the filtering is carried out with a bandpass filter.