US 9,814,037 B2
Method for efficient channel estimation and beamforming in FDD system by exploiting uplink-downlink correspondence
Feng Xue, Redwood City, CA (US); Qinghua Li, San Ramon, CA (US); and Yuan Zhu, Beijing (CN)
Assigned to Intel Corporation, Santa Clara, CA (US)
Filed by Intel Corporation, Santa Clara, CA (US)
Filed on Dec. 17, 2013, as Appl. No. 14/109,211.
Claims priority of provisional application 61/841,230, filed on Jun. 28, 2013.
Prior Publication US 2015/0003338 A1, Jan. 1, 2015
Int. Cl. H04B 7/00 (2006.01); H04W 72/04 (2009.01); H04W 76/02 (2009.01); H04B 7/0452 (2017.01); H04B 7/06 (2006.01); H04W 56/00 (2009.01); H04W 72/02 (2009.01); H04L 25/02 (2006.01); H04L 25/03 (2006.01); H04W 88/02 (2009.01); H04W 16/14 (2009.01); H04W 8/00 (2009.01); H04W 48/16 (2009.01); H04L 12/18 (2006.01); H04W 74/00 (2009.01); H04W 74/08 (2009.01); H04W 36/02 (2009.01); H04W 68/04 (2009.01); H04W 76/06 (2009.01); H04B 7/024 (2017.01); H04J 11/00 (2006.01); H04L 5/14 (2006.01); H04W 84/18 (2009.01); H04W 88/06 (2009.01); H04W 84/04 (2009.01); H04W 48/12 (2009.01)
CPC H04W 72/0446 (2013.01) [H04B 7/024 (2013.01); H04B 7/0452 (2013.01); H04B 7/0626 (2013.01); H04J 11/005 (2013.01); H04L 5/1469 (2013.01); H04L 12/18 (2013.01); H04L 25/021 (2013.01); H04L 25/0242 (2013.01); H04L 25/03891 (2013.01); H04W 8/005 (2013.01); H04W 16/14 (2013.01); H04W 36/02 (2013.01); H04W 48/16 (2013.01); H04W 56/0005 (2013.01); H04W 68/04 (2013.01); H04W 72/02 (2013.01); H04W 72/042 (2013.01); H04W 74/004 (2013.01); H04W 74/006 (2013.01); H04W 74/0816 (2013.01); H04W 76/02 (2013.01); H04W 76/028 (2013.01); H04W 76/06 (2013.01); H04W 88/02 (2013.01); H04W 48/12 (2013.01); H04W 72/0406 (2013.01); H04W 84/045 (2013.01); H04W 84/18 (2013.01); H04W 88/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for selecting at least one parameter for downlink data transmission with a mobile user equipment, the method executable by a single wireless communication base station having multiple antennas configured to communicate wirelessly with the mobile user equipment, the method comprising:
receiving an uplink probing signal from the mobile user equipment;
determining, from the received uplink probing signal, a plurality of angles-of-arrival for a corresponding plurality of paths between the mobile user equipment and the multiple antennas of the single wireless communication base station, wherein each of the angles-of-arrival is associated with a corresponding one of the plurality of paths between the mobile user equipment and the single wireless communication base station, and each angle-of-arrival is determined based on projecting the received uplink probing signal towards a spatial signature of the corresponding one of the plurality of paths;
transmitting, from the multiple antennas, a plurality of downlink probing signals, each downlink probing signal being transmitted directionally toward a corresponding one of the angles-of-arrival, each downlink probing signal being a virtual antenna port with respect to the mobile user equipment, each virtual antenna port formed by a discrete Fourier transform (DFT) vector;
receiving, from the mobile user equipment, channel state information corresponding to a channel associated with one of the downlink probing signals; and
composing, in response to the received channel state information, a rank indicator (RI) and a preceding matrix indicator (PMI) for downlink data transmission to the mobile user equipment.