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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
First Claim
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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.

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