SIMULTANEOUS TRANSMIT AND RECEIVE (STR) STRUCTURES IMMUNE TO PHASE AND AMPLITUDE IMBALANCES

摘要

An echo-canceling unit for a simultaneous transmit and receive (STR) system includes at least three phase shifters in which each respective phase shifter is coupled to a transmit signal to generate an output signal comprising a selected phase shift with respect to the transmit signal. A weight calculation unit generates a corresponding amplitude-weight signal for the output signal of the phase shifter. A variable attenuator attenuates the output signal of each respective phase shifter based on the corresponding amplitude-weight signal to form an echo-cancelation signal component corresponding to the phase shifter. A first summer then sums the respective echo-cancelation signal components into a received signal containing an echo signal to form an echo-canceled signal.

主权项

1. An echo-canceler for a simultaneous transmit and receive (STR) system, comprising:
at least three phase shifters, each respective phase shifter being coupled to a transmit signal of the STR system to generate an output signal comprising a selected phase shift with respect to the transmit signal, the transmit signal comprising a 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) transmit signal; a weight calculation unit coupled to the output signal of each respective phase shifter, each weight calculation unit to generate a corresponding amplitude-weight signal for the output signal of the phase shifter; a variable attenuator to attenuate the output signal of each respective phase shifter based on the corresponding amplitude-weight signal to form an echo-cancelation signal component corresponding to the phase shifter; and a first summer to sum the respective echo-cancelation signal components into a received signal containing an echo signal to form an echo-canceled signal.