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Self-interference cancellation for two-party relayed communication

  • US 5,596,439 A
  • Filed: 08/01/1995
  • Issued: 01/21/1997
  • Est. Priority Date: 08/01/1995
  • Status: Expired due to Term
First Claim
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1. A method for two-way relayed electromagnetic communication between a first device and a second device through a relay station comprising the steps of:

  • generating at each said first and second device a source signal;

    storing a representation of said source signal as a stored signal at each said device at which said source signal originates;

    estimating channel characteristics of a roundtrip path to said relay station to obtain compensation parameters for each said device;

    transmitting said source signal from each said device to said relay station;

    receiving at each said device a composite signal from said relay station, said composite signal containing a copy of said source signal from each said device;

    modifying said stored signal at each said device using said compensation parameters to obtain a respective cancellation signal for each said device; and

    subtracting at each said device said respective cancellation signal from said composite signal to recover a desired signal, said desired signal being the source signal from the other device.

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