PEAK-TO-AVERAGE POWER RATIO MANAGEMENT FOR MULTI-CARRIER MODULATION IN WIRELESS COMMUNICATION SYSTEMS

• US 20100067474A1
• Filed: 11/19/2009
• Published: 03/18/2010
• Est. Priority Date: 02/18/2003
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Jha, Sanjay, Vijayan, Rajiv, Agrawal, Avneesh
• Granted Patent: US 10,064,179 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 27/2614 Peak power aspects
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0066 Requirements on out-of-channel emissions
• CPC Class Codes: H04W 52/343 taking into account loading or congestion level
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA

Abstract

Techniques for managing peak-to-average power ratio (PAPR) for multi-carrier modulation in wireless communication systems. Different terminals in a multiple-access system may have different required transmit powers. The number of carriers to allocate to each terminal is made dependent on its required transmit power. Terminals with higher required transmit powers may be allocated fewer carriers (associated with smaller PAPR) to allow the power amplifier to operate at higher power levels. Terminals with lower required transmit powers may be allocated more carriers (associated with higher PAPR) since the power amplifier is operated at lower power levels. The specific carriers to assign to the terminals may also be determined by their transmit power levels to reduce out-of-band emissions. Terminals with higher required transmit powers may be assigned with carriers near the middle of the operating band, and terminals with lower required transmit powers may be assigned with carriers near the band edges.

Claims

1. A method for multi-carrier communications, comprising:

transmitting, to an access network, scheduling information regarding an access terminal to be scheduled for data transmission; and

receiving, from the access network, an assignment message indicating a number of carriers assigned to the access terminal based on the scheduling information, wherein at least two carriers are assigned to the access terminal for simultaneous data transmission.

2. The method of claim 1, wherein the scheduling information includes at least one of a required transmit power, a maximum transmit power, a computed difference between the required and maximum transmit powers, and an initial transmit power.

3. The method of claim 2, wherein the required transmit power corresponds to a desired received signal quality.

4. The method of claim 2, wherein the maximum transmit power corresponds to a peak power level of a power amplifier used by the access terminal.

5. The method of claim 1, further comprising transmitting data using the assigned carriers and for a scheduled time period.

6. An apparatus in a multi-carrier communication system, comprising:

a controller configured to control transmitting, to an access network, scheduling information regarding an access terminal to be scheduled for data transmission, and to control receiving, from the access network, an assignment message indicating a number of carriers assigned to the access terminal based on the scheduling information, wherein at least two carriers are assigned to the access terminal for simultaneous data transmission; and

transceiver circuitry coupled to the controller.

7. The apparatus of claim 6, wherein the scheduling information includes at least one of a required transmit power, a maximum transmit power, a computed difference between the required and maximum transmit powers, and an initial transmit power.

8. The apparatus of claim 7, wherein the required transmit power corresponds to a desired received signal quality.

9. The apparatus of claim 7, wherein the maximum transmit power corresponds to a peak power level of a power amplifier used by the access terminal.

10. The apparatus of claim 6, wherein the controller is further configured to control transmitting data using the assigned carriers and for a scheduled time period.

11. An apparatus in a multi-carrier communication system, comprising:

means for transmitting, to an access network, scheduling information regarding an access terminal to be scheduled for data transmission; and

means for receiving, from the access network, an assignment message indicating a number of carriers assigned to the access terminal based on the scheduling information, wherein at least two carriers are assigned to the access terminal for simultaneous data transmission.

12. The apparatus of claim 11, wherein the scheduling information includes at least one of a required transmit power, a maximum transmit power, a computed difference between the required and maximum transmit powers, and an initial transmit power.

13. The apparatus of claim 12, wherein the required transmit power corresponds to a desired received signal quality.

14. The apparatus of claim 12, wherein the maximum transmit power corresponds to a peak power level of a power amplifier used by the access terminal.

15. The apparatus of claim 11, further comprising means for transmitting data using the assigned carriers and for a scheduled time period.

16. A computer-readable storage medium comprising code, which when executed by a machine, cause the machine to perform operations in a multi-carrier communication system, the computer-readable storage medium comprising:

code for transmitting, to an access network, scheduling information regarding an access terminal to be scheduled for data transmission; and

code for receiving, from the access network, an assignment message indicating a number of carriers assigned to the access terminal based on the scheduling information, wherein at least two carriers are assigned to the access terminal for simultaneous data transmission.

17. The computer-readable storage medium of claim 16, wherein the scheduling information includes at least one of a required transmit power, a maximum transmit power, a computed difference between the required and maximum transmit powers, and an initial transmit power.

18. The computer-readable storage medium of claim 17, wherein the required transmit power corresponds to a desired received signal quality.

19. The computer-readable storage medium of claim 17, wherein the maximum transmit power corresponds to a peak power level of a power amplifier used by the access terminal.

20. The computer-readable storage medium of claim 16, further comprising code for transmitting data using the assigned carriers and for a scheduled time period.