Apparatus and method for cancelling self-interference signal in RF front end
AssigneesLG Electronics Inc., Industry-Academic Cooperation Dfoundation. Yonsei University
InventorsJinmin Kim, Byung-Wook Min, Donghyun Lee, Jaehoon Chung, Kwangseok Noh
Life of this patent
Estimating the term…
Abstract
The apparatus includes a transmission signal divider for dividing and transmitting a received signal to a transmission antenna and an attenuator, an attenuator for applying a predetermined attenuation factor to the transmitted signal divided to the attenuator, a phase shifter for phase-shifting the signal to which the attenuation factor is applied by a predetermined phase, and a time delayer for time-delaying the phase-shifted signal by a predetermined time.
Claims7
A method for cancelling a self-interference signal at a radio frequency (RF) front end of an apparatus, the method comprising:
- transmitting received signals to a transmission antenna and an attenuator;
- applying a predetermined attenuation factor to a signal input to the attenuator;
- phase-shifting by a predetermined phase the signal to which the attenuation factor is applied;
- time-delaying the phase-shifted signal by a predetermined time;
- transmitting the time-delayed signal to a low noise amplifier (LNA) of a receiving end;
- subtracting the time-delayed signal from a received signal;
- and
- transmitting a residual signal from the subtraction to the LNA,
- wherein the predetermined phase is determined such that a sum of the self-interference signal and the time-delayed signal is equal to or less than a preset value.
An apparatus for cancelling a self-interference signal at a radio frequency (RF) front end, the apparatus comprising:
- a transmitter for transmitting received signals to a transmission antenna and an attenuator;
- the attenuator for applying a predetermined attenuation factor to a signal that is received;
- a phase shifter for phase-shifting by a predetermined phase the signal to which the attenuation factor is applied;
- a time-delayer for time-delaying the phase-shifted signal by predetermined time;
- and
- a subtracter for subtracting the time-delayed signal from a received signal,
- wherein the transmitter is further for transmitting the time-delayed signal to a low noise amplifier (LNA) of a receiving end,
- wherein the transmitter is further for transmitting a residual signal from the subtraction to the LNA, and
- wherein the predetermined phase is determined such that a sum of the self-interference signal and the time-delayed signal is equal to or less than a preset value.
Dependencies are inferred from the claim text.