Short training field (STF) for use within single user, multiple user, multiple access, and/or MIMO wireless communications

• US 9,407,485 B2
• Filed: 07/31/2015
• Issued: 08/02/2016
• Est. Priority Date: 04/24/2011
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Porat, Ron, Zheng, Jun
• Primary Examiner(s): Elliott, IV, Benjamin H
• Assistant Examiner(s): Nowlin, Eric
• Application Number:
  US14/814,991
• Publication Number:
  US 20150341197A1
• Time in Patent Office: 368 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2603 Signal structure ensuring backward compatibility with legacy system
• CPC Class Codes: H04L 27/26035 Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences using different training sequence per antenna H04B7/0684; code allocation H04J13/16
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/2618 Reduction thereof using auxiliary subcarriers
• CPC Class Codes: H04L 27/2666 Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length
• CPC Class Codes: H04W 52/18 TPC being performed according to specific parameters
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

Short training field (STF) for use within single user, multiple user, multiple access, and/or MIMO wireless communications. An STF design as is made such that the power associated with the tone indices at the edges of the STF design is relatively less than the power associated with the tone indices more centrally located within the STF design. Also, when multiple respective operational modes are supported (e.g., 1 MHz and 2 MHz), the respective STF designs corresponding to those respective operational modes have a great deal of similarity. For example, the respective STF designs for different respective operational modes may have certain common STF tone indices among those respective STF designs.

Claims

1. A wireless communication device comprising:

a communication interface; and

a processor, at least one of the processor or the communication interface configured to;

generate an orthogonal frequency division multiplexing (OFDM) packet that includes at least one field having information modulated on a plurality of sub-carriers, wherein the plurality of sub-carriers has a tapered power profile such that a first sub-carrier located at a first edge of the plurality of sub-carriers and a second sub-carrier located at a second edge of the plurality of sub-carriers have relatively less power than at least one other sub-carrier of the plurality of sub-carriers that is located between the first sub-carrier and second sub-carrier, wherein first average power of a first field of the OFDM packet is relatively greater than second average power of a second field of the OFDM packet; and

transmit the OFDM packet to another wireless communication device.

2. The wireless communication device of claim 1, wherein the at least one of the processor or the communication interface is further configured to:

reduce first power of the first sub-carrier and the second sub-carrier relative to second power of the at least one other sub-carrier located between the first sub-carrier and second sub-carrier to generate the OFDM packet having the plurality of sub-carriers having the tapered power profile to reduce average peak to average power ratio (PAPR) of the at least one field.

3. The wireless communication device of claim 1, wherein the at least one of the processor or the communication interface is further configured to:

boost first power of the at least one other sub-carrier located between the first sub-carrier and second sub-carrier relative to second power of the first sub-carrier and the second sub-carrier to generate the OFDM packet having the plurality of sub-carriers having the tapered power profile to reduce average peak to average power ratio (PAPR) of the at least one field.

4. The wireless communication device of claim 1, wherein the at least one of the processor or the communication interface is further configured to:

generate another OFDM packet that includes the first field having first information modulated on the plurality of sub-carriers and the second field having second information modulated on another plurality of sub-carriers; and

transmit the another OFDM packet to another wireless communication device.

5. The wireless communication device of claim 1, wherein the at least one of the processor or the communication interface is further configured to:

support OFDM communications with the another wireless communication device based on a plurality of communication channels respectively having a plurality of channel bandwidths;

generate, when supporting the OFDM communications using a communication channel of the plurality of communication channels having a relatively most narrow channel bandwidth of the plurality of channel bandwidths, the OFDM packet that includes the at least one field having the information modulated on the plurality of sub-carriers, wherein the plurality of sub-carriers has the tapered power profile;

generate another OFDM packet that includes other information modulated on another plurality of sub-carriers when supporting the OFDM communications using another communication channel of the plurality of communication channels; and

transmit the another OFDM packet to at least one of the another wireless communication device or at least one additional wireless communication device.

6. The wireless communication device of claim 1, wherein the at least one of the processor or the communication interface is further configured to:

generate the OFDM packet, wherein the plurality of sub-carriers has the tapered power profile such that the first sub-carrier located at the first edge of the plurality of sub-carriers and the second sub-carrier located at the second edge of the plurality of sub-carriers have a first power that is approximately one-half relative to a second power of the at least one other sub-carrier located of the plurality of sub-carriers that is located between the first sub-carrier and second sub-carrier.

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

a cellular telephone, a two-way radio, a personal digital assistant (PDA), a personal computer (PC), a laptop computer, or home entertainment equipment.

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

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

9. A wireless communication device comprising:

a communication interface; and

a processor, at least one of the processor or the communication interface configured to;

generate an orthogonal frequency division multiplexing (OFDM) packet that includes a first field having first information modulated on a first plurality of sub-carriers and a second field having second information modulated on a second plurality of sub-carriers, wherein the first plurality of sub-carriers has a tapered power profile such that a first sub-carrier located at a first edge of the first plurality of sub-carriers and a second sub-carrier located at a second edge of the first plurality of sub-carriers have relatively less power than at least one other sub-carrier of the first plurality of sub-carriers that is located between the first sub-carrier and second sub-carrier, wherein first average power of the first field of the OFDM packet is relatively greater than second average power of the second field of the OFDM packet; and

transmit the OFDM packet to another wireless communication device.

10. The wireless communication device of claim 9, wherein the at least one of the processor or the communication interface is further configured to:

reduce first power of the first sub-carrier and the second sub-carrier relative to second power of the at least one other sub-carrier of the first plurality of sub-carriers that is located between the first sub-carrier and second sub-carrier to generate the OFDM packet having the first plurality of sub-carriers having the tapered power profile to reduce average peak to average power ratio (PAPR) of the first field.

11. The wireless communication device of claim 9, wherein the at least one of the processor or the communication interface is further configured to:

support OFDM communications with the another wireless communication device based on a plurality of communication channels respectively having a plurality of channel bandwidths;

generate, when supporting OFDM communications using a communication channel of the plurality of communication channels having a relatively most narrow channel bandwidth of the plurality of channel bandwidths, the OFDM packet that includes the first field having the first information modulated on the first plurality of sub-carriers and the second field having the second information modulated on the second plurality of sub-carriers, wherein the first plurality of sub-carriers has the tapered power profile;

generate another OFDM packet that includes other information modulated on another plurality of sub-carriers when supporting the OFDM communications using another communication channel of the plurality of communication channels; and

transmit the another OFDM packet to at least one of the another wireless communication device or at least one additional wireless communication device.

12. The wireless communication device of claim 9, wherein the at least one of the processor or the communication interface is further configured to:

generate the OFDM packet, wherein the first plurality of sub-carriers has the tapered power profile such that the first sub-carrier located at the first edge of the first plurality of sub-carriers and the second sub-carrier located at the second edge of the first plurality of sub-carriers have a first power that is approximately one-half relative to a second power of the at least one other sub-carrier of the first plurality of sub-carriers that is located between the first sub-carrier and second sub-carrier.

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

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

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

generating an orthogonal frequency division multiplexing (OFDM) packet that includes at least one field having information modulated on a plurality of sub-carriers, wherein the plurality of sub-carriers has a tapered power profile such that a first sub-carrier located at a first edge of the plurality of sub-carriers and a second sub-carrier located at a second edge of the plurality of sub-carriers have relatively less power than at least one other sub-carrier of the plurality of sub-carriers that is located between the first sub-carrier and second sub-carrier, wherein first average power of a first field of the OFDM packet is relatively greater than second average power of a second field of the OFDM packet; and

transmitting, via a communication interface of the wireless communication device, the OFDM packet to another wireless communication device.

15. The method of claim 14 further comprising:

reducing first power of the first sub-carrier and the second sub-carrier relative to second power of the at least one other sub-carrier located between the first sub-carrier and second sub-carrier to generate the OFDM packet having the plurality of sub-carriers having the tapered power profile to reduce average peak to average power ratio (PAPR) of the at least one field.

16. The method of claim 14 further comprising:

boosting first power of the at least one other sub-carrier located between the first sub-carrier and second sub-carrier relative to second power of the first sub-carrier and the second sub-carrier to generate the OFDM packet having the plurality of sub-carriers having the tapered power profile to reduce average peak to average power ratio (PAPR) of the at least one field.

17. The method of claim 14 further comprising:

generating another OFDM packet that includes the first field having first information modulated on the plurality of sub-carriers and the second field having second information modulated on another plurality of sub-carriers; and

transmitting the another OFDM packet to another wireless communication device.

18. The method of claim 14 further comprising:

supporting OFDM communications with the another wireless communication device based on a plurality of communication channels respectively having a plurality of channel bandwidths;

generating, when supporting the OFDM communications using a communication channel of the plurality of communication channels having a relatively most narrow channel bandwidth of the plurality of channel bandwidths, the OFDM packet that includes the at least one field having the information modulated on the plurality of sub-carriers, wherein the plurality of sub-carriers has the tapered power profile;

generating another OFDM packet that includes other information modulated on another plurality of sub-carriers when supporting the OFDM communications using another communication channel of the plurality of communication channels; and

transmitting the another OFDM packet to at least one of the another wireless communication device or at least one additional wireless communication device.

19. The method of claim 14 further comprising:

generating the OFDM packet, wherein the plurality of sub-carriers has the tapered power profile such that the first sub-carrier located at the first edge of the plurality of sub-carriers and the second sub-carrier located at the second edge of the plurality of sub-carriers have a first power that is approximately one-half relative to a second power of the at least one other sub-carrier of the plurality of sub-carriers that is located between the first sub-carrier and second sub-carrier.

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