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Systems and methods for asymmetric backscatter communications

  • US 10,452,876 B2
  • Filed: 07/31/2017
  • Issued: 10/22/2019
  • Est. Priority Date: 07/29/2016
  • Status: Active Grant
First Claim
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1. A method for decoding concurrent signals, comprising:

  • transmitting a carrier signal to a plurality of backscatter tags;

    receiving a combined signal comprising respective backscattered signals transmitted by the plurality of backscatter tags, wherein the backscattered signals are transmitted at least partially concurrently by the plurality of backscatter tags, and wherein the plurality of backscatter tags transmit the backscatter signals starting at respective offsets and transmission rates;

    detecting edges in the received combined signal based on a signal vector formed by in-phase (I) and quadrature (Q) signals corresponding to the received combined signal;

    assigning each of the detected edges to streams corresponding to the plurality of backscatter tags, based on one or more of the offsets and transmission rates of the plurality of backscatter tags; and

    decoding the streams of detected edges by assigning one of a plurality of values to each of the detected edges of the streams corresponding to the plurality of backscatter tags, wherein the plurality of values correspond to possible edge states of the detected edges.

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