# US 10,772,159 B2 · Channel estimation for coordinated access point transmissions in wireless networks

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- Number: US 10,772,159 B2
- Document ID: US10772159B2
- Status: Granted
- Kind: B2
- Application number: 15/394,353
- Filed: 2016-12-29
- Published: 2018-07-05
- Granted: 2020-09-08
- Earliest claimed: 2016-12-29
- Assignees: Intel Corporation
- Applicants: Intel Corporation
- Inventors: Shahrnaz Azizi; Thomas J. Kenney; Roya Doostnejad; Juan Fang
- Web page: https://patentgrep.com/patent/US10772159B2

## CPC

- H04W 88/12: Access point controller devices
- H04L 5/0035: {Resource allocation in a cooperative multipoint environment}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 25/0226: {sounding signals per se}
- H04J 11/0053: {using co-ordinated multipoint transmission/reception (co-ordinated antenna or beam-forming aspects H04B7/022)}
- H04L 5/0023: {Time-frequency-space}
- H04L 25/0204: {of multiple channels}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)

## Abstract

This disclosure describes systems, methods, and devices related to channel estimation for coordinated access point (AP) transmissions. A device may identify of one or more access points associated with a coordinated basic service set. The device may determine to transmit one or more packets to a station device in coordination with the one or more access points. The device may determine one or more first training fields associated with one or more antennas of the device. The device may cause to send the one or more first training fields to the station device on one or more first communication links between the device and the station device.

## Claims

### Claim 1

A station device, the station device comprising: memory and processing circuitry, configured to:
identify one or more first training fields received from one or more antennas of a first access point and one or more second antennas of a second access point during a first time period;
identify one or more second training fields received from the one or more antennas and the one or more second antennas during a second time period, wherein the first access point and second access point are associated with a channel matrix maintained by the station device, the channel matrix comprising a first link corresponding to the first access point and a second link corresponding to the second access point;
determine the one or more first training fields and the one or more second training fields are based at least in part on an orthogonal matrix and one or more cyclic shifts; and
determine one or more first channel estimations associated with the one or more antennas, and one or more second channel estimations based at least in part on the one or more first training fields and the one or more second training fields.

### Claim 2 (depends on 1)

The station device of claim 1, wherein each of the one or more first training fields is multiplied by a corresponding element of the orthogonal matrix.

### Claim 3 (depends on 1)

The station device of claim 1, wherein the one or more first training fields comprise one or more first training sequences, and wherein the one or more second training fields comprise one or more second training sequences.

### Claim 4 (depends on 3)

The station device of claim 3, wherein the one or more first training sequences and the one or more second training sequences are interleaved in frequency domain.

### Claim 5 (depends on 1)

The station device of claim 1, wherein a first training field of the one or more first training fields comprises a first cyclic shift and a second training field of the one or more first training fields comprises a second cyclic shift.

### Claim 6 (depends on 1)

The station device of claim 1, wherein the first access point and the second access point are connected to a controller device that coordinates packet exchanges between the first access point, the second access point, and the device.