Preamble design within wireless communications

• US 10,263,678 B2
• Filed: 08/28/2017
• Issued: 04/16/2019
• Est. Priority Date: 04/24/2011
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Inventors: Porat, Ron
• Primary Examiner(s): Qureshi, Afsar M
• Application Number:
  US15/688,773
• Publication Number:
  US 20180006693A1
• Time in Patent Office: 596 Days
• CPC Class Codes: H04B 7/06 at the transmitting station
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04L 27/26136 Pilot sequence conveying additional information
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 88/08 Access point devices

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. The device is configured to generate OFDM/A packets having certain characteristics based on different packet formats. For example, a first OFDM/A packet has first characteristic(s) based on a first packet format, a second OFDM/A packet has second characteristic(s) based on a second packet format, and so on. A receiver device is configured to process such OFDM/A packets to determine characteristic(s) thereof to determine, identify, classify, etc. their respective packet formats so that the OFDM/A packets can be properly and appropriately processed based on their particular packet formats.

Claims

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;

receive an orthogonal frequency division multiplexing (OFDM) packet from another wireless communication device, wherein the OFDM packet includes a preamble that includes a first signal field (SIG) followed by a second SIG that is followed by a third SIG;

process the OFDM packet to classify a packet format of the OFDM packet among a plurality of OFDM packet formats including a first OFDM packet format, a second OFDM packet format, and a third OFDM packet format, wherein, based on;

the first OFDM packet format, the first SIG includes first content;

the second OFDM packet format, the second SIG has a first phase that is 90 degrees phase shifted from a second phase of the third SIG; and

the second OFDM packet format and the third OFDM packet format, the first SIG includes second content; and

process the OFDM packet based on the packet format that is classified.

2. The wireless communication device of claim 1, wherein, based on the third OFDM packet format, the second SIG and the third SIG have the first phase.

3. The wireless communication device of claim 1, wherein the OFDM packet includes a short training field (STF) that is adjacently followed by a long training field (LTF) that is adjacently followed by a copy of the first SIG that is adjacently followed by the first SIG that is adjacently followed by the second SIG that is adjacently followed by the third SIG, wherein the STF, the LTF, and the first SIG are based on a first communication protocol, and wherein the second SIG and the third SIG are based on a second communication protocol that is different than the first communication protocol.

4. The wireless communication device of claim 1, wherein the OFDM packet includes the preamble followed by data, wherein a first portion of the preamble is based on a first communication protocol and includes the first SIG that is adjacently preceded by a copy of the first SIG, and wherein a second portion of the preamble is based on a second communication protocol and includes the second SIG and the third SIG.

5. The wireless communication device of claim 1, wherein the OFDM packet includes the preamble such that the first SIG is followed by the second SIG is followed by the third SIG, wherein the first SIG includes information that specifies modulation coding set (MCS) of at least one of the second SIG or the third SIG.

6. The wireless communication device of claim 1, wherein the OFDM packet includes an orthogonal frequency division multiple access (OFDMA) packet that is modulated based on a plurality of OFDMA sub-carriers and includes first data intended for the wireless communication device that is modulated within a first subset of the plurality of OFDMA sub-carriers and second data intended for at least one other wireless communication device that is modulated within a second subset of the plurality of OFDMA sub-carriers, wherein the first OFDM packet format includes a first OFDMA packet format, wherein the second OFDM packet format includes a second OFDMA packet format, and the third OFDM packet format includes a third OFDMA packet format.

7. The wireless communication device of claim 1 further comprising:

a wireless station (STA), wherein the another wireless communication device includes another STA.

8. The wireless communication device of claim 1 further comprising:

a wireless station (STA), wherein the another wireless communication device includes an access point (AP).

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;

receive an orthogonal frequency division multiple access (OFDMA) packet from another wireless communication device, wherein the OFDMA packet includes a preamble that includes a first signal field (SIG) followed by a second SIG that is followed by a third SIG;

process the OFDMA packet to classify a packet format of the OFDMA packet among a plurality of OFDMA packet formats including a first OFDMA packet format, a second OFDMA packet format, and a third OFDMA packet format, wherein, based on;

the first OFDMA packet format, the first SIG includes first content;

the second OFDMA packet format, the second SIG has a first phase that is 90 degrees phase shifted from a second phase of the third SIG;

the second OFDMA packet format and the third OFDMA packet format, the first SIG includes second content; and

the third OFDMA packet format, the second SIG and the third SIG have the first phase; and

process the OFDMA packet based on the packet format that is classified.

10. The wireless communication device of claim 9, wherein the OFDMA packet includes a short training field (STF) that is adjacently followed by a long training field (LTF) that is adjacently followed by a copy of the first SIG that is adjacently followed by the first SIG that is adjacently followed by the second SIG that is adjacently followed by the third SIG, wherein the STF, the LTF, and the first SIG are based on a first communication protocol, and wherein the second SIG and the third SIG are based on a second communication protocol that is different than the first communication protocol.

11. The wireless communication device of claim 9, wherein the OFDMA packet includes the preamble such that the first SIG is followed by the second SIG is followed by the third SIG, wherein the first SIG includes information that specifies modulation coding set (MCS) of at least one of the second SIG or the third SIG.

12. The wireless communication device of claim 9, wherein the OFDMA packet is modulated based on a plurality of OFDMA sub-carriers and includes first data intended for the wireless communication device that is modulated within a first subset of the plurality of OFDMA sub-carriers and second data intended for at least one other wireless communication device that is modulated within a second subset of the plurality of OFDMA sub-carriers.

13. The wireless communication device of claim 9 further comprising:

a wireless station (STA), wherein the another wireless communication device includes another STA.

14. A method for execution by a wireless communication device, the method comprising:

receiving, via a communication interface of the wireless communication device, an orthogonal frequency division multiplexing (OFDMA) packet from another wireless communication device, wherein the OFDM packet includes a preamble that includes a first signal field (SIG) followed by a second SIG that is followed by a third SIG;

processing the OFDM packet to classify a packet format of the OFDM packet among a plurality of OFDM packet formats including a first OFDM packet format, a second OFDM packet format, and a third OFDM packet format, wherein, based on;

the first OFDM packet format, the first SIG includes first content;

the second OFDM packet format, the second SIG has a first phase that is 90 degrees phase shifted from a second phase of the third SIG; and

the second OFDM packet format and the third OFDM packet format, the first SIG includes second content; and

processing the OFDM packet based on the packet format that is classified.

15. The method of claim 14, wherein, based on the third OFDM packet format, the second SIG and the third SIG have the first phase.

16. The method of claim 14, wherein the OFDM packet includes a short training field (STF) that is adjacently followed by a long training field (LTF) that is adjacently followed by a copy of the first SIG that is adjacently followed by the first SIG that is adjacently followed by the second SIG that is adjacently followed by the third SIG, wherein the STF, the LTF, and the first SIG are based on a first communication protocol, and wherein the second SIG and the third SIG are based on a second communication protocol that is different than the first communication protocol.

17. The method of claim 14, wherein the OFDM packet includes the preamble followed by data, wherein a first portion of the preamble is based on a first communication protocol and includes the first SIG that is adjacently preceded by a copy of the first SIG, and wherein a second portion of the preamble is based on a second communication protocol and includes the second SIG and the third SIG.

18. The method of claim 14, wherein the OFDM packet includes the preamble such that the first SIG is followed by the second SIG is followed by the third SIG, wherein the first SIG includes information that specifies modulation coding set (MCS) of at least one of the second SIG or the third SIG.

19. The method of claim 14, wherein the OFDM packet includes an orthogonal frequency division multiple access (OFDMA) packet that is modulated based on a plurality of OFDMA sub-carriers and includes first data intended for the wireless communication device that is modulated within a first subset of the plurality of OFDMA sub-carriers and second data intended for at least one other wireless communication device that is modulated within a second subset of the plurality of OFDMA sub-carriers, wherein the first OFDM packet format includes a first OFDMA packet format, wherein the second OFDM packet format includes a second OFDMA packet format, and the third OFDM packet format includes a third OFDMA packet format.

20. The method of claim 14, wherein the wireless communication device includes a wireless station (STA), and the another wireless communication device includes another STA.