# US 2019/0379568 A1 · Short training field (STF) within wireless communications

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- Number: US 2019/0379568 A1
- Document ID: US20190379568A1
- Status: Published application
- Kind: A1
- Application number: 16/546,825
- Filed: 2019-08-21
- Published: 2019-12-12
- Earliest claimed: 2015-03-04
- Assignees: Avago Technologies International Sales Pte. Limited
- Applicants: Avago Technologies International Sales Ptd. Limited
- Inventors: Ron Porat; Leo Montreuil
- Web page: https://patentgrep.com/patent/US20190379568A1

## CPC

- H04L 27/26132: {using repetition}
- H04L 1/00: Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)}
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 27/2656: {Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation}
- H04W 40/02: Communication route or path selection, e.g. power-based or shortest path routing
- H04W 72/044: based on the type of the allocated resource
- H04L 1/0025: {Transmission of mode-switching indication}
- H04L 1/0072: {Error control for data other than payload data, e.g. control data}
- H04L 1/0075: {Transmission of coding parameters to receiver (H04L1/0023 takes precedence)}
- H04L 25/0224: {using sounding signals}
- Y02D 30/70: in wireless communication networks
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A wireless communication device (alternatively, device) includes a processor configured to support communications with other wireless communication device(s) and to generate and process signals for such communications. In some examples, the device includes a communication interface and a processor, among other possible circuitries, components, elements, etc. to support communications with other wireless communication device(s) and to generate and process signals for such communications. Short training field (STF) sequences are designed using a base binary sequence. One STF includes the base binary sequence mapped. Another STF includes the base binary sequence followed by 0 followed by a phased rotated version of the base binary sequence. Another STF includes the base binary sequence followed by 0 followed by an inverted version of the base binary sequence.

## Claims

### Claim 1

A wireless communication device comprising:
a communication interface; and
processing circuitry that is coupled to the communication interface, wherein at least one of the communication interface or the processing circuitry configured to:
generate a first orthogonal frequency division multiple access (OFDMA) packet for transmission via a first communication channel, wherein the OFDMA packet includes a short training field (STF) that includes a base binary sequence mapped onto a plurality of OFDMA sub-carriers based on a predetermined spacing pattern, wherein the base binary sequence includes values of +1 and −1;
generate a second OFDMA packet for transmission via a second communication channel, wherein the second OFDMA packet includes a second STF that includes the base binary sequence followed by 0, followed by a phased rotated version of the base binary sequence;
transmit the OFDMA packet to a first other wireless communication device via the first communication channel; and
transmit the second OFDMA packet to at least one of the first other wireless communication device or a second other wireless communication device via the second communication channel.

### Claim 2 (depends on 1)

The wireless communication device of claim 1, wherein the at least one of the communication interface or the processing circuitry is further configured to:
generate a third OFDMA packet for transmission via a third communication channel, wherein the third OFDMA packet includes a third STF that includes the base binary sequence followed by 0 followed by an inverted version of the base binary sequence; and
transmit the third OFDMA packet to at least one of the first other wireless communication device, the second other wireless communication device, or a third wireless communication device.

### Claim 3 (depends on 1)

The wireless communication device of claim 1, wherein:
the first communication channel includes a 20 MHz communication channel; and
the second communication channel includes a 40 MHz communication channel.

### Claim 4 (depends on 3)

The wireless communication device of claim 3, wherein:
the 20 MHz communication channel includes a first periodicity or a second periodicity.

### Claim 5 (depends on 3)

The wireless communication device of claim 3, wherein:
the 20 MHz communication channel includes a first periodicity of 0.8 μsec or a second periodicity of 1.6 μsec.

### Claim 6 (depends on 1)

The wireless communication device of claim 1, wherein the at least one of the communication interface or the processing circuitry is further configured to:
rotate the STF by 45 degrees when generating the first OFDMA packet; and
rotate the second STF by 45 degrees when generating the second OFDMA packet, wherein the predetermined spacing pattern specifies a sub-carrier spacing of 16 for elements of the base binary sequence mapped onto the plurality of OFDMA sub-carriers with indices ranging from −112 to +112.

### Claim 7 (depends on 1)

The wireless communication device of claim 1 further comprising:
an access point (AP), wherein the first or second wireless communication device includes a wireless station (STA).

### Claim 8 (depends on 1)

The wireless communication device of claim 1 further comprising:
a wireless station (STA), wherein the first or second wireless communication device includes an access point (AP).

### Claim 9

A wireless communication device comprising:
a communication interface; and
processing circuitry that is coupled to the communication interface, wherein at least one of the communication interface or the processing circuitry configured to:
generate a first orthogonal frequency division multiple access (OFDMA) packet for transmission via a first communication channel, wherein the OFDMA packet includes a short training field (STF) that includes a base binary sequence mapped onto a plurality of OFDMA sub-carriers based on a predetermined spacing pattern, wherein the base binary sequence includes values of +1 and −1;
generate a second OFDMA packet for transmission via a second communication channel, wherein the second OFDMA packet includes a second STF that includes the base binary sequence followed by 0 followed by a phased rotated version of the base binary sequence;
generate a third OFDMA packet for transmission via a third communication channel, wherein the third OFDMA packet includes a third STF that includes the base binary sequence followed by 0 followed by an inverted version of the base binary sequence;
transmit the OFDMA packet to a first other wireless communication device via the first communication channel; and
transmit the second OFDMA packet to at least one of the first other wireless communication device or a second other wireless communication device via the second communication channel; and
transmit the third OFDMA packet to at least one of the first other wireless communication device, the second other wireless communication device, or a third other wireless communication device.

### Claim 10 (depends on 9)

The wireless communication device of claim 9, wherein the at least one of the communication interface or the processing circuitry is further configured to:
generate another OFDMA packet for transmission via another communication channel, wherein the another OFDMA packet includes another STF that includes the base binary sequence mapped onto the plurality of OFDMA sub-carriers based on the predetermined spacing pattern; and
transmit the another OFDMA packet to at least one of another wireless communication device that includes a first other wireless communication device, the second other wireless communication device or the third wireless communication device via the another communication channel.

### Claim 11 (depends on 9)

The wireless communication device of claim 9, wherein:
the second communication channel includes a 20 MHz communication channel; and
the first communication channel includes a 40 MHz communication channel.

### Claim 12 (depends on 11)

The wireless communication device of claim 11, wherein:
the 20 MHz communication channel includes a first periodicity or a second periodicity.

### Claim 13 (depends on 11)

The wireless communication device of claim 11, wherein:
the 20 MHz communication channel includes a first periodicity of 0.8 μsec or a second periodicity of 1.6 μsec.

### Claim 14 (depends on 9)

The wireless communication device of claim 9, wherein the at least one of the communication interface or the processing circuitry is further configured to:
rotate the STF by 45 degrees when generating the first OFDMA packet; and
rotate the second STF by 45 degrees when generating the second OFDMA packet, wherein the predetermined spacing pattern specifies a sub-carrier spacing of 16 for elements of the base binary sequence mapped onto the plurality of OFDMA sub-carriers with indices ranging from −112 to +112.

### Claim 15 (depends on 9)

The wireless communication device of claim 9 further comprising:
a wireless station (STA), wherein the first, second or third other wireless communication device includes an access point (AP) or another STA.

### Claim 16

A method for execution by a wireless communication device, the method comprising:
generating a first orthogonal frequency division multiple access (OFDMA) packet for transmission via a first communication channel, wherein the OFDMA packet includes a short training field (STF) that includes a base binary sequence mapped onto a plurality of OFDMA sub-carriers based on a predetermined spacing pattern, wherein the base binary sequence includes values of +1 and −1;
generating a second OFDMA packet for transmission via a second communication channel, wherein the second OFDMA packet includes a second STF that includes the base binary sequence followed by 0, followed by a phased rotated version of the base binary sequence;
transmitting the OFDMA packet to a first other wireless communication device via the first communication channel; and
transmitting the second OFDMA packet to at least one of the first other wireless communication device or a second other wireless communication device via the second communication channel.

### Claim 17 (depends on 16)

The method of claim 16 further comprising:
generating a third OFDMA packet for transmission via a third communication channel, wherein the third OFDMA packet includes a third STF that includes the base binary sequence followed by 0 followed by an inverted version of the base binary sequence; and
transmitting the third OFDMA packet to at least one of the first other wireless communication device, the second other wireless communication device, or a third wireless communication device.

### Claim 18 (depends on 16)

The method of claim 16, wherein:
the first communication channel includes a 20 MHz communication channel; and
the second or third communication channels include a 40 MHz communication channel.

### Claim 19 (depends on 18)

The method of claim 18, wherein:
the 20 MHz communication channel includes a first periodicity or a second periodicity.

### Claim 20 (depends on 16)

The method of claim 16 further comprising:
rotate the STF by 45 degrees when generating the first OFDMA packet; and
rotate the second STF by 45 degrees when generating the second OFDMA packet, wherein the predetermined spacing pattern specifies a sub-carrier spacing of 16 for elements of the base binary sequence mapped onto the plurality of OFDMA sub-carriers with indices ranging from −112 to +112.