PEAK-TO-AVERAGE POWER RATIO MANAGEMENT FOR MULTI-CARRIER MODULATION IN WIRELESS COMMUNICATION SYSTEMS
First Claim
1. A method of managing peak-to-average power ratio (PAPR) for multi-carrier modulation in a wireless multi-carrier communication system, comprising:
- determining a maximum number of carriers that may be allocated to each terminal in a plurality of terminals based on a required transmit power for the terminal;
comparing the required transmit power for the terminal against maximum allowed powers for different numbers of carriers, and wherein the maximum number of carriers that may be allocated to the terminal is equal to the number of carriers associated with a smallest maximum allowed power that is higher than the required transmit power; and
allocating to each terminal a specific number of carriers that is less than or equal to the maximum number of carriers determined for the terminal.
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Accused Products
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.
66 Citations
22 Claims
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1. A method of managing peak-to-average power ratio (PAPR) for multi-carrier modulation in a wireless multi-carrier communication system, comprising:
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determining a maximum number of carriers that may be allocated to each terminal in a plurality of terminals based on a required transmit power for the terminal; comparing the required transmit power for the terminal against maximum allowed powers for different numbers of carriers, and wherein the maximum number of carriers that may be allocated to the terminal is equal to the number of carriers associated with a smallest maximum allowed power that is higher than the required transmit power; and allocating to each terminal a specific number of carriers that is less than or equal to the maximum number of carriers determined for the terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus in a wireless multi-carrier communication system, comprising:
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means for determining a maximum number of carriers that may be allocated to each terminal in a plurality of terminals based on a required transmit power for the terminal; means for comparing the required transmit power for the terminal against maximum allowed powers for different numbers of carriers, and wherein the maximum number of carriers that may be allocated to the terminal is equal to the number of carriers associated with a smallest maximum allowed power that is higher than the required transmit power; and means for allocating to each terminal a specific number of carriers that is less than or equal to the maximum number of carriers determined for the terminal. - View Dependent Claims (14, 15, 16)
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17. An access point in a wireless multi-carrier communication system, comprising:
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a scheduler operative to determine a maximum number of carriers that may be allocated to each terminal in a plurality of terminals based on a required transmit power for the terminal, to compare the required transmit power for the terminal against maximum allowed powers for different numbers of carriers, and wherein the maximum number of carriers that may be allocated to the terminal is equal to the number of carriers associated with a smallest maximum allowed power that is higher than the required transmit power, to allocate to each terminal a specific number of carriers that is less than or equal to the maximum number of carriers determined for the terminal, and to provide carrier assignments indicative of the specific number of carriers allocated to each terminal; and a transmit data processor operative to process the carrier assignments for transmission to the plurality of terminals.
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18. A method of transmitting data using multi-carrier modulation in a wireless communication system, comprising:
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receiving an allocation of a specific number of carriers to be used by a terminal for data transmission, wherein the specific number of carriers is less then or equal to a maximum number of carriers that may be used for data transmission, and wherein the maximum number of carriers is determined based on comparing a required transmit power for the terminal against maximum allowed powers for different numbers of carriers, and wherein the maximum number of carriers that may be allocated to the terminal is equal to the number of carriers associated with a smallest maximum allowed power that is higher than the required transmit power; and transmitting data using the specific number of carriers. - View Dependent Claims (19)
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20. An apparatus in a wireless multi-carrier communication system, comprising:
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means for receiving an allocation of a specific number of carriers to be used by a terminal for data transmission, wherein the specific number of carriers is less then or equal to a maximum number of carriers that may be used for data transmission, and wherein the maximum number of carriers is determined based on comparing the required transmit power for the terminal against maximum allowed powers for different numbers of carriers, and wherein the maximum number of carriers that may be allocated to the terminal is equal to the number of carriers associated with a smallest maximum allowed power that is higher than the required transmit power; and means for transmitting data using the specific number of carriers.
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21. A computer-readable medium, comprising:
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code for causing a computer to; determine a maximum number of carriers that may be allocated to each terminal in a plurality of terminals based on a required transmit power for the terminal; compare the required transmit power for the terminal against maximum allowed powers for different numbers of carriers, and wherein the maximum number of carriers that may be allocated to the terminal is equal to the number of carriers associated with a smallest maximum allowed power that is higher than the required transmit power; and allocate to each terminal a specific number of carriers that is less than or equal to the maximum number of carriers determined for the terminal.
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22. A computer-readable medium, comprising:
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code for causing a computer to; receive an allocation of a specific number of carriers to be used by a terminal for data transmission, wherein the specific number of carriers is less then or equal to a maximum number of carriers that may be used for data transmission, and wherein the maximum number of carriers is determined based on comparing a required transmit power for the terminal against maximum allowed powers for different numbers of carriers, and wherein the maximum number of carriers that may be allocated to the terminal is equal to the number of carriers associated with a smallest maximum allowed power that is higher than the required transmit power; and transmit data using the specific number of carriers.
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Specification