IP Library › Granted Patent US 12,341,582
Granted Patent B2
US 12,341,582 · App. 17/667,230 · Granted Jun 24, 2025

Systems and methods for mitigating interference within actively used spectrum

Inventors: Stephen G. Perlman (Palo Alto, CA); Antonio Forenza (San Francisco, CA); Mario Di Dio (San Francisco, CA); Fadi Saibi (San Francisco, CA)
Assignee: Rearden, LLC
H04B7/0456H04B7/0626H04B15/00H04L5/14Y02D30/70
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Quick Facts
Patent No.
US 12,341,582
App. No.
17/667,230
Granted
Jun 24, 2025
Kind
B2
Abstract

Systems and methods are described to mitigate interference to out of band receivers using out of band training signals.

Claims (17)

1. A ground-based wireless transceiver station configured to create a plurality of concurrent and independent orthogonal frequency-division multiplexing (“OFDM”) wireless links between the ground-based wireless transceiver station and a plurality of user devices within a same frequency band, the plurality of wireless links formed over multipath downlink or uplink channels;

wherein the ground-based wireless transceiver station comprises one or more computer processors that carry out instructions embodied in a non-transitory computer readable medium so that the ground-based wireless transceiver station is configured to create the plurality of concurrent and independent OFDM wireless links using a plurality of ground-based wireless transceiver station antennas equal to more than ten times a number of antennas configured to communicate over at least one of the uplink channels of the plurality of concurrent and independent OFDM wireless links of at least one user device;

wherein the ground-based wireless transceiver station is configured to create at least one of the plurality of concurrent and independent OFDM wireless links with at least one user device's antennas in or on an aircraft flying over the ground-based wireless transceiver station and at least one of the plurality of concurrent and independent OFDM wireless links with at least one ground-based user device's antennas; and

wherein the ground-based wireless transceiver station is configured to exploit channel reciprocity by estimating an uplink channel state information (CSI) between the plurality of ground-based wireless transceiver station antennas the at least one user device's antennas or the at least one ground-based user device's antennas and using it to derive a downlink CSI.

2. The ground-based wireless transceiver station as in claim 1 wherein the ground-based wireless transceiver station is configured to estimate a CSI between the plurality of antennas on the ground-based wireless transceiver station and the at least one user device's antennas or the at least one ground-based user device's antennas by using pilot tones, channel sounding or training signals.

3. The ground-based wireless transceiver station as in claim 1 wherein the ground-based wireless transceiver station is configured to estimate a CSI between the plurality of antennas on the ground-based wireless transceiver station and the at least one user device's antennas or the at least one ground-based user device's antennas by training signals that are orthogonal.

4. The ground-based wireless transceiver station as in claim 1 wherein the ground-based wireless transceiver station is configured to store a CSI estimate between the plurality of antennas on the ground-based wireless transceiver station and the at least one user device's antennas or the at least one ground-based user device's antennas in a channel characterization matrix.

5. The ground-based wireless transceiver station as in claim 1 wherein the ground-based wireless transceiver station is configured to store a CSI estimate between the plurality of antennas on the ground-based wireless transceiver station and the at least one user device's antennas or the at least one ground-based user device's antennas in a channel characterization matrix comprised of phase and amplitude of an uplink channel corresponding to the stored CSI estimate.

6. The ground-based wireless transceiver station as in claim 1 wherein the ground-based wireless transceiver station is configured to direct the plurality of user devices to transmit training signals.

7. The ground-based wireless transceiver station as in claim 1 wherein the ground-based wireless transceiver station is configured to direct the plurality of user devices to transmit training signals that are synchronized.

8. The ground-based wireless transceiver station as in claim 1 wherein the ground-based wireless transceiver station is configured to update a CSI estimate between the plurality of antennas on the ground-based wireless transceiver station and the at least one user device's antennas or the at least one ground-based user device's antennas continually or periodically.

9. The ground-based wireless transceiver station as in claim 1 wherein the ground-based wireless transceiver station is configured to update a CSI estimate between the plurality of antennas on the ground-based wireless transceiver station and the at least one user device's antennas or the at least one ground-based user device's antennas as the at least one user device moves from one location to another.

10. The ground-based wireless transceiver station as in claim 1 wherein the ground-based wireless transceiver station is configured to create the plurality of concurrent and independent OFDM wireless links via precoding based on a plurality of CSI estimates between the plurality of antennas on the ground-based wireless transceiver station and the at least one user device's antennas or the at least one ground-based user device's antennas.

11. The ground-based wireless transceiver station as in claim 1 wherein the ground-based wireless transceiver station is configured to divide the plurality of user devices into groups.

12. The ground-based wireless transceiver station as in claim 1 wherein the ground-based wireless transceiver station is configured to divide the plurality of user devices into groups and schedule different groups of users by cycling between groups.

13. The ground-based wireless transceiver station as in claim 1 wherein the ground-based wireless transceiver station is configured to divide the plurality of user devices into groups and assign the same or different levels of bandwidth to the user devices.

14. The ground-based wireless transceiver station as in claim 1 wherein the ground-based wireless transceiver station is configured to divide the plurality of user devices into groups and schedule different groups based on relative proximity between the plurality of user devices.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 21, 2025
From: PERLMAN, STEPHEN G.; FORENZA, ANTONIO; DI DIO, MARIO; SAIBI, FADI
To: REARDEN, LLC
Reel/Frame 071183/0780 →
Continuity (6)
Continuation 17361252 · Jun 28, 2021
Continuation 15682076 · Aug 21, 2017
Continuation In Part 14672014 · Mar 27, 2015
Provisional Application 62380126 · Aug 26, 2016
Provisional Application 61980479 · Apr 16, 2014
Related Publication 20220166474A1 · May 26, 2022
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