Method and apparatus for generating reference signal in analog/digital mixed bf system
AssigneeSamsung Electronics Co., Ltd.
InventorsTae-Young Kim, Shuangfeng Han, Jeong-Ho Park
Life of this patent
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Abstract
A millimeter radio wave communication system. In a method for operating a base station (BS) in an analog/digital mixed BF system, an analog BF direction is determined. A digital BF precoder is determined for the determined analog BF direction. Digital BF precoding is performed using the digital BF precoder with respect to the determined analog BF direction. A DownLink Reference Signal (DL RS) is transmitted in the analog BF direction on which the digital BF precoding has been performed.
Claims20
A method for operating a base station (BS) in an analog/digital mixed BF system, the method comprising:
- determining an analog beamforming (BF) direction;
- determining a digital BF precoder for the determined analog BF direction;
- performing digital BF precoding using the digital BF precoder with respect to the determined analog BF direction;
- and
- transmitting a DownLink Reference Signal (DL RS) in the analog BF direction on which the digital BF precoding has been performed.
A method for operating a mobile station (MS) in an analog/digital mixed beamforming (BF) system, the method comprising:
- receiving a downlink reference signal (DL RS) transmitted by a base station (BS);
- selecting a precoder from the DL RS;
- and
- feeding back information regarding the selected precoder to the BS.
An apparatus of a base station (BS) in an analog/digital mixed beamforming (BF) system, the apparatus comprising:
- a controller configured to determine an analog BF direction, determine a digital BF precoder for the determined analog BF direction, perform digital BF precoding using the digital BF precoder on the determined analog BF direction, and generate a downlink reference signal (DL RS) directed to the analog BF direction on which the digital BF precoding has been performed;
- a transmitter configured to transmit the DL RS;
- a plurality of antennas comprising a plurality of antenna elements;
- and
- a plurality of Radio Frequency (RF) chains connected to the antenna elements, the RF chains configured to form a beam to the analog beam direction determined by the controller and transmit the DL RS.
An apparatus of a mobile station (MS) in an analog/digital mixed beamforming (BF) system, the apparatus comprising:
- a receiver configured to receive a downlink reference signal (DL RS) from a base station (BS);
- a transmitter configured to feed back information regarding a precoder to the BS;
- a channel estimator configured to estimate a channel depending on a DL beam direction using the DL RS;
- and
- a controller configured to select the precoder from the DL RS with consideration of channel information depending on the DL beam direction.
Dependencies are inferred from the claim text.