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Single channel full duplex wireless communication

  • US 9,288,033 B2
  • Filed: 09/11/2013
  • Issued: 03/15/2016
  • Est. Priority Date: 12/14/2011
  • Status: Active Grant
First Claim
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1. A single channel full duplex wireless communication system, comprising:

  • a processor;

    a transmitter connected to the processor, the transmitter transmitting a transmission signal via a transmission path;

    a receiver connected to the processor, the receiver receiving a received signal via a reception path, wherein the transmitter and the receiver utilize one channel, at the same time, to transmit and receive said transmission and received signals, wherein a portion of the transmission signal is leaked, said leakage causing self-interference in the received signal;

    a secondary transmission path connected to the processor;

    the processor estimating a first transfer function, wherein the input to the first transfer function is adjusted by the first transfer function so as to produce an output to reduce the self-interference in the received signal, and feeding the input of the secondary transmission path with the output from the first transfer function;

    a combiner to combine the received signal with the output from the secondary transmission path, thereby removing at least a fraction of the self-interference; and

    a transmission feedback path, the transmission feedback path output being modified by a second transfer function; and

    a secondary transmission feedback path, the secondary transmission feedback path output being modified by a third transfer function, such that combining of the modified transmission feedback path output and the modified secondary transmission feedback path output with the reception path output reduces a remaining fraction of the self-interference.

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