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Methods for recovering RFID data based upon probability using an RFID receiver

  • US 9,613,236 B2
  • Filed: 12/15/2014
  • Issued: 04/04/2017
  • Est. Priority Date: 10/28/2005
  • Status: Expired due to Fees
First Claim
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1. An adaptive noncoherent receiver for recovering RFID data transmitted over a communication channel comprising:

  • a converter configured to receive a phase modulated input signal and convert the received input signal into a vector representation by sampling the received input signal;

    a channel equalizer comprising a filter bank, where the channel equalizer is configured to cancel interference associated with the communication channel by filtering the received input signal utilizing the filter bank and generate a first output signal;

    a phase rotator configured to receive the first output signal and rotate the phase of the first output signal to generate a second output signal;

    wherein the receiver further comprises a non-coherent estimation unit configured to receive the second output signal and generate a soft metric estimation;

    wherein the non-coherent estimation unit is updated based upon feedback from a noncoherent soft-input-soft-out (SISO) decoder;

    wherein the SISO decoder is updated utilizing the soft metric estimation;

    wherein the SISO decoder is iteratively updated; and

    a channel estimation unit configured to estimate a channel impulse response of the communication channel and update the filter bank.

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