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

• US 9,113,490 B2
• Filed: 04/23/2012
• Issued: 08/18/2015
• 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:
  US13/454,021
• Publication Number:
  US 20120269125A1
• Time in Patent Office: 1,212 Days
• Field of Search: 370/328, 370/329, 370/338, 370/312, 370/310, 370/474, 370/252, 370/349, 370/476, 455/39
• US Class Current: 1/1
• CPC Class Codes: H04L 27/2602 Signal structure
• 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, the processor and the communication interface configured to;

support orthogonal frequency division multiplexing (OFDM) communications with another wireless communication device using any of a plurality of packet types corresponding to a plurality of channel bandwidths;

generate, when supporting OFDM communications based on a relatively most narrow channel bandwidth of the plurality of channel bandwidths, an OFDMA packet including to;

boost magnitude of first data within sub-carriers of a short training field (STF) of the OFDMA packet relative to second data within sub-carriers of other fields of the OFDMA packet to generate a boosted STF of the OFDMA packet; and

reduce magnitude of a first subset of the first data within two sub-carriers located at a first edge and a second edge of the boosted STF relative to a second subset of the first data within sub-carriers located between the two sub-carriers located at the first edge and the second edge of the boosted STF based on a tapered power profile; and

transmit the OFDMA packet to the another wireless communication device.

2. The wireless communication device of claim 1, wherein the plurality of channel bandwidths includes a 1 MHz channel bandwidth and a 2 MHz channel bandwidth, and the relatively most narrow channel bandwidth of the plurality of channel bandwidths is the 1 MHz channel bandwidth.

3. The wireless communication device of claim 1, wherein the STF of the OFDMA packet includes every 4^th sub-carrier modulated and includes a plurality of sub-carriers having indices of [−

12;

4;

−

4, 4;

4;

12] or [−

12 −

8 −

4 4 8 12].

4. The wireless communication device of claim 1, wherein:

the plurality of channel bandwidths includes a 1 MHz channel bandwidth and a 2 MHz channel bandwidth; and

the relatively most narrow channel bandwidth of the plurality of channel bandwidths is the 1 MHz channel bandwidth; and

the STF of the OFDMA packet that is based on the 1 MHz channel bandwidth includes every 4^th sub-carrier modulated and includes a first plurality of sub-carriers having indices of [−

12;

4;

−

4, 4;

4;

12] or [−

12 −

8 −

4 4 8 12] that is a subset of a second plurality of sub-carriers associated with the 2 MHz channel bandwidth.

5. The wireless communication device of claim 1, wherein the processor and the communication interface are further configured to:

reduce the magnitude of the first subset of the first data within the two sub-carriers located at the first edge and the second edge of the boosted STF by a factor of one-half relative to the second subset of the first data within sub-carriers located between the two sub-carriers located at the first edge and the second edge of the boosted STF based on the tapered power profile.

6. The wireless communication device of claim 1, wherein the processor and the communication interface are further configured to:

reduce the magnitude of the first subset of the first data within the two sub-carriers located at the first edge and the second edge of the boosted STF by a factor of one-half relative to the second subset of the first data within sub-carriers located between the two sub-carriers located at the first edge and the second edge of the boosted STF based on the tapered power profile to reduce peak to average power ratio (PAPR) of the boosted STF.

7. The wireless communication device of claim 1, wherein the processor and the communication interface are further configured to:

generate, when supporting OFDM communications based on a relatively most narrow channel bandwidth of the plurality of channel bandwidths, the OFDMA packet including to repeat the boosted STF within the OFDMA packet.

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

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

9. A wireless communication device comprising:

a communication interface; and

a processor, the processor and the communication interface configured to;

support orthogonal frequency division multiplexing (OFDM) communications with another wireless communication device using any of a plurality of packet types corresponding to a plurality of channel bandwidths that includes a 1 MHz channel bandwidth and a 2 MHz channel bandwidth;

generate, when supporting OFDM communications based on the 1 MHz channel bandwidth, an OFDMA packet including to;

boost magnitude of first data within sub-carriers of a short training field (STF) of the OFDMA packet relative to second data within sub-carriers of other fields of the OFDMA packet to generate a boosted STF of the OFDMA packet, wherein the STF includes every 4^th sub-carrier modulated; and

reduce magnitude of a first subset of the first data within two sub-carriers located at a first edge and a second edge of the boosted STF by a factor of one-half relative to a second subset of the first data within sub-carriers located between the two sub-carriers located at the first edge and the second edge of the boosted STF based on a tapered power profile to reduce peak to average power ratio (PAPR) of the boosted STF; and

transmit the OFDMA packet to the another wireless communication device.

10. The wireless communication device of claim 9, wherein:

the 1 MHz channel bandwidth is a relatively most narrow channel bandwidth of the plurality of channel bandwidths; and

the STF of the OFDMA packet that is based on the 1 MHz channel bandwidth includes every 4^th sub-carrier modulated and includes a first plurality of sub-carriers having indices of [−

12;

4;

−

4, 4;

4;

12] or [−

12 −

8 −

4 4 8 12] that is a subset of a second plurality of sub-carriers associated with the 2 MHz channel bandwidth.

11. The wireless communication device of claim 9, wherein the processor and the communication interface are further configured to:

generate, when supporting OFDM communications based on the 2 MHz channel bandwidth, another OFDMA packet; and

transmit the another OFDMA packet to the another wireless communication device.

12. The wireless communication device of claim 9, wherein the processor and the communication interface are further configured to:

generate, when supporting OFDM communications based on a relatively most narrow channel bandwidth of the plurality of channel bandwidths, the OFDMA packet including to repeat the boosted STF within the OFDMA packet.

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

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

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

supporting, via a communication interface of the wireless communication device, orthogonal frequency division multiplexing (OFDM) communications with another wireless communication device using any of a plurality of packet types corresponding to a plurality of channel bandwidths;

generating, when supporting OFDM communications based on a relatively most narrow channel bandwidth of the plurality of channel bandwidths, an OFDMA packet including;

boosting magnitude of first data within sub-carriers of a short training field (STF) of the OFDMA packet relative to second data within sub-carriers of other fields of the OFDMA packet to generate a boosted STF of the OFDMA packet; and

reducing magnitude of a first subset of the first data within two sub-carriers located at a first edge and a second edge of the boosted STF relative to a second subset of the first data within sub-carriers located between the two sub-carriers located at the first edge and the second edge of the boosted STF based on a tapered power profile; and

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

15. The method of claim 14, wherein the plurality of channel bandwidths includes a 1 MHz channel bandwidth and a 2 MHz channel bandwidth, and the relatively most narrow channel bandwidth of the plurality of channel bandwidths is the 1 MHz channel bandwidth.

16. The method of claim 14, wherein:

the plurality of channel bandwidths includes a 1 MHz channel bandwidth and a 2 MHz channel bandwidth; and

the relatively most narrow channel bandwidth of the plurality of channel bandwidths is the 1 MHz channel bandwidth; and

the STF of the OFDMA packet that is based on the 1 MHz channel bandwidth includes every 4^th sub-carrier modulated and includes a first plurality of sub-carriers having indices of [−

12;

4;

−

4, 4;

4;

12] or [−

12 −

8 −

4 4 8 12] that is a subset of a second plurality of sub-carriers associated with the 2 MHz channel bandwidth.

17. The method of claim 14 further comprising:

reducing the magnitude of the first subset of the first data within the two sub-carriers located at the first edge and the second edge of the boosted STF by a factor of one-half relative to the second subset of the first data within sub-carriers located between the two sub-carriers located at the first edge and the second edge of the boosted STF based on the tapered power profile to reduce peak to average power ratio (PAPR) of the boosted STF.

18. The method of claim 14 further comprising:

generating, when supporting OFDM communications based on a relatively most narrow channel bandwidth of the plurality of channel bandwidths, the OFDMA packet including to repeat the boosted STF within the OFDMA packet.

19. The method of claim 14, wherein the plurality of channel bandwidths includes a 1 MHz channel bandwidth and a 2 MHz channel bandwidth, and the relatively most narrow channel bandwidth of the plurality of channel bandwidths is the 1 MHz channel bandwidth;

and further comprising;

generating, when supporting OFDM communications based on the 2 MHz channel bandwidth, another OFDMA packet; and

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

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