System and method for high efficiency wireless local area network communications

• US 9,729,368 B2
• Filed: 11/11/2014
• Issued: 08/08/2017
• Est. Priority Date: 11/12/2013
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Suh, Jung Hoon, Zhu, Peiying, Aboul-Magd, Osama, Au, Kwok Shum, Sun, Sheng
• Primary Examiner(s): Vlahos, Sophia
• Application Number:
  US14/538,087
• Publication Number:
  US 20150131756A1
• Time in Patent Office: 1,001 Days
• CPC Class Codes: H04L 27/0012 arrangements for identifying the type of modulation
• CPC Class Codes: H04L 27/26025 Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking allocating sub-channels of the transmission path H04L5/003
• CPC Class Codes: H04L 27/2603 Signal structure ensuring backward compatibility with legacy system
• CPC Class Codes: H04L 27/2604 Multiresolution systems by means of multiresolution subcarriers H04L27/183, H04L27/3488
• CPC Class Codes: H04L 27/2628 Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators H04L27/2634 takes precedence

Abstract

System and method embodiments are provided for high efficiency wireless communications. In an embodiment, a method in a network component for transmitting a frame of two different fast Fourier transform (FFT) sizes includes generating a frame, wherein the frame comprises orthogonal frequency-division multiplexing (OFDM) symbols in two different FFT sizes, wherein the frame comprises a first portion and a second portion, wherein the first portion comprises a first FFT size and the second portion comprises a second FFT size; and transmitting the frame during a single transmission opportunity.

Claims

1. A method in a network component for transmitting a frame of two different fast Fourier transform (FFT) sizes, comprising:

generating a frame, wherein the frame comprises orthogonal frequency-division multiplexing (OFDM) symbols in two different FFT sizes, wherein the frame comprises a preamble portion and a data portion, wherein the preamble portion comprises a first FFT size and the data portion comprises a second FFT size, wherein the first FFT size and the second FFT size are different, and wherein the data portion comprises a high efficiency wireless local area network (HEW) FFT size, wherein at least a portion of the preamble is modulated according to a first modulation scheme and at least a portion of the preamble is modulated according to a second modulation scheme, wherein the first modulation scheme is binary phase-shift keying (BPSK) modulation and the second modulation scheme is quadrature phase shift keying (QPSK) modulation, wherein the QPSK modulation provides auto-detection functionality, and wherein non-HEW devices stop decoding a HEW frame upon encountering the QPSK modulation; and

transmitting the frame during a single transmission opportunity.

2. The method of claim 1, wherein the preamble portion comprises a legacy format.

3. The method of claim 1, wherein the frame comprises a first field and a second field, and wherein the first field provides automatic gain control (AGC) and synchronization and the second field provides synchronization and channel estimation.

4. The method of claim 1, wherein the preamble portion comprises a first field and a second field that provide information enabling a receiver to estimate two stream channels for two stream space-time block code (STBC).

5. The method of claim 1, wherein the preamble portion comprises a frame control field and wherein the frame control field comprises two symbols modulated with the second modulation scheme and causing the non-HEW devices to stop decoding the frame when encountered by an auto-detection mechanism.

6. The method of claim 1, wherein the frame comprises common reference sequences (CRS) for channel estimation.

7. The method of claim 6, wherein a number of symbols in which the CRS is inserted is determined according to a number of physical antennas.

8. The method of claim 1, wherein the frame comprises a data demodulation reference sequences (DMRS).

9. The method of claim 8, wherein a number of symbols in which the DMRS is inserted is determined according to a number of transmission streams.

10. A wirelessly enabled network component, comprising:

a processor; and

a computer readable storage medium storing programming for execution by the processor, the programming including instructions to;

generate a frame, wherein the frame comprises orthogonal frequency-division multiplexing (OFDM) symbols in two different fast Fourier transform (FFT) sizes, wherein the frame comprises a preamble portion and a data portion, wherein the preamble portion comprises a first FFT size and the data portion comprises a second FFT size, wherein the first FFT size and the second FFT size are different, wherein the data portion comprises a high efficiency wireless local area network (HEW) FFT size, wherein at least a portion of the preamble is modulated according to a first modulation scheme and at least a portion of the preamble is modulated according to a second modulation scheme, wherein the first modulation scheme is binary phase-shift keying (BPSK) modulation and the second modulation scheme is quadrature phase shift keying (QPSK) modulation, wherein the QPSK modulation provides auto-detection functionality, and wherein non-HEW devices stop decoding a HEW frame upon encountering the QPSK modulation; and

transmit the frame during a single transmission opportunity.

11. The wirelessly enabled network component of claim 10, wherein the preamble comprises a legacy format.

12. The wirelessly enabled network component of claim 10, wherein the frame comprises a first field and a second field, and wherein the first field provides automatic gain control (AGC) and synchronization and the second field provides synchronization and channel estimation.

13. The wirelessly enabled network component of claim 10, wherein the preamble portion comprises a first field and a second field that provide information enabling a receiver to estimate two stream channels for two stream space-time block code (STBC).

14. The wirelessly enabled network component of claim 10, wherein the preamble portion comprises a frame control field and wherein the frame control field comprises two symbols modulated with the second modulation scheme and causing the non-HEW devices to stop decoding the frame when encountered by an auto-detection mechanism.

15. The wirelessly enabled network component of claim 10, wherein the frame comprises common reference sequences (CRS) for channel estimation.

16. The wirelessly enabled network component of claim 15, wherein a number of symbols in which the CRS is inserted is determined according to a number of physical antennas.

17. The wirelessly enabled network component of claim 10, wherein the frame comprises a data demodulation reference sequences (DMRS).

18. The wirelessly enabled network component of claim 17, wherein a number of symbols in which the DMRS is inserted is determined according to a number of transmission streams.

19. A method in a wireless network device, comprising:

receiving a frame, wherein the frame comprises orthogonal frequency-division multiplexing (OFDM) symbols in two different FFT sizes, wherein the frame comprises a preamble portion and a data portion, wherein the preamble portion comprises a first FFT size and the data portion comprises a second FFT size, wherein the first FFT size and the second FFT size are different, and wherein the data portion comprises a high efficiency wireless local area network (HEW) FFT size, wherein at least a portion of the preamble is modulated according to a first modulation scheme and at least a portion of the preamble is modulated according to a second modulation scheme, wherein the first modulation scheme is binary phase-shift keying (BPSK) modulation and the second modulation scheme is quadrature phase shift keying (QPSK) modulation, wherein the QPSK modulation provides auto-detection functionality, and wherein non-HEW devices stop decoding a HEW frame upon encountering the QPSK modulation;

decoding the first portion according to the first FFT size, wherein the first portion comprises a preamble; and

decoding the second portion according to the second FFT size, wherein the second portion comprises a data portion.

20. A wireless system, comprising:

a transmitter; and

a processor coupled to the transmitter, wherein the processor is configured to generate a frame, wherein the frame comprises orthogonal frequency-division multiplexing (OFDM) symbols in two different fast Fourier transform (FFT) sizes, wherein the frame comprises a preamble portion and a data portion, wherein the preamble portion comprises a first FFT size and the data portion comprises a second FFT size, wherein the first FFT size and the second FFT size are different, and wherein the data portion comprises a high efficiency wireless local area network (HEW) FFT size, wherein at least a portion of the preamble is modulated according to a first modulation scheme and at least a portion of the preamble is modulated according to a second modulation scheme, wherein the first modulation scheme is binary phase-shift keying (BPSK) modulation and the second modulation scheme is quadrature phase shift keying (QPSK) modulation, wherein the QPSK modulation provides auto-detection functionality, wherein non-HEW devices stop decoding a HEW frame upon encountering the QPSK modulation, and wherein the processor is further configured to cause the transmitter to transmit the frame during a single transmission opportunity.

21. The system of claim 20, wherein the preamble comprises a legacy format.

22. The system of claim 20, wherein the frame comprises a first field and a second field, and wherein the first field provides automatic gain control (AGC) and synchronization and the second field provides synchronization and channel estimation.

23. The system of claim 20, wherein the first portion comprises a first field and a second field that provide information enabling a receiver to estimate two stream channels for two stream space-time block code (STBC).

24. The system of claim 20, wherein the preamble portion comprises a frame control field and wherein the frame control field comprises two symbols modulated with the second modulation scheme and causing the non-HEW devices to stop decoding the frame when encountered by an auto-detection mechanism.

25. The system of claim 20, wherein the frame comprises common reference sequences (CRS) for channel estimation.

26. The system of claim 25, wherein a number of symbols in which the CRS is inserted is determined according to a number of physical antennas.

27. The system of claim 20, wherein the frame comprises a data demodulation reference sequences (DMRS).

28. The system of claim 27, wherein a number of symbols in which the DMRS is inserted is determined according to a number of transmission streams.