Wireless subscriber communication unit and method of power control with back-off therefore
View Patent ↗A wireless subscriber communication unit comprises a transmitter having a power amplifier and a feedback power control loop having a power control function arranged to set an output power level of the power amplifier. The power control function is arranged to perform a back-off of the output power prior to completion of a transmission burst.
1. A wireless subscriber communication unit comprises a transmitter comprising:
a power amplifier; and
a closed loop analog feedback power control loop having a power control function arranged to set an output power level of the power amplifier,
wherein the power control function performs a back-off of the output power level, in response to a back-off of a power level provided to the power amplifier, prior to completion of a transmission burst.
2. The wireless subscriber communication unit according to claim 1 wherein the back-off of the output power level is initiated by the power control function a specified time before initiating a ramp-down process.
3. The wireless communication unit according to claim 2 , wherein the power control function varies the specified time on a per burst basis.
4. The wireless subscriber communication unit according to claim 3 wherein the specified time ranges between 1 μsec and 8 μsec.
5. The wireless subscriber communication unit according to claim 2 wherein the power control function performs the back-off of the output power level prior to completion of the transmission burst for a subset of a range of output power levels.
6. The wireless communication unit according to claim 2 , wherein the power control function performs the back-off of the output power level varied on a per burst basis.
7. The wireless subscriber communication unit according to claim 2 wherein the back-off of the output power level ranges between 0.1 dB and 0.5 dB.
8. The wireless subscriber communication unit according to claim 1 wherein the power control function performs the back-off of the output power level prior to completion of a transmission burst for a subset of a range of output power levels.
9. The wireless communication unit according to claim 1 , wherein the power control function performs the back-off of the output power level varied on a per burst basis.
10. The wireless subscriber communication unit according to claim 9 wherein the back-off of the output power level ranges between 0.1 dB and 0.5 dB.
11. The wireless communication unit according to claim 1 , wherein the power control function is operably coupled to a power control processor function and arranged to toggle one or more bit(s) within a digital signal prior to initiating the back-off of the output power level.
12. A method of power control in a wireless subscriber communication unit comprising a transmitter having a closed loop analog feedback power control loop having a power control function, the method comprising the steps of:
setting an output power level of the transmitter by the power control function;
transmitting a data burst; and
performing a back-off of the output power level, in response to performing a back-off of a power level provided to a power amplifier, prior to completion of a transmission burst by the power control function.
13. The method according to claim 12 wherein the step of performing a back-off of the output power level comprises performing the back-off a specified time before initiating a ramp-down process.
14. The method according to claim 13 , wherein the step of performing the back-off of the output power level further comprises varying the specified time on a per burst basis.
15. The method according to claim 13 wherein the step of performing the back-off of the output power level comprises performing the back-off of the output power level prior to completion of the transmission burst for a subset range of an output power level range.
16. The method according to claim 13 , wherein the step of performing the back-off of the output power level further comprises varying the back-off level of the output power level on a per burst basis.
17. The method according to claim 12 wherein the step of performing the back-off of the output power level comprises performing the back-off of the output power level prior to completion of the transmission burst for a subset range of an output power level range.
18. The method according to claim 12 , wherein the step of performing the back-off of the output power level further comprises varying the back-off level of the output power level on a per burst basis.
19. The method according to claim 12 , wherein the step of performing the back-off of the output power level comprises toggling one or more bit(s) within a digital signal prior to performing the back-off of the output power level.
20. An integrated circuit for use in a wireless communication device comprising:
a transmitter;
a closed loop analog feedback power control loop having a power amplifier; and
a power control function arranged to set an output power level of the transmitter, wherein the power control function performs a back-off of the output power level, in response to a back-off of a power level provided to the power amplifier, prior to completion of a transmission burst.