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Method for efficient channel estimation and beamforming in FDD system by exploiting uplink-downlink correspondence

  • US 10,588,126 B2
  • Filed: 11/06/2017
  • Issued: 03/10/2020
  • Est. Priority Date: 06/28/2013
  • Status: Active Grant
First Claim
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1. An apparatus of a wireless device, the apparatus comprising:

  • processing circuitry, the processing circuitry configured to;

    decode a first probing signal from a second wireless device, the first probing signal received via a plurality of communication paths;

    in response to receiving the first probing signal, determine a plurality of signal measurements associated with the plurality of communication paths between the wireless device and the second wireless device, wherein each signal measurement of the plurality of signal measurements is associated with a corresponding one of the plurality of communication paths and is determined based on a spatial signature of the corresponding one of the plurality of paths; and

    encode a plurality of second probing signals for transmission to the second wireless device, each probing signal of the plurality of second probing signals encoded for directional transmission to the second wireless device on the corresponding one of the plurality of communication paths, based on the plurality of signal measurements, and wherein the first probing signal and the plurality of second probing signals are configured as beamforming vectors.

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