SPREAD SPECTRUM CELLULAR SUBSCRIBER UNIT

• US 20080242367A1
• Filed: 06/09/2008
• Published: 10/02/2008
• Est. Priority Date: 11/16/1990
• Status: Abandoned Application

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Garodnick, Joseph, Schilling, Donald L., Lomp, Gary, Moore, Timothy F.
• Application Number:
  US12/135,650
• Publication Number:
  US 20080242367A1
• Time in Patent Office: Days
• US Class Current: 455/571
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/7075 with code phase acquisition
• CPC Class Codes: H04W 52/221 using past power control commands
• CPC Class Codes: H04W 52/225 Calculation of statistics, e.g. average, variance
• CPC Class Codes: H04W 52/228 using past power values or information
• CPC Class Codes: H04W 52/52 using AGC [Automatic Gain Control] circuits or amplifiers

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.

Claims

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.