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 said each terminal;
wherein the determining comprises comparing the required transmit power for said each terminal against a plurality of maximum allowed powers associated with a corresponding plurality of numbers of carriers, wherein the maximum number of carriers that may be allocated to said each 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 multiple carriers to a specific terminal that is capable of multi-carrier modulation, wherein a specific number of the multiple carriers is less than or equal to the maximum number of carriers determined for the specific 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.
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Citations
24 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 said each terminal; wherein the determining comprises comparing the required transmit power for said each terminal against a plurality of maximum allowed powers associated with a corresponding plurality of numbers of carriers, wherein the maximum number of carriers that may be allocated to said each 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 multiple carriers to a specific terminal that is capable of multi-carrier modulation, wherein a specific number of the multiple carriers is less than or equal to the maximum number of carriers determined for the specific terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 24)
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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 of said each terminal; wherein the means for determining comprises means for comparing the required transmit power of said each terminal against a plurality of maximum allowed powers associated with a corresponding plurality of numbers of carriers, wherein the maximum number of carriers that may be allocated to said each 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 multiple carriers to a specific terminal that is capable of multi-carrier modulation, wherein a specific number of the multiple carriers is less than or equal to the maximum number of carriers determined for the specific 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 of said each terminal based on comparison of the required transmit power of said each terminal against a plurality of maximum allowed powers associated with a corresponding plurality of numbers of carriers, wherein the maximum number of carriers that may be allocated to said each 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 multiple carriers to a specific terminal that is capable of multi-carrier modulation, wherein a specific number of the multiple carriers is less than or equal to the maximum number of carriers determined for the specific terminal, and to provide carrier assignments indicative of the specific number of carriers allocated to the specific terminal; and a transmit data processor operative to process the carrier assignments for transmission to the specific terminal.
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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 multiple carriers to be used for data transmission by a terminal that is capable of multi-carrier modulation, wherein a specific number of the multiple carriers is less than 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 a plurality of maximum allowed powers associated with a corresponding plurality of numbers of carriers, 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 multiple carriers to be used for data transmission by a terminal that is capable of multi-carrier modulation, wherein a specific number of the multiple carriers is less than 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 a plurality of maximum allowed powers associated with a corresponding plurality of numbers of carriers, 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 non-transitory 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 of said each terminal; wherein the code for causing the computer to determine comprises code to compare the required transmit power of said each terminal against a plurality of maximum allowed powers associated with a corresponding plurality of numbers of carriers, wherein the maximum number of carriers that may be allocated to said each 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 multiple carriers to a specific terminal that is capable of multi-carrier modulation, wherein a specific number of the multiple carriers is less than or equal to the maximum number of carriers determined for the specific terminal.
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22. A non-transitory computer-readable medium, comprising:
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code for causing a computer to; receive an allocation of multiple carriers to be used for data transmission by a terminal that is capable of multi-carrier modulation, wherein a specific number of the multiple carriers is less than 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 a plurality of maximum allowed powers associated with a corresponding plurality of numbers of carriers, 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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23. An apparatus for use in a wireless communication system, comprising:
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a receiver configured to receive an allocation of multiple carriers to be used for data transmission by a terminal that is capable of multi-carrier modulation, wherein a specific number of the multiple carriers is less than 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 a plurality of maximum allowed powers associated with a corresponding plurality of numbers of carriers, 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 a transmitter configured to transmit data using the specific number of carriers.
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Specification