US 11,943,038 B2
Relay beamforming with predictive relay selection for millimeter wave communications
Athina Petropulu, New Brunswick, NJ (US); Anastasios Dimas, New Brunswick, NJ (US); and Dionysios Kalogerias, New Brunswick, NJ (US)
Assigned to RUTGERS, THE STATE UNIVERSITY OF NEW JERSEY, New Brunswick, NJ (US)
Filed by Rutgers, The State University of New Jersey, New Brunswick, NJ (US)
Filed on Jun. 21, 2021, as Appl. No. 17/352,584.
Claims priority of provisional application 63/041,479, filed on Jun. 19, 2020.
Prior Publication US 2021/0399788 A1, Dec. 23, 2021
Int. Cl. H04B 7/155 (2006.01); H04B 7/06 (2006.01); H04W 84/04 (2009.01)
CPC H04B 7/15507 (2013.01) [H04B 7/0617 (2013.01); H04W 84/047 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for relay selection at each of a plurality of cooperating nodes within a millimeter wave network configured to spatially diversify a transmitted signal through all sets of consecutive, nonrepeating network segments including non-line-of-sight (NLoS) segments from a source node to a destination node, each cooperating node configured to forward a respective received signal toward the destination node via respective network segments including the NLoS segments, each cooperating node comprising a respective cluster of relays configured for beamforming in a link between the each cooperating node and the destination node, the method comprising:
at a first cooperating node of the plurality of cooperating nodes during a current time slot t, estimating first Channel State Information (CSI) associated with a currently selected relay and estimating second CSI associated with the network segments including the NLoS segments traversed by the received signal, the currently selected relay comprising a relay within the cooperating node cluster of relays;
at the first cooperating node during the current time slot t, performing beamforming by the currently selected relay using beamforming weights determined in accordance with a corresponding contribution to Signal-to-Interference+Noise Ratio (SINR) of a current time slot signal V(t) received at the destination node; and
at the first cooperating node during the current time slot t, selecting, f rom the cluster of relays of the first cooperating node, a relay for a next time slot t+1 in accordance with the second estimated CSI associated with a maximized minimum mean square error (MMSE) predictor of a SINR of a next time slot signal V(t+1) received at the destination node;
wherein each of the estimating first CSI and the estimating second CSI is made using a channel model including a correlation kernel describing a correlation within the millimeter wave network between incoming and outgoing channels at each cluster, at different locations, and during different time slots.