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Low power wireless communication utilizing OFDM backchannels

  • US 9,419,838 B1
  • Filed: 08/14/2015
  • Issued: 08/16/2016
  • Est. Priority Date: 08/14/2015
  • Status: Active Grant
First Claim
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1. A method for encoding a message in a signal transmitted in accordance with an orthogonal frequency-division multiplexing (OFDM), comprising:

  • identifying, by a transmitter, a subset of subcarrier symbols from which to create an OFDM symbol, where the subset of subcarrier symbols is selected from a finite symbol space for orthogonal frequency-division multiplexing and produces a signal that is demodulated by a receiver that does not comply with OFDM;

    receiving, by the transmitter, backchannel data to be transmitted in accordance with OFDM;

    encoding, by the transmitter, the backchannel data using the subset of subcarrier symbols; and

    transmitting, by the transmitter, the encoded backchannel data across a wireless network using orthogonal frequency-division multiplexing.

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