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Communications device with simultaneous transmit and receive and related methods

  • US 9,461,698 B2
  • Filed: 11/27/2013
  • Issued: 10/04/2016
  • Est. Priority Date: 11/27/2013
  • Status: Active Grant
First Claim
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1. A communications device comprising:

  • a transmit path comprising first and second digital-to-analog converters (DACs) and having at least one non-linear characteristic;

    a receive path operable simultaneously with said transmit path and at a same frequency as said transmit path;

    said receive path comprising first and second analog-to-digital converters (ADCs); and

    processing circuitry configured togenerate a baseband signal for said transmit path,generate a feedforward signal based upon the baseband signal,use the feedforward signal to reduce self-interference in said receive path from said transmit path, andpre-distort the baseband signal based upon the at least one non-linear characteristic;

    said transmit path configured to generate an analog feedforward signal based upon the feedforward signal, and generate a transmit output signal;

    said receive path comprising a combiner configured to combine the analog feedforward signal and an analog receive signal;

    said processing circuitry comprising a sub-band predistorter configured to receive an input signal and generate in-phase (I) and quadrature (Q) signals, and a phase conversion circuit configured to receive the I and Q signals and output at least one intermediate signal, the baseband signal being based upon the at least one intermediate signal.

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