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Channel estimation in OFDMA for switched antenna array based angle-of-arrival location

  • US 10,330,770 B2
  • Filed: 11/09/2017
  • Issued: 06/25/2019
  • Est. Priority Date: 11/09/2017
  • Status: Active Grant
First Claim
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1. A method comprising:

  • detecting at a plurality of antennas of at least one wireless device, energy spanning a frequency bandwidth that may include a transmission from each of one or more source devices, wherein a transmission from a source device occupies a unique set of subcarriers in a sub-band of the frequency bandwidth;

    generating at least one reference receive signal from at least one designated antenna;

    switching among the plurality of antennas, excluding the at least one designated antenna, over time, to generate a plurality of antenna-specific receive signals for a corresponding antenna state, each for a different time interval;

    computing a first channel estimate based on the at least one reference receive signal;

    decoding at least a portion of a frame for one of the transmissions based on the first channel estimate to recover symbol data;

    computing a second channel estimate based on the plurality of antenna-specific receive signals;

    generating a composite channel estimate from at least one of the first channel estimate and the second channel estimate;

    using the composite channel estimate, computing an angle of arrival vector for a transmission from a corresponding source device of the one or more source devices; and

    deriving a location estimate for the corresponding source device of the one or more source devices based at least in part on the angle of arrival vector for the corresponding source device.

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