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Range extension mode for WiFi

  • US 10,153,930 B2
  • Filed: 07/12/2017
  • Issued: 12/11/2018
  • Est. Priority Date: 10/25/2013
  • Status: Active Grant
First Claim
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1. A method for generating a physical layer (PHY) data unit for transmission via a communication channel, the PHY data unit conforming to an extended range mode of a wireless communication protocol, the method comprising:

  • encoding, at a communication device, a plurality of information bits to generate a plurality of encoded bits;

    mapping, at the communication device, the plurality of encoded bits to a plurality of constellation symbols, including mapping each bit to multiple constellation symbols;

    generating, at the communication device, a plurality of orthogonal frequency division multiplexing (OFDM) symbols corresponding to the PHY data unit using the plurality of constellation symbols, wherein the OFDM symbols are generated such that;

    the OFDM symbols have a tone spacing that is ¼

    of a tone spacing of a legacy wireless communication protocol, andthe OFDM symbols span only a subband of a 20 MHz communication channel; and

    generating, at the communication device, a transmission signal using the plurality of OFDM symbols, the transmission signal spanning only the subband of the 20 MHz communication channel.

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