PPDU format preamble design

• US 20160119452A1
• Filed: 10/28/2015
• Published: 04/28/2016
• Est. Priority Date: 10/28/2014
• Status: Active Grant

• Current Assignee: Atlas Global Technologies LLC (Acacia Research Corporation)
• Original Assignee: Newracom Inc.
• Inventors: Lee, Daewon
• Granted Patent: US 9,736,277 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 69/10 Streamlined, light-weight or high-speed protocols, e.g. express transfer protocol [XTP] or byte stream
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers

Abstract

In an example of wireless communications, an access point may generate a frame and provide the frame for transmission to one or more stations. The frame may include a first signal field, a second signal field, and a data field. The first signal field may have a duration of 4 μs and may include a first signal portion and a first guard interval. The second signal field may have a duration of 4 μs and may include a second signal portion and a second guard interval. The data field may include at least one data symbol that has a symbol duration of 12.8 μs, excluding any guard interval duration. A station may detect the frame and process the frame. Other methods, apparatus, and computer-readable media are also disclosed.

Claims

1. An apparatus for facilitating wireless communication, the apparatus comprising:

one or more memories; and

one or more processors coupled to the one or more memories, the one or more processors configured to cause;

generating a frame, the frame comprising;

a first signal field including a first signal portion and a first guard interval, the first signal field having a duration of 4 μ

s;

a second signal field including a second signal portion and a second guard interval, the second signal field having a duration of 4 μ

s, wherein content of the second signal portion is the same as content of the first signal portion; and

a data field including one or more data symbols, each of the one or more data symbols having a symbol duration of 12.8 its, the symbol duration excluding any guard interval duration; and

providing the frame for transmission.

2. The apparatus of claim 1, wherein the second signal portion is the same as the first signal portion in time domain.

3. The apparatus of claim 2, wherein the second signal portion immediately follows the first signal portion.

4. The apparatus of claim 3, wherein the second guard interval immediately follows the second signal portion.

5. The apparatus of claim 1, wherein the second signal portion is a cyclically extended version of the first signal portion in time domain.

6. The apparatus of claim 5, wherein the second guard interval immediately precedes the second signal portion.

7. The apparatus of claim 1, wherein the second signal portion is the first signal portion multiplied by a sequence.

8. The apparatus of claim 7, wherein the sequence includes values whose absolute value is 1.

9. The apparatus of claim 8, wherein the values consist of at least two of +1, +j, −

1, or −

j.

10. The apparatus of claim 1, wherein the second signal field immediately follows the first signal field.

11. The apparatus of claim 1, wherein each of the first and second guard intervals has a duration of 0.8 μ

s, and each of the first and second signal portions has a duration of 3.2 μ

s.

12. The apparatus of claim 1, wherein the frame further comprises a Legacy Short Training Field (L-STF), and a Legacy Long Training Field (L-LTF) immediately following the L-STF, the L-LTF immediately preceding the first signal field.

13. A computer-implemented method of facilitating wireless communication, the method comprising:

detecting a frame, the frame comprising;

a first signal field including a first signal portion and a first guard interval, the first signal field having a duration of 4 μ

s;

a second signal field including a second signal portion and a second guard interval, the second signal field having a duration of 4 μ

s; and

a data field including at least one data symbol, the at least one data symbol having a symbol duration of 12.8 μ

s, the symbol duration excluding any guard interval duration; and

processing the frame.

14. The method of claim 13, wherein the processing comprises determining a version associated with the frame based at least on the first signal field and the second signal field.

15. The method of claim 13, wherein the second signal portion is the same as the first signal portion in time domain.

16. The method of claim 15, wherein the second signal portion immediately follows the first signal portion.

17. The method of claim 13, wherein the second signal portion is a cyclically extended version of the first signal portion in time domain.

18. The method of claim 13, wherein the first signal field and the second signal field together are equivalent to having a guard interval and two cyclically shifted versions of the first signal portion.

19. The method of claim 13, wherein the second guard interval is a postfix.

20. The method of claim 13, wherein the version is a high efficiency version.