Wireless transceiver station with performs multi-path reciprocity calibration with multiple reference antennas
First Claim
1. A wireless transceiver station, comprising:
- M antennas connected to radio transceivers; and
a processor, programmed to;
designate an antenna of the M antennas as a target reference antenna; and
for each antenna m of the M antennas other than the target reference antenna;
define N distinct paths from the antenna m to the target reference antenna through zero or more intermediate reference antennas of the M antennas, wherein N for the antenna m is two or more;
wherein each of the N distinct paths has a distinct associated set of one or more antenna pairs of the M antennas;
for each antenna pair of the sets of antenna pairs;
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 path 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).
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Accused Products
Abstract
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).
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Citations
20 Claims
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1. A wireless transceiver station, comprising:
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M antennas connected to radio transceivers; and a processor, programmed to; designate an antenna of the M antennas as a target reference antenna; and for each antenna m of the M antennas other than the target reference antenna; define N distinct paths from the antenna m to the target reference antenna through zero or more intermediate reference antennas of the M antennas, wherein N for the antenna m is two or more; wherein each of the N distinct paths has a distinct associated set of one or more antenna pairs of the M antennas; for each antenna pair of the sets of antenna pairs; 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 path 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). - View Dependent Claims (2, 3, 4, 5)
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6. A wireless transceiver station, comprising:
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M antennas connected to radio transceivers; and a processor, programmed to; designate an antenna of the M antennas as a target reference antenna; designate a subset of R antennas of the M antennas as reference antennas, where the target reference antenna is included in the subset, where R is at least two; for each antenna m of the M antennas other than the target reference antenna; define N distinct paths from the antenna m to the target reference antenna through zero or more of P distinct pairs of antennas (rr, rl) of the subset of R reference antennas, where P is at least one, where N for the antenna m is two or more; for at least each antenna pair (m, r) included in the N distinct paths for the M antennas; estimate an effective forward and backward channel response by sending calibration pilots forth and back between the antenna pair (m, r); and calculate a single-hop reciprocity coefficient estimate for the antenna pair (m, r) using the estimated effective forward and backward channel responses for the antenna pair (m, r); for each antenna pair (rr, rl) of the P distinct pairs of antennas (rr, rl) of the subset of R reference antennas; calculate one or more dual-hop reciprocity coefficient estimates for the antenna pair (rr, rl) through respective one or more antennas of the M antennas, where each respective antenna is distinct from rr and rl; and combine the single-hop reciprocity calibration coefficient estimate for the antenna pair (rr, rl) and the one or more dual-hop reciprocity calibration coefficient estimates for the antenna pair (rr, rl) to generate a combined reciprocity calibration coefficient estimate for the antenna pair (rr, rl); and for each antenna m of the M antennas; for each path of the N distinct paths for the antenna m, calculate a respective reciprocity coefficient estimate using; the combined reciprocity calibration coefficient estimates for each of the antenna pairs (rr, rl) included in the path; and the single-hop reciprocity coefficient estimate for the antenna pair (m, r), where antenna r is one of the antennas in antenna pair (rr, rl) included in the path; and combine the N respective reciprocity coefficient estimates to produce a final reciprocity coefficient estimate for antenna pair (m, target reference antenna). - View Dependent Claims (7, 8)
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9. A method, comprising:
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designating an antenna of M antennas of a wireless transceiver station as a target reference antenna; and for each antenna m of the M antennas other than the target reference antenna; defining N distinct paths from the antenna m to the target reference antenna through zero or more intermediate reference antennas of the M antennas, wherein N for the antenna m is two or more; wherein each of the N distinct paths has a distinct associated set of one or more antenna pairs of the M antennas; for each antenna pair of the sets of antenna pairs; estimating an effective forward and backward channel response by sending calibration pilots forth and back between the antenna pair; and calculating a reciprocity coefficient for the antenna pair using the estimated channel responses; for each path of the N distinct paths; calculating a reciprocity coefficient estimate using the reciprocity coefficients calculated for the set of antenna pairs associated with the path; and combining the N calculated reciprocity coefficient estimates to produce a final reciprocity coefficient estimate for antenna pair (m, target reference antenna). - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A method, comprising:
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designating one antenna of the M antennas as a target reference antenna; designating a subset of R antennas of the M antennas as reference antennas, where the target reference antenna is included in the subset, where R is at least two; for each antenna m of the M antennas other than the target reference antenna; defining N distinct paths from the antenna m to the target reference antenna through zero or more of P distinct pairs of antennas (rr, rl) of the subset of R reference antennas, where P is at least one, where N for the antenna m is two or more; for at least each antenna pair (m, r) included in the N distinct paths for the M antennas; estimating an effective forward and backward channel response by sending calibration pilots forth and back between the antenna pair (m, r); and calculating a single-hop reciprocity coefficient estimate for the antenna pair (m, r) using the estimated effective forward and backward channel responses for the antenna pair (m, r); for each antenna pair (rr, rl) of the P distinct pairs of antennas (rr, rl) of the subset of R reference antennas; calculating one or more dual-hop reciprocity coefficient estimates for the antenna pair (rr, rl) through respective one or more antennas of the M antennas, where each respective antenna is distinct from rr and rl; and combining the single-hop reciprocity calibration coefficient estimate for the antenna pair (rr, rl) and the one or more dual-hop reciprocity calibration coefficient estimates for the antenna pair (rr, rl) to generate a combined reciprocity calibration coefficient estimate for the antenna pair (rr, rl); and for each antenna m of the M antennas; for each path of the N distinct paths for the antenna m, calculating a respective reciprocity coefficient estimate using; the combined reciprocity calibration coefficient estimates for each of the antenna pairs (rr, rl) included in the path; and the single-hop reciprocity coefficient estimate for the antenna pair (m, r), where antenna r is one of the antennas in antenna pair (rr, rl) included in the path; and combining the N respective reciprocity coefficient estimates to produce a final reciprocity coefficient estimate for antenna pair (m, target reference antenna). - View Dependent Claims (19, 20)
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Specification