# US 2014/0194154 A1 · RTT Quality Improvement By Compensation Of Artifacts Introduced By AP And STA

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- Number: US 2014/0194154 A1
- Document ID: US20140194154A1
- Status: Published application
- Kind: A1
- Application number: 13/737,885
- Filed: 2013-01-09
- Published: 2014-07-10
- Earliest claimed: 2013-01-09
- Assignees: QUALCOMM Incorporated
- Applicants: Qualcomm Incorporated
- Inventors: Vinay SRIDHARA; Sina FIROUZABADI; Ayman Fawzy NAGUIB
- Web page: https://patentgrep.com/patent/US20140194154A1

## CPC

- H04W 24/02: Arrangements for optimising operational condition
- H04L 25/0202: {Channel estimation}
- 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)

## Abstract

A system and method is described herein for compensating for artifacts introduced by nodes in a wireless network. The method may include transmitting, by a first node, first characteristic information indicating the frequency response of the first node to a mobile station in the wireless network and receiving, by the first node from the mobile station, second characteristic information indicating the frequency response of a second node in the wireless network. By broadcasting the frequency response of each node in the network to each other node, the method may produce a compensated channel estimation that eliminates or reduces artifacts introduced by the nodes to wireless signals.

## Claims

### Claim 1

A method to compensate for artifacts in a wireless network, comprising:
transmitting, by a first node, first characteristic information indicating the frequency response of the first node to a mobile station in the wireless network; and
receiving, by the first node from the mobile station, second characteristic information indicating the frequency response of a second node in the wireless network.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
calculating, by the first node, an estimated frequency response of a channel between the first and second nodes.

### Claim 3 (depends on 2)

The method of claim 2, further comprising:
calculating, by the first node, a compensated frequency response of the channel between the first and second nodes based on the second characteristic information indicating the frequency response of the second node.

### Claim 4 (depends on 1)

The method of claim 1, wherein the first and second characteristic information include transfer functions for the first and second nodes, respectively.

### Claim 5 (depends on 1)

The method of claim 1, wherein the first and second characteristic information include vendor and model numbers for the first and second nodes, respectively.

### Claim 6 (depends on 1)

The method of claim 1, wherein the frequency responses of the first and second nodes are a combination of the individual frequency responses for each filter in the signal chain in each respective node.

### Claim 7 (depends on 3)

The method of claim 3, further comprising:
calculating a round trip time (RTT) for the first node based on the compensated frequency response of the channel.

### Claim 8 (depends on 3)

The method of claim 3, further comprising:
calculating a received signal strength indicator (RSSI) for the first node based on the compensated frequency response of the channel.

### Claim 9 (depends on 3)

The method of claim 3, further comprising:
detecting cyclic shift diversity (CSD) based on the compensated frequency response of the channel.

### Claim 10 (depends on 1)

The method of claim 1, wherein the second characteristic information is contained within assistance data transmitted to the first node.

### Claim 11 (depends on 1)

The method of claim 1, wherein the first node transmits the first characteristic information and receives the second characteristic information upon joining the wireless network.

### Claim 12

A non-transient machine-readable medium comprising instructions, which, when executed by a machine, cause the machine to perform operations, the instructions comprising:
transmit, by a first node, the frequency response of the first node to each node in the wireless network; and
receive, by the first node, the frequency response of each node in the wireless network.

### Claim 13 (depends on 12)

The non-transient machine-readable medium of claim 12, wherein the instructions further comprise:
calculating, by the first node, an estimated frequency response of a channel between the first and second nodes.

### Claim 14 (depends on 13)

The non-transient machine-readable medium of claim 13, wherein the instructions further comprise:
calculating, by the first node, a compensated frequency response of the channel between the first and second nodes based on the second characteristic information indicating the frequency response of the second node.

### Claim 15 (depends on 12)

The non-transient machine-readable medium of claim 12, wherein the first and second characteristic information include transfer functions for the first and second nodes, respectively.

### Claim 16 (depends on 12)

The non-transient machine-readable medium of claim 12, wherein the first and second characteristic information include vendor and model numbers for the first and second nodes, respectively.

### Claim 17 (depends on 12)

The non-transient machine-readable medium of claim 12, wherein the frequency responses of the first and second nodes are a combination of the individual frequency responses for each filter in the signal chain in each respective node.

### Claim 18 (depends on 14)

The non-transient machine-readable medium of claim 14, wherein the instructions further comprise:
calculating a round trip time (RTT) for the first node based on the compensated frequency response of the channel.

### Claim 19 (depends on 14)

The non-transient machine-readable medium of claim 14, wherein the instructions further comprise:
calculating a received signal strength indicator (RSSI) for the first node based on the compensated frequency response of the channel.

### Claim 20 (depends on 14)

The non-transient machine-readable medium of claim 14, wherein the instructions further comprise:
detecting cyclic shift diversity (CSD) based on the compensated frequency response of the channel.

### Claim 21 (depends on 12)

The non-transient machine-readable medium of claim 12, wherein the second characteristic information is contained within assistance data transmitted to the first node.

### Claim 22 (depends on 12)

The non-transient machine-readable medium of claim 12, wherein the first node transmits the first characteristic information and receives the second characteristic information upon joining the wireless network.

### Claim 23

A mobile station, comprising:
a transceiver for receiving characteristic information from a new node joining a network, wherein the characteristic information indicates the frequency response of the new node, and transmitting the frequency response to each node in the network; and
a data store for storing the received frequency response.

### Claim 24 (depends on 23)

The mobile station of claim 23, wherein the characteristic information includes a transfer function defining the frequency response for the new node.

### Claim 25 (depends on 23)

The mobile station of claim 23, wherein the characteristic information includes a vendor and model number for the new node.

### Claim 26 (depends on 25)

The mobile station of claim 25, further comprising:
a lookup table for retrieving the frequency response for the new node based on the vendor and model number.

### Claim 27 (depends on 23)

The mobile station of claim 23, wherein the frequency response of the new node is a combination of the individual frequency responses for each component in the signal chain in the new node.

### Claim 28 (depends on 23)

The mobile station of claim 23, wherein the characteristic information transmitted to each node in the network is contained within assistance data.

### Claim 29

A system for performing data communications, comprising:
a first node in a network for transmitting first characteristic information indicating the frequency response of the first node; and
a mobile station for receiving the first characteristic information and broadcasting the frequency response of a second node in the network to the first node.

### Claim 30 (depends on 29)

The system of claim 29, wherein the first node performs channel estimation on a channel connecting the first and second nodes based on the frequency response of the second node received from the mobile station.

### Claim 31 (depends on 30)

The system of claim 30, wherein the first node calculates a compensated frequency response of the channel between the first and second nodes based on the second characteristic information indicating the frequency response of the second node.

### Claim 32 (depends on 29)

The system of claim 29, wherein the first and second characteristic information include transfer functions for the first and second nodes, respectively.

### Claim 33 (depends on 29)

The system of claim 29, wherein the first and second characteristic information include vendor and model numbers for the first and second nodes, respectively.

### Claim 34 (depends on 29)

The system of claim 29, wherein the frequency responses of the first and second nodes are a combination of the individual frequency responses for each filter in the signal chain in each respective node.

### Claim 35 (depends on 31)

The system of claim 31, wherein the first node calculates a round trip time (RTT) based on the compensated frequency response of the channel.

### Claim 36 (depends on 31)

The system of claim 31, wherein the first node calculates a received signal strength indicator (RSSI) based on the compensated frequency response of the channel.

### Claim 37 (depends on 31)

The system of claim 31, wherein the first node detects cyclic shift diversity (CSD) based on the compensated frequency response of the channel.

### Claim 38 (depends on 29)

The system of claim 29, wherein the second characteristic information is contained within assistance data transmitted to the first node.

### Claim 39 (depends on 29)

The system of claim 29, wherein the first node transmits the first characteristic information and receives the second characteristic information upon joining the wireless network.

### Claim 40

A mobile node, comprising:
one or more filters for processing wireless signals; and
a transceiver for (1) transmitting first characteristic information indicating the frequency response of the one more filters to a mobile station in a network and (2) receiving second characteristic information indicating the frequency response of a remote device in the network.

### Claim 41 (depends on 40)

The mobile node of claim 40, further comprising:
a hardware processor for calculating an estimated frequency response of a channel between the mobile node and the remote device.

### Claim 42 (depends on 41)

The mobile node of claim 41, wherein the hardware processor calculates a compensated frequency response of the channel between the mobile node and the remote device based on the second characteristic information indicating the frequency response of the remote device.

### Claim 43 (depends on 40)

The mobile node of claim 40, wherein the first and second characteristic information include transfer functions for the mobile node and the remote device, respectively.

### Claim 44 (depends on 40)

The mobile node of claim 40, wherein the first and second characteristic information include vendor and model numbers for the mobile node and the remote device, respectively.

### Claim 45 (depends on 40)

The mobile node of claim 40, wherein the frequency response of the mobile node is a combination of the individual frequency responses for each filter of the one or more filters.

### Claim 46 (depends on 42)

The mobile node of claim 42, wherein the hardware processor calculates a round trip time (RTT) for the mobile node and the remote device based on the compensated frequency response of the channel.

### Claim 47 (depends on 42)

The mobile node of claim 42, wherein the hardware processor detects cyclic shift diversity (CSD) based on the compensated frequency response of the channel.

### Claim 48 (depends on 40)

The mobile node of claim 40, wherein the second characteristic information is contained within assistance data transmitted to the mobile node.

### Claim 49 (depends on 40)

The mobile node of claim 40, wherein mobile node transmits the first characteristic information and receives the second characteristic information upon joining the network.

### Claim 50

A mobile station, comprising:
a means for receiving characteristic information from a new node joining a network, wherein the characteristic information indicates the frequency response of the new node, and transmitting the frequency response to each node in the network; and
a means for storing the received frequency response.

### Claim 51 (depends on 50)

The mobile station of claim 50, wherein the characteristic information includes a transfer function defining the frequency response for the new node.

### Claim 52 (depends on 50)

The mobile station of claim 50, wherein the characteristic information includes a vendor and model number for the new node.

### Claim 53 (depends on 52)

The mobile station of claim 52, further comprising:
a means retrieving the frequency response for the new node based on the vendor and model number.

### Claim 54 (depends on 50)

The mobile station of claim 50, wherein the frequency response of the new node is a combination of the individual frequency responses for each component in the signal chain in the new node.

### Claim 55 (depends on 50)

The mobile station of claim 50, wherein the characteristic information transmitted to each node in the network is contained within assistance data.