METHOD AND APPARATUS FOR GENERATING REFERENCE SIGNAL IN ANALOG/DIGITAL MIXED BF SYSTEM
First Claim
Patent Images
1. 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.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
20 Claims
-
1. 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. - View Dependent Claims (2, 3, 4, 5)
-
-
6. 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. - View Dependent Claims (7, 8, 9, 10)
-
-
11. 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. - View Dependent Claims (12, 13, 14, 15)
-
-
16. 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. - View Dependent Claims (17, 18, 19, 20)
-
Specification