Peak-to-average power ratio (PAPR) reduction scheme for wireless communication

An apparatus for wireless communication, comprising:

• means for selecting phases for a plurality of resource blocks based on a metric;
• and means for applying the selected phases to modulation symbols to be sent on the plurality of resource blocks,
• wherein the modulation symbols comprise data symbols and pilot symbols, wherein multiple phases are selected for multiple spatial layers in each resource block, one phase for each spatial layer, and wherein each phase is applied to all data symbols and pilot symbols to be sent on one spatial layer in one resource block, and
• wherein the means for applying the selected phases comprises means for assigning each spatial layer with a different subset of resource elements used for pilot transmission in each resource block,
• means for applying the phase for each spatial layer in each resource block to pilot symbols to be sent on the subset of resource elements assigned to the spatial layer for pilot transmission, and
• means for applying the phase for each spatial layer in each resource block to data symbols to be sent on resource elements used for data transmission in the resource block,
• wherein the metric comprises a peak-to-average power ratio (PAPR) or a cubic metric.

An apparatus for wireless communication, comprising:

• at least one processor configured to select phases for a plurality of resource blocks based on a metric, and to apply the selected phases to modulation symbols to be sent on the plurality of resource blocks,
• wherein the modulation symbols comprise data symbols and pilot symbols, and
• wherein the at least one processor is configured to select multiple phases for multiple spatial layers in each resource block, one phase for each spatial layer, and to apply each phase to all data symbols and pilot symbols to be sent on one spatial layer in one resource block, and
• wherein the at least one processor is configured to assign each spatial layer with a different subset of resource elements used for pilot transmission in each resource block,
• apply the phase for each spatial layer in each resource block to pilot symbols to be sent on the subset of resource elements assigned to the spatial layer for pilot transmission, and
• apply the phase for each spatial layer in each resource block to data symbols to be sent on resource elements used for data transmission in the resource block;
• wherein the metric comprises a peak-to-average power ratio (PAPR) or a cubic metric.

A non-transitory computer-readable medium comprising a computer-program product having instructions thereon, the instructions comprising:

• code for causing at least one computer to select phases for a plurality of resource blocks based on a metric, and code for causing the at least one computer to apply the selected phases to modulation symbols to be sent on the plurality of resource blocks wherein the modulation symbols comprise data symbols and pilot symbols,
• wherein multiple phases are selected for multiple spatial layers in each resource block, one phase for each spatial layer, and wherein each phase is applied to all data symbols and pilot symbols to be sent on one spatial layer in one resource block, and
• wherein the code for causing the at least one computer to apply the selected phases comprises code for causing the at least one computer to assign each spatial layer with a different subset of resource elements used for pilot transmission in each resource block,
• code for causing the at least one computer to apply the phase for each spatial layer in each resource block to pilot symbols to be sent on the subset of resource elements assigned to the spatial layer for pilot transmission, and
• code for causing the at least one computer to apply the phase for each spatial layer in each resource block to data symbols to be sent on resource elements used for data transmission in the resource block;
• wherein the metric comprises a peak-to-average power ratio (PAPR) or a cubic metric.

A method for wireless communication,

• comprising:
• selecting phases for a plurality of carriers based on a metric;
• and
• applying the selected phases to data to be sent on the plurality of carriers,
• wherein the data comprise data symbols and pilot symbols, wherein multiple phases are selected for multiple spatial layers in each carrier, one phase for each spatial layer, and wherein each phase is applied to all data symbols and pilot symbols to be sent on one spatial layer in one carrier, and
• wherein the applying the selected phases to the data comprises assigning each spatial layer with a different subset of resource elements used for pilot transmission in each carrier,
• applying the phase for each spatial layer in each carrier to pilot symbols to be sent on the subset of resource elements assigned to the spatial layer for pilot transmission, and
• applying the phase for each spatial layer in each carrier to data symbols to be sent on resource elements used for data transmission in the carrier;
• wherein the metric comprises a peak-to-average power ratio (PAPR) or a cubic metric.