US 9,544,897 B2 · Peak-to-average power ratio management for multi-carrier modulation in wireless communication systems

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.

Claims37

Dependent claims

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 for data transmission between an access point and at least one terminal in a plurality of terminals based on a determined required transmit power for the at least one terminal, the determined required transmit power being based on path loss or received signal quality or both associated with the at least one terminal relative to the access point;
computing a difference between a maximum transmit power for the at least one terminal and the determined required transmit power for the at least one terminal corresponding to the path loss or the received signal quality associated with the at least one terminal, wherein determining the maximum number of carriers that may be allocated to the at least one terminal is based on the computed difference;
and
allocating for the data transmission between the access point and the at least one terminal, a specific number of carriers based at least on the maximum number of carriers determined for the data transmission between the access point and the at least one terminal, wherein multiple carriers are allocated for the data transmission between the access point and the at least one terminal, and wherein the specific number is larger than another number of carriers allocated for data transmission to or from another terminal having higher transmit power that operates at a smaller back-off relative to said at least one terminal.

1 more element

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

means for determining a maximum number of carriers that may be allocated for data transmission between an access point and at least one terminal in a plurality of terminals based on a determined required transmit power for the at least one terminal corresponding to path losses or desired signal qualities or both associated with the at least one terminal relative to the access point;
means for computing a difference between a maximum transmit power for the at least one terminal and the determined required transmit power for the at least one terminal corresponding to the path losses and the desired signal qualities associated with the at least one terminal, wherein the means for determining the maximum number of carriers that may be allocated to the at least one terminal comprises means for determining the maximum number of carriers that may be allocated to the at least one terminal based on the computed difference;
and
means for allocating for the data transmission between the access point and the at least one terminal, a specific number of carriers that is less than or equal to the maximum number of carriers determined for the data transmission between the access point and the at least one terminal, wherein multiple carriers are allocated for the data transmission between the access point and the at least one terminal, and wherein the specific number is larger than another number of carriers allocated for data transmission to or from another terminal having higher transmit power that operates at a smaller back-off relative to said at least one terminal.

1 more element

An access point in a wireless multi-carrier communication system, comprising:

a scheduler operative to:
determine a maximum number of carriers that may be allocated for data transmission between an access point and at least one terminal in a plurality of terminals based on a determined required transmit power for the at least one terminal, the determined required transmit power being based on path loss or received signal quality or both associated with the at least one terminal relative to the access point,
compute a difference between a maximum transmit power for the at least one terminal and the determined required transmit power for the at least one terminal corresponding to the path loss or the received signal quality associated with the at least one terminal relative to the access point, wherein the maximum number of carriers that may be allocated for the data transmission between the access point and the at least one terminal is based on the computed difference,
allocate for the data transmission between the access point and the at least one terminal a specific number of carriers based on the maximum number of carriers determined for the data transmission between the access point and the at least one terminal, wherein multiple carriers are allocated for the data transmission between the access point and the at least one terminal, and
provide carrier assignments indicative of the specific number of carriers allocated for the data transmission between the access point and the at least one terminal;
and
a transmit data processor operative to process the carrier assignments for the data transmission between the access point and the at least one terminal;
wherein the specific number is larger than another number of carriers allocated for data transmission to or from another terminal having higher transmit power that operates at a smaller back-off relative to the at least one terminal.

5 more elements

A non-transitory computer-readable medium, comprising:

code for causing a computer to:
determine a maximum number of carriers that may be allocated for data transmission between an access point and at least one terminal in a plurality of terminals based on a determined required transmit power for the terminal, the determined required transmit power being based on path loss or received signal quality or both associated with the at least one terminal relative to the access point;
compute a difference between a maximum transmit power for the at least one terminal and the determined required transmit power for the at least one terminal corresponding to the path loss or the received signal quality or both associated with the at least one terminal relative to the access point, wherein the maximum number of carriers that may be allocated for data transmission between an access point and the at least one terminal is determined based on the computed difference;
and
allocate for the data transmission between the access point and the at least one terminal a specific number of carriers based at least on the maximum number of carriers determined for the data transmission between the access point and the at least one terminal, wherein multiple carriers are allocated for the data transmission between the access point and the at least one terminal and the specific number is larger than another number of carriers allocated for data transmission to or from another terminal having higher transmit power that operates at a smaller back-off relative to said at least one terminal.

2 more elements

Dependencies are inferred from the claim text.

Peak-to-average power ratio management for multi-carrier modulation in wireless communication systems

Life of this patent

Peak-to-average power ratio management for multi-carrier modulation in wireless communication systems

Life of this patent

Abstract

Claims37