公开(公告)号：US20190028155A1

公开(公告)日：2019-01-24

申请号：US16036372

申请日：2018-07-16

申请人： National Instruments Corporation

发明人： Jörg Hofrichter ,  Michael Löhning ,  Eckhard Ohlmer

IPC分类号： H04B7/0417 ,  H04B1/40 ,  H04L1/00 ,  H01Q1/24

摘要： In a wireless transceiver station having M antennas, designate an antenna as a target reference antenna (TRA) and for each antenna m other than the TRA: define N distinct paths from antenna m to TRA through zero or more intermediate reference antennas, N is two or more, each distinct paths has a distinct associated set of one or more antenna pairs; for each antenna pair of the sets, estimate an effective forward and backward channel response by sending calibration pilots forth and back between the antenna pair and calculate a reciprocity coefficient for the antenna pair using the estimated channel responses; for each of the N distinct paths, calculate a reciprocity coefficient estimate using the reciprocity coefficients calculated for the set of antenna pairs associated with the path; and combine the N calculated reciprocity coefficient estimates to produce a final reciprocity coefficient estimate for antenna pair (m, target reference antenna).

公开(公告)号：US10312978B2

公开(公告)日：2019-06-04

申请号：US16036372

申请日：2018-07-16

申请人： National Instruments Corporation

发明人： Jörg Hofrichter ,  Michael Löhning ,  Eckhard Ohlmer

IPC分类号： H04W52/08 ,  H04B7/0417 ,  H01Q1/24 ,  H04L1/00 ,  H04B1/40

摘要： In a wireless transceiver station having M antennas, designate an antenna as a target reference antenna (TRA) and for each antenna m other than the TRA: define N distinct paths from antenna m to TRA through zero or more intermediate reference antennas, N is two or more, each distinct paths has a distinct associated set of one or more antenna pairs; for each antenna pair of the sets, estimate an effective forward and backward channel response by sending calibration pilots forth and back between the antenna pair and calculate a reciprocity coefficient for the antenna pair using the estimated channel responses; for each of the N distinct paths, calculate a reciprocity coefficient estimate using the reciprocity coefficients calculated for the set of antenna pairs associated with the path; and combine the N calculated reciprocity coefficient estimates to produce a final reciprocity coefficient estimate for antenna pair (m, target reference antenna).