SYSTEMS AND METHODS FOR WIRELESS COMMUNICATION OF LONG DATA UNITS

• US 20130177090A1
• Filed: 12/10/2012
• Published: 07/11/2013
• Est. Priority Date: 01/06/2012
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Yang, Lin, Van Nee, Didier Johannes Richard, Vermani, Sameer, Sampath, Hemanth
• Granted Patent: US 9,088,504 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04L 25/0232 by interpolation between sounding signals
• 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 41/16 using machine learning or artificial intelligence
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path

Abstract

Systems, methods, and devices for communicating long packets are described herein. In one aspect, an apparatus for wireless communication includes a receiver and a processor. The receiver wirelessly receives via wireless local area network a data unit comprising a plurality of training fields interposed between data symbols. The plurality of training fields includes a first training field followed by a second training field. The first training field includes a gain control sequence, and the second training field includes a channel estimation sequence. The processor decodes at least one data symbol based on the plurality of training fields. In another aspect, an apparatus for wireless communication includes a processor and a transmitter. The processor generates a data unit comprising a plurality of training fields inserted between data symbols, and the transmitter wirelessly transmits the data unit via wireless local area network.

Claims

1. An apparatus for wireless communication, comprising:

a receiver configured to wirelessly receive via wireless local area network a data unit comprising a plurality of training fields interposed between data symbols, the plurality of training fields comprising a first training field followed by a second training field, the first training field including a gain control sequence, the second training field including a channel estimation sequence; and

a processor configured to decode at least one data symbol based on the plurality of training fields.

2. The apparatus of claim 1, wherein

the receiver is configured to receive the data unit via one spatial stream, and

the first training field has a duration of one orthogonal frequency-division multiplexing (OFDM) symbol and the second training field has a duration of two OFDM symbols.

3. The apparatus of claim 2, wherein the second training field comprises a double guard interval followed by a first training symbol and a second training symbol.

4. The apparatus of claim 3, wherein

the data unit comprises a physical layer protocol data unit,

the plurality of training fields are periodically repeated in the data unit after a non-zero integer number of data symbols,

the plurality of training fields are received over a wireless channel, the processor is further configured to estimate a quality of the wireless channel based on the second training field and decode the at least one data symbol based on the estimated quality of the channel,

the double guard interval has a duration of 16 microseconds, and

the receiver comprises an amplifier having a first gain, the receiver is further configured to perform automatic gain control using the first training field to adjust the first gain.

5. The apparatus of claim 2, wherein the second training field comprises a first guard interval followed by a first training symbol, followed by a second guard interval, followed by a second training symbol.

6. The apparatus of claim 1, wherein the receiver is configured to receive the data unit via one spatial stream, and either

the first training field has a duration of one orthogonal frequency-division multiplexing (OFDM) symbol and the second training field has a duration of one OFDM symbol, or

the first training field has the duration of two OFDM symbols and the second training field has the duration of two OFDM symbols.

7. The apparatus of claim 1, wherein

a transmission coding of the data symbols has a spectral efficiency lower than binary phase-shift keying (BPSK) modulation with rate half coding, and

the first training field has a duration of two orthogonal frequency-division multiplexing (OFDM) symbols and the second training field has a duration of four OFDM symbols.

8. The apparatus of claim 7, wherein the second training field comprises a double guard interval followed by a first training symbol and a second training symbol, followed by a first guard interval, followed by a third training symbol, followed by a second guard interval, followed by a fourth training symbol.

9. The apparatus of claim 7, wherein the second training field comprises a first guard interval followed by a first training symbol, followed by a second guard interval, followed by a second training symbol, followed by a third guard interval, followed by a third training symbol, followed by a fourth guard interval, followed by a fourth training symbol.

10. The apparatus of claim 1, wherein

the receiver is configured to receive the data unit via a first number of spatial streams,

the plurality of training fields comprise the first training field followed by the first number of second training fields, the first training field having a duration of one orthogonal frequency-division multiplexing (OFDM) symbol, each second training field having a duration of one OFDM symbol, and

each second training field comprises a guard interval followed by a training symbol.

11. An apparatus for wireless communication, comprising:

a processor configured to generate a data unit comprising a plurality of training fields inserted between data symbols, the plurality of training fields comprising a first training field followed by a second training field, the first training field including a gain control sequence, the second training field including a channel estimation sequence; and

a transmitter configured to wirelessly transmit the data unit via wireless local area network.

12. The apparatus of claim 11, wherein

the transmitter is configured to transmit the data unit via one spatial stream, and

the first training field has a duration of one orthogonal frequency-division multiplexing (OFDM) symbol and the second training field has a duration of two OFDM symbols.

13. The apparatus of claim 12, wherein the second training field comprises a double guard interval followed by a first training symbol and a second training symbol.

14. The apparatus of claim 13, wherein

the data unit comprises a physical layer protocol data unit,

the plurality of training fields are periodically repeated in the data unit after a non-zero integer number of data symbols, and

the double guard interval has a duration of 16 microseconds.

15. The apparatus of claim 12, wherein the second training field comprises a first guard interval followed by a first training symbol, followed by a second guard interval, followed by a second training symbol.

16. The apparatus of claim 11, wherein the transmitter is configured to transmit the data unit via one spatial stream, and either

the first training field has a duration of one orthogonal frequency-division multiplexing (OFDM) symbol and the second training field has a duration of one OFDM symbol, or

the first training field has the duration of two OFDM symbols and the second training field has the duration of two OFDM symbols.

17. The apparatus of claim 11, wherein

a transmission coding of the data symbols has a spectral efficiency lower than binary phase-shift keying (BPSK) modulation with rate half coding, and

the first training field has a duration of two orthogonal frequency-division multiplexing (OFDM) symbols and the second training field has a duration of four OFDM symbols.

18. The apparatus of claim 17, wherein the second training field comprises a double guard interval followed by a first training symbol and a second training symbol, followed by a first guard interval, followed by a third training symbol, followed by a second guard interval, followed by a fourth training symbol.

19. The apparatus of claim 17, wherein the second training field comprises a first guard interval followed by a first training symbol, followed by a second guard interval, followed by a second training symbol, followed by a third guard interval, followed by a third training symbol, followed by a fourth guard interval, followed by a fourth training symbol.

20. The apparatus of claim 11, wherein

the transmitter is configured to transmit the data unit via a first number of spatial streams,

the plurality of training fields comprise the first training field followed by the first number of second training fields, the first training field having a duration of one orthogonal frequency-division multiplexing (OFDM) symbol, each second training field having a duration of one OFDM symbol, and

each second training field comprises a guard interval followed by a training symbol.

21. A method of wireless communication, comprising:

wirelessly receiving via wireless local area network a data unit comprising a plurality of training fields interposed between data symbols, the plurality of training fields comprising a first training field followed by a second training field, the first training field including a gain control sequence, the second training field including a channel estimation sequence; and

decoding at least one data symbol based on the plurality of training fields.

22. The method of claim 21, further comprising receiving the data unit via one spatial stream, wherein the first training field has a duration of one orthogonal frequency-division multiplexing (OFDM) symbol and the second training field has a duration of two OFDM symbols.

23. The method of claim 22, wherein the second training field comprises a double guard interval followed by a first training symbol and a second training symbol.

24. The method of claim 23, further comprising:

wirelessly receiving via wireless local area network the data unit over a wireless channel;

estimating a quality of the wireless channel based on the second training field;

decoding the at least one data symbol based on the estimated quality of the wireless channel;

performing automatic gain control using the first training field to adjust a first gain of an amplifier of a receiver; and

receiving at least one data symbol using the receiver after the first gain is adjusted,

wherein the data unit comprises a physical layer protocol data unit, the plurality of training fields are periodically repeated in the data unit after a non-zero integer number of data symbols, and the double guard interval has a duration of 16 microseconds.

25. The method of claim 22, wherein the second training field comprises a first guard interval followed by a first training symbol, followed by a second guard interval, followed by a second training symbol.

26. The method of claim 21, further comprising receiving the data unit via one spatial stream, wherein either

the first training field has a duration of one orthogonal frequency-division multiplexing (OFDM) symbol and the second training field has a duration of one OFDM symbol, or

the first training field has the duration of two OFDM symbols and the second training field has the duration of two OFDM symbols.

27. The method of claim 21, wherein

a transmission coding of the data symbols has a spectral efficiency lower than binary phase-shift keying (BPSK) modulation with rate half coding, and

the first training field has a duration of two orthogonal frequency-division multiplexing (OFDM) symbols and the second training field has a duration of four OFDM symbols.

28. The method of claim 27, wherein the second training field comprises a double guard interval followed by a first training symbol and a second training symbol, followed by a first guard interval, followed by a third training symbol, followed by a second guard interval, followed by a fourth training symbol.

29. The method of claim 27, wherein the second training field comprises a first guard interval followed by a first training symbol, followed by a second guard interval, followed by a second training symbol, followed by a third guard interval, followed by a third training symbol, followed by a fourth guard interval, followed by a fourth training symbol.

30. The method of claim 21, further comprising receiving the data unit via a first number of spatial streams,

wherein the plurality of training fields comprise the first training field followed by the first number of second training fields, the first training field having a duration of one orthogonal frequency-division multiplexing (OFDM) symbol, each second training field having a duration of one OFDM symbol, and

each second training field comprises a guard interval followed by a training symbol.

31. A method of wireless communication, comprising:

generating a data unit comprising a plurality of training fields inserted between data symbols, the plurality of training fields comprising a first training field followed by a second training field, the first training field including a gain control sequence, the second training field including a channel estimation sequence; and

wirelessly transmitting via wireless local area network the data unit.

32. The method of claim 31, further comprising transmitting the data unit via one spatial stream, wherein the first training field has a duration of one orthogonal frequency-division multiplexing (OFDM) symbol and the second training field has a duration of two OFDM symbols.

33. The method of claim 32, wherein the second training field comprises a double guard interval followed by a first training symbol and a second training symbol.

34. The method of claim 33, wherein

the data unit comprises a physical layer protocol data unit,

the plurality of training fields are periodically repeated in the data unit after a non-zero integer number of data symbols, and

the double guard interval has a duration of 16 microseconds.

35. The method of claim 32, wherein the second training field comprises a first guard interval followed by a first training symbol, followed by a second guard interval, followed by a second training symbol.

36. The method of claim 31, further comprising transmitting the data unit via one spatial stream, wherein either

the first training field has a duration of one orthogonal frequency-division multiplexing (OFDM) symbol and the second training field has a duration of one OFDM symbol, or

the first training field has the duration of two OFDM symbols and the second training field has the duration of two OFDM symbols.

37. The method of claim 31, wherein

a transmission coding of the data symbols has a spectral efficiency lower than binary phase-shift keying (BPSK) modulation with rate half coding, and

the first training field has a duration of two orthogonal frequency-division multiplexing (OFDM) symbols, and the second training field has a duration of four orthogonal frequency-division multiplexing (OFDM) symbols.

38. The method of claim 37, wherein the second training field comprises a double guard interval followed by a first training symbol and a second training symbol, followed by a first guard interval, followed by a third training symbol, followed by a second guard interval, followed by a fourth training symbol.

39. The method of claim 37, wherein the second training field comprises a first guard interval followed by a first training symbol, followed by a second guard interval, followed by a second training symbol, followed by a third guard interval, followed by a third training symbol, followed by a fourth guard interval, followed by a fourth training symbol.

40. The method of claim 31, further comprising transmitting the data unit via a first number of spatial streams,

wherein the plurality of training fields comprise the first training field followed by the first number of second training fields, the first training field having a duration of one symbol, each second training field having a duration of one symbol, and

each second training field comprises a guard interval followed by a training symbol.

41. An apparatus for wireless communication, comprising:

means for wirelessly receiving via wireless local area network a data unit comprising a plurality of training fields interposed between data symbols, the plurality of training fields comprising a first training field followed by a second training field, the first training field including a gain control sequence, the second training field including a channel estimation sequence; and

means for decoding at least one data symbol based on the plurality of training fields.

42. An apparatus for wireless communication, comprising:

means for generating a data unit comprising a plurality of training fields inserted between data symbols, the plurality of training fields comprising a first training field followed by a second training field, the first training field including a gain control sequence, the second training field including a channel estimation sequence; and

means for wirelessly transmitting via wireless local area network the data unit.

43. A non-transitory computer-readable medium comprising instructions that when executed cause an apparatus to:

wirelessly receive via wireless local area network a data unit comprising a plurality of training fields interposed between data symbols, the plurality of training fields comprising a first training field followed by a second training field, the first training field a including gain control sequence, the second training field including a channel estimation sequence; and

decode at least one data symbol based on the plurality of training fields.

44. A non-transitory computer-readable medium comprising instructions that when executed cause an apparatus to:

generate a data unit comprising a plurality of training fields inserted between data symbols, the plurality of training fields comprising a first training field followed by a second training field, the first training field including a gain control sequence, the second training field including a channel estimation sequence; and

wirelessly transmit via wireless local area network the data unit.