Direction-controlled PAPR reduction
AssigneeQUALCOMM Incorporated
InventorsJunyi Li, Juergen Cezanne, Guy Wolf, Assaf Touboul, Noam Zach, Ory Eger
Life of this patent
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Abstract
A direction-controlled PAPR reduction is provided in which a base station transmits a PAPR reduction signal using a subset of antenna beams selected from a null space plurality of antenna beams. The subset of antenna beams is selected such that the PAPR reduction signal is not directed having a relatively-high path gain to a UE and/or so that the PAPR reduction signal power is concentrated in directions that have a relatively-lo path gain to the UE.
Claims31
A method of wireless communication for a base station, comprising:
- transmitting a message through a channel to a first user equipment (UE) using a first antenna beam;
- transmitting a first reference signal using a second antenna beam, the second antenna beam being part of a null-space plurality of antenna beams that are projected into a null space for the channel;
- receiving a first reference signal report from the first UE responsive to the transmission of the first reference signal;
- and
- transmitting a peak-to-average-power (PAPR) reduction signal using a direction-controlled PAPR subset of antenna beams selected from the null space plurality of antenna beams responsive to the first reference signal report to reduce a PAPR for the message.
A base station, comprising:
- a transceiver;
- and
- a processor configured to:
- command the transceiver to transmit a message through a channel to a first user equipment (UE) using a first antenna beam;
- command the transceiver to transmit a first reference signal using a second antenna beam, the second antenna beam being part of a null-space plurality of antenna beams that are projected into a null space for the channel;
- process a first reference signal report from the first UE responsive to the transmission of the first reference signal;
- and
- command the transceiver to transmit a peak-to-average-power (PAPR) reduction signal using a direction-controlled PAPR subset of antenna beams selected from the null-space plurality of antenna beams responsive to the processing of the first reference signal report.
A method of wireless communication for a user equipment (UE), comprising:
- receiving a first reference signal over a first serving antenna beam from a base station;
- receiving a second reference signal over a second antenna beam from the base station;
- selecting a first precoding matrix responsive to a processing of the first reference signal;
- selecting a second precoding matrix responsive to a processing of the second reference signal;
- transmitting a reference signal report to the base station that identifies the first precoding matrix and the second precoding matrix;
- and
- receiving a message from the base station over the first serving beam having an increased peak-to-power ratio (PAPR) responsive to the transmission of the reference signal report.
A user equipment, comprising:
- a transceiver configured to receive a first reference signal over a serving antenna beam from a base station and configured to receive a second reference signal over a null-space antenna beam from the base station, and
- a processor configured to select a first precoding matrix responsive to a processing of the first reference signal and to select a second precoding matrix responsive to a processing of the second reference signal, the processor being further configured to command the transceiver to transmit a reference signal report to the base station that identifies the first precoding matrix and the second precoding matrix, wherein the transceiver is further configured to receive a message over the serving antenna beam from the base station having an increased peak-to-average power ratio (PAPR) responsive to the transmission of the reference signal report.
Dependencies are inferred from the claim text.