Techniques for determining uplink precoding matrix for a user equipment
AssigneeQUALCOMM Incorporated
InventorsYi Huang, Wei Zeng, Jay Kumar Sundararajan
Life of this patent
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Abstract
Certain aspects of the present disclosure provide techniques for determining precodings of signals transmitted in a wireless communications system. According to certain aspects, a method of wireless communication by a user equipment (UE) is provided. The method generally includes receiving a precoded reference signal (RS) from a base station (BS), determining a first precoding used by the BS to transmit the RS, and determining, based on the first precoding, a second precoding for use by the UE to transmit a signal to the BS.
Claims19
A method for wireless communications by a user equipment (UE), comprising:
- receiving a precoded reference signal (RS) from a base station (BS);
- determining, by the UE, a first precoding used by the BS to transmit the RS;
- calculating an effective channel based on the first precoding;
- determining, by the UE, a second precoding based on the effective channel;
- and
- transmitting a signal to the BS using the second precoding.
A method for wireless communications by a base station (BS), comprising:
- receiving a sounding reference signal (SRS) from a user equipment (UE);
- estimating a channel based on the SRS;
- estimating a noise covariance matrix based on the estimated channel;
- calculating, based on the noise covariance matrix, a first precoding to convey using a reference signal (RS), to the UE, wherein from the first precoding, the UE determines a second precoding as a function of the first precoding for use by the UE to transmit an uplink (UL) signal to the BS;
- and
- transmitting the reference signal (RS) to the UE using the first precoding.
An apparatus for wireless communications, comprising:
- means for receiving a precoded reference signal (RS) from a base station (BS);
- means for determining, by the apparatus, a first precoding used by the BS to transmit the RS;
- means for calculating an effective channel based on the first precoding;
- means for determining, by the apparatus, a second precoding based on the effective channel;
- and
- means for transmitting a signal to the BS using the second precoding.
A method for wireless communications by a user equipment (UE), comprising:
- receiving a precoded reference signal (RS) from a base station (BS);
- estimating a channel based on the RS;
- determining a first precoding used by the BS to transmit the RS;
- calculating an effective channel based on the estimated channel and the first precoding;
- performing matrix decomposition based on the effective channel;
- determining a second precoding based on the matrix decomposition;
- and
- transmitting a signal to the BS using the second precoding.
Dependencies are inferred from the claim text.