Apparatus and method for mobile communication device transmission

• US 7,342,955 B2
• Filed: 04/23/2003
• Issued: 03/11/2008
• Est. Priority Date: 04/23/2003
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Trocke, Robert S., Schirmann, Ernest, Klomsdorf, Armin, Forest, Francis
• Primary Examiner(s): Ahn; Sam K.
• Application Number:
  US10/421,113
• Publication Number:
  US 20040213335A1
• Time in Patent Office: 1,784 Days
• Field of Search: 375/219, 375/312, 375/297, 375/220, 375/295, 375/296, 375/358, 455/73, 455/114.3, 455/108, 455/126, 455/522, 398/193
• US Class Current: 375/219
• CPC Class Codes: H03F 1/0205 in transistor amplifiers
• CPC Class Codes: H03F 1/0261 with control of the polarisation voltage or current, e.g. gliding Class A
• CPC Class Codes: H04B 1/0475 with means for limiting noise, interference or distortion H04B1/0483 takes precedence

Abstract

An apparatus and method for transmission power amplifier bias control in an enhanced data rate for global system mobile evolution mobile communication device. The apparatus can include a transmitter configured to transmit information on an enhanced data rate for global system mobile evolution network at a first transmitter output power. The transmitter can include a modulator configured to receive an input signal and map information in the input signal to symbols represented by eight phase offsets and a power amplifier configured to provide the first transmitter output power for transmitting the symbols represented by eight phase offsets. The apparatus can also include a controller configured to adjust a first bias condition of the power amplifier to a second bias condition based on a changed parameter of operation related to the data stored in a memory.

Claims

1. An enhanced data rate for global system mobile evolution mobile communication device comprising:

an antenna;

a receiver coupled to the antenna, the receiver configured to receive, from an enhanced data rate for global system mobile evolution base station, a first time slot assignment and a first power level requirement associated with the first time slot assignment;

a transmitter coupled to the antenna, the transmitter configured to transmit information on an enhanced data rate for global system mobile evolution network at a first transmitter output power based on the first power level requirement, the transmitter including;

a modulator configured to receive an input signal and map information in the input signal to symbols represented by eight phase offsets; and

a power amplifier coupled to the modulator and coupled to the antenna, the power amplifier providing the first transmitter output power for transmitting the symbols represented by eight phase offsets, the power amplifier operating at a first operating point set by a first bias condition based on the first power level requirement;

a memory including data stored in the memory, the data related to parameters of operation of the enhanced data rate for global system mobile evolution mobile communication device, the parameters of operation including bias conditions and power level requirements; and

a controller coupled to the power amplifier and coupled to the memory, the controller configured to adjust the first bias condition to a second bias condition based on a changed parameter of operation related to the data stored in the memory.

2. The enhanced data rate for global system mobile evolution mobile communication device according to claim 1,

wherein the receiver is further configured to receive, from an enhanced data rate for global system mobile evolution base station, a second time slot assignment and a second power level requirement associated with the second time slot assignment, and

wherein the controller is further configured to adjust the first bias condition to the second bias condition based on the second power level requirement and based on the data stored in the memory.

3. The enhanced data rate for global system mobile evolution mobile communication device according to claim 2, wherein the controller is further configured to adjust the first bias condition to the second bias condition during a transition period between periods of transmitting the mapped information.

4. The enhanced data rate for global system mobile evolution mobile communication device according to claim 3, wherein the transition period is a period between the first time slot and the second time slot.

5. The enhanced data rate for global system mobile evolution mobile communication device according to claim 3, wherein the transition period is a period between a first frame and a second frame.

6. The enhanced data rate for global system mobile evolution mobile communication device according to claim 2, wherein the controller is further configured to adjust the first bias condition to the second bias condition by ramping the first bias condition to the second bias condition.

7. The enhanced data rate for global system mobile evolution mobile communication device according to claim 6, wherein ramping comprises incrementally adjusting the bias condition in steps between the first bias condition and the second bias condition.

8. The enhanced data rate for global system mobile evolution mobile communication device according to claim 2, wherein the controller is further configured to reduce the bias condition from the first bias condition to the second bias condition based on the second power level requirement being less than the first power level requirement.

9. The enhanced data rate for global system mobile evolution mobile communication device according to claim 1, wherein the modulator is further configured to map information in the input signal to symbols represented by phase rotation.

10. The enhanced data rate for global system mobile evolution mobile communication device according to claim 1, further comprising a signal router coupled between the antenna and the power amplifier and coupled between the antenna and the receiver, the signal router configured to route a transmit signal and configured to route a receive signal.

11. The enhanced data rate for global system mobile evolution mobile communication device according to claim 1, wherein the data related to parameters of operation is based on bias conditions chosen to reduce a current drain of the power amplifier while maintaining power level and spectral emission requirements received from the enhanced data rate for global system mobile evolution base station.

12. The enhanced data rate for global system mobile evolution mobile communication device according to claim 1, wherein the transmitter is further configured to transmit information on the enhanced data rate for global system mobile evolution network during the first timeslot at a first transmitter output power based on the first power level requirement.

13. A method of operating a power amplifier in an enhanced data rate for global system mobile evolution mobile communication device comprising:

receiving a first time slot assignment and a first power level requirement associated with the first time slot assignment from an enhanced data rate for global system mobile evolution base station;

determining a power amplifier first bias condition based on the first power level requirement;

mapping information to symbols, the symbols represented by eight phase offsets, to obtain mapped information;

transmitting the mapped information using the power amplifier operating at a first operating point set by the first bias condition;

adjusting the first bias condition of the power amplifier to a second bias condition; and

transmitting the mapped information using the power amplifier operating at a second operating point set by the second bias condition.

14. The method according to claim 13,

wherein transmitting the mapped information using the power amplifier operating at the first operating point set by the first bias condition includes transmitting the mapped information in a first time slot assigned by the first time slot assignment;

and

wherein transmitting information using the power amplifier operating at the second operating point set by the second bias condition includes transmitting the mapped information in a second time slot.

15. The method according to claim 14, wherein the first time slot is adjacent to the second time slot.

16. The method according to claim 13, wherein adjusting further comprises reducing a transmit power level of the power amplifier to adjust the first bias condition of the power amplifier to a second bias condition.

17. The method according to claim 13, wherein adjusting further comprises ramping the bias condition from the first bias condition to the second bias condition.

18. The method according to claim 17, wherein ramping comprises incrementally adjusting the bias condition in steps between the first bias condition and the second bias condition.

19. The method according to claim 13, wherein adjusting further comprises reducing the power of the power amplifier in between time slots to adjust the first bias condition of the power amplifier to a second bias condition.

20. The method according to claim 13, wherein determining further comprises determining the power amplifier first bias condition based on the power level requirement and based on data stored in a memory of the mobile communication device, the data related to parameters of operation of the enhanced data rate for global system mobile evolution mobile communication device, the parameters of operation including bias conditions and the power level requirements.

21. The method according to claim 13, further comprising:

receiving a second time slot assignment and a second power level requirement associated with the second time slot assignment from an enhanced data rate for global system mobile evolution base station; and

determining whether the second power level requirement is less than the first power level requirement,

wherein adjusting the first bias condition of the power amplifier to a second bias condition reduces a bias condition based on the second power level requirement being less than the first power level requirement.

22. The method according to claim 13, further comprising mapping the information to symbols represented by phase rotation.

23. An enhanced data rate for global system mobile evolution mobile communication device comprising:

an antenna;

a signal router coupled to the antenna, the signal router configured to route a transmit signal and route a receive signal;

a receiver coupled to the signal router, the receiver configured to receive, from an enhanced data rate for global system mobile evolution base station, a first time slot assignment, a first power level requirement associated with the first time slot assignment, a second time slot assignment, and a second power level requirement associated with the second time slot assignment;

a transmitter coupled to the signal router, the transmitter configured to transmit information on an enhanced data rate for global system mobile evolution network, the transmitter including;

a modulator configured to receive an input signal, map information in the input signal to symbols represented by phase rotation during the first time slot assignment, and map information to symbols represented by eight phase offsets during the second time slot assignment; and

a power amplifier coupled to the modulator and coupled to the signal router, the power amplifier configured to transmit the symbols represented by phase rotation during the first time slot assignment at a first operating point set by a first bias condition based on the first power level requirement and transmit the symbols represented by eight phase offsets during the second time slot assignment at a second operating point set by a second bias condition based on the second power level requirement;

a memory including data stored in the memory, the data related to parameters of operation of the enhanced data rate for global system mobile evolution mobile communication device, the parameters of operation including bias conditions and power level requirements; and

a controller coupled to the power amplifier, the controller configured to adjust the first bias condition to the second bias condition, during a transition period in information transmission, based on a changed parameter of operation related to the data stored in the memory.