Indoor radio ranging based on a subset of subcarriers employed by orthogonal frequency division multiplexing (OFDM)

A mobile device for radio ranging based on orthogonal frequency division multiplexing (OFDM) subcarriers, the mobile device comprising:

• a first transceiver;
• and
• a processor coupled to the first transceiver, the processor configured to:
• receive, at the first transceiver, a received OFDM signal from a second transceiver;
• select a subset of at least two OFDM subcarriers comprising less than a majority of the OFDM subcarriers;
• and
• auto-correlate the subset of at least two OFDM subcarriers of the received OFDM signal to provide an auto-correlation result having a beat frequency from the subset of at least two OFDM subcarriers, wherein the auto-correlation result comprises a plurality of possible ranges.

A mobile device for radio ranging based on orthogonal frequency division multiplexing (OFDM) subcarriers, the mobile device comprising:

• means for receiving, at a first transceiver, a received OFDM signal from a second transceiver;
• means for selecting a subset of at least two OFDM subcarriers comprising less than a majority of the OFDM subcarriers;
• and
• means for auto-correlating the subset of at least two OFDM subcarriers of the received OFDM signal to provide an auto-correlation result having a beat frequency from the subset of at least two OFDM subcarriers, wherein the auto-correlation result comprises a plurality of possible ranges.

A non-volatile computer-readable storage medium including program code stored thereon for radio ranging based on orthogonal frequency division multiplexing (OFDM) subcarriers, the program code comprising code for:

• receiving, at a first transceiver, a received OFDM signal from a second transceiver;
• selecting a subset of at least two OFDM subcarriers comprising less than a majority of the OFDM subcarriers;
• and
• auto-correlating the subset of at least two OFDM subcarriers of the received OFDM signal to provide an auto-correlation result having a beat frequency from the subset of at least two OFDM subcarriers, wherein the auto-correlation result comprises a plurality of possible ranges.

A method for radio ranging based on orthogonal frequency division multiplexing (OFDM) subcarriers, the method comprising:

• receiving, at a first transceiver, a received OFDM signal from a second transceiver;
• selecting a subset of at least three OFDM subcarriers;
• and
• auto-correlating the subset of at least three OFDM subcarriers of the received OFDM signal to provide an auto-correlation result comprising a range.

A mobile device for radio ranging based on orthogonal frequency division multiplexing (OFDM) subcarriers, the mobile device comprising:

• a first transceiver;
• and
• a processor coupled to the first transceiver, the processor configured to:
• receive, at the first transceiver, a received OFDM signal from a second transceiver;
• select a subset of at least three OFDM subcarriers;
• and
• auto-correlate the subset of at least three OFDM subcarriers of the received OFDM signal to provide an auto-correlation result comprising a range.

A mobile device for radio ranging based on orthogonal frequency division multiplexing (OFDM) subcarriers, the mobile device comprising:

• means for receiving, at a first transceiver, a received OFDM signal from a second transceiver;
• means for selecting a subset of at least three OFDM subcarriers;
• and
• means for auto-correlating the subset of at least three OFDM subcarriers of the received OFDM signal to provide an auto-correlation result comprising a range.

A non-volatile computer-readable storage medium including program code stored thereon for radio ranging based on orthogonal frequency division multiplexing (OFDM) subcarriers, the program code comprising code for:

• receiving, at a first transceiver, a received OFDM signal from a second transceiver;
• selecting a subset of at least three OFDM subcarriers;
• and
• auto-correlating the subset of at least three OFDM subcarriers of the received OFDM signal to provide an auto-correlation result comprising a range.