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Full-duplex RF link for multi-channel wideband communication

  • US 9,712,233 B1
  • Filed: 09/11/2015
  • Issued: 07/18/2017
  • Est. Priority Date: 09/16/2014
  • Status: Active Grant
First Claim
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1. An RF communication system capable of simultaneous transmitting and receiving over multiple bands comprising:

  • a. at least one transceiver capable of transmitting a wideband RF transmit signal and receiving a wideband RF receive signal;

    b. a photonic interference canceller comprising;

    i. a first electro-optical transmitter configured to modulate the wideband RF transmit signal to an optical transmit signal;

    ii. a second electro-optical transmitter configured to modulate the wideband RF receive signal to an optical receive signal;

    iii. a time delay circuit used to control the propagation time of a first copy of the optical transmit signal relative to the optical receive signal;

    iv. a variable attenuator to control the relative power of the first copy of the optical transmit signal;

    v. a first opto-electrical receiver configured to demodulate a second copy of the optical transmit signal to an RF signal;

    vi. a second opto-electrical receiver configured to generate a filtered RF receive signal from which a transmit signal component has been canceled, wherein the second opto-electrical receiver is a balanced receiver receiving as inputs and demodulating (1) the first copy of the optical transmit signal, and (2) the optical receive signal, and combining the demodulated signals in order to generate the filtered RF receive signal; and

    c. at least one wideband antenna directing the wideband RF receive signal to the transceiver and/or radiating the wideband RF transmit signal.

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