ROBUST EARLY DETECTION THROUGH SIGNAL REPETITION IN MIXED-RATE WIRELESS COMMUNICATIONS

• US 20160227436A1
• Filed: 02/02/2016
• Published: 08/04/2016
• Est. Priority Date: 02/04/2015
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Vermani, Sameer, Tian, Bin, Tian, Tao
• Granted Patent: US 10,419,971 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365

Abstract

A method of wirelessly communicating includes generating, at a wireless device, a packet including a first preamble field. The method further includes generating a first repeated preamble field by multiplying the first preamble field by a first frequency-domain polarity sequence. The method further includes transmitting the packet from the wireless device. The packet includes the first preamble field and the first repeated preamble field.

Claims

1. A method of wireless communication, comprising:

generating, at a wireless device, a packet comprising a first preamble field;

generating a first repeated preamble field by multiplying the first preamble field by a first frequency-domain polarity sequence; and

transmitting the packet from the wireless device, wherein the packet comprises the first preamble field and the first repeated preamble field.

2. The method of claim 1, wherein the first preamble field is decodable by a plurality of devices, and the packet comprises a second preamble field decodable by only a subset of the plurality of devices.

3. The method of claim 1, wherein the first frequency-domain polarity sequence comprises a predetermined sequence of −

1 or +1.

4. The method of claim 1, wherein the first preamble field comprises a length indication that is not a multiple of 3.

5. The method of claim 1, further comprising generating a second repeated preamble field by multiplying a second preamble field by a second frequency-domain polarity sequence, wherein the packet comprises the second repeated preamble field.

6. The method of claim 1, wherein:

the first preamble field comprises a legacy signal (L-SIG) field, the legacy preamble being decodable by a plurality of devices; and

the first repeated preamble field comprises a repeated legacy signal (RL-SIG) field.

7. An apparatus configured to perform wireless communication, comprising:

a processor configured to;

generate a packet comprising a first preamble field; and

generate a first repeated preamble field by multiplying the first preamble field by a first frequency-domain polarity sequence; and

a transmitter configured to transmit the packet from the apparatus, wherein the packet comprises the first preamble field and the first repeated preamble field.

8. The apparatus of claim 7, wherein the first preamble field is decodable by a plurality of devices, and the packet comprises a second preamble field decodable by only a subset of the plurality of devices.

9. The apparatus of claim 7, wherein the first frequency-domain polarity sequence comprises a predetermined sequence of −

1 or +1.

10. The apparatus of claim 7, wherein the first preamble field comprises a length indication that is not a multiple of 3.

11. The apparatus of claim 7, wherein the processor is further configured to generate a second repeated preamble field by multiplying a second preamble field by a second frequency-domain polarity sequence, wherein the packet comprises the other repeated preamble field.

12. The apparatus of claim 7, wherein:

the first preamble field comprises a legacy signal (L-SIG) field, the legacy preamble being decodable by a plurality of devices; and

the first repeated preamble field comprises a repeated legacy signal (RL-SIG) field.

13. An apparatus for wireless communication, comprising:

means for generating a packet comprising a first preamble field;

means for generating a first repeated preamble field by multiplying the first preamble field by a first frequency-domain polarity sequence; and

means for transmitting the packet from the apparatus, wherein the packet comprises the first preamble field and the first repeated preamble field.

14. The apparatus of claim 13, wherein the first preamble field is decodable by a plurality of devices, and the packet comprises a second preamble field decodable by only a subset of the plurality of devices.

15. The apparatus of claim 13, wherein the first frequency-domain polarity sequence comprises a predetermined sequence of −

1 or +1.

16. The apparatus of claim 13, wherein the first preamble field comprises a length indication that is not a multiple of 3.

17. The apparatus of claim 13, further comprising means for generating a second repeated preamble field by multiplying a second preamble field by a second frequency-domain polarity sequence, wherein the packet comprises the other repeated preamble field.

18. The apparatus of claim 13, wherein:

the first preamble field comprises a legacy signal (L-SIG) field, the legacy preamble being decodable by a plurality of devices; and

the first repeated preamble field comprises a repeated legacy signal (RL-SIG) field.

19. A non-transitory computer-readable medium comprising code that, when executed, causes an apparatus to:

generate a packet comprising a first preamble field;

generate a first repeated preamble field by multiplying the first preamble field by a first frequency-domain polarity sequence; and

transmit the packet from the apparatus, wherein the packet comprises the first preamble field and the first repeated preamble field.

20. The medium of claim 19, wherein:

the first preamble field comprises a legacy signal (L-SIG) field, the legacy preamble being decodable by a plurality of devices; and

the first repeated preamble field comprises a repeated legacy signal (RL-SIG) field.