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Cancellation of self-interference is an important issue that should be realized in realizing full-duplex wireless communication. Since a full-duplex wireless communication terminal transmits and receives radio waves at the same time, a signal that receives its own transmitted signal as it is is called self-interference. This is a factor that hinders the decoding of desired signals coming from other stations. Self-interference is a particularly serious issue in full-duplex wireless communication. In order to solve this, various discussions have been held on the method of canceling this self-interference. As a typical example, as shown in the figure, antenna cancellation that increases the isolation between antennas, RF cancellation that cancels at the analog signal stage, and cancellation after passing through the ADC to a digital signal. A method for performing digital cancellation has been proposed. In this case, it is necessary to cancel the self-interference of 110 [dB] in total of the three cancellations, but this is difficult because it is difficult to realize RF cancellation.
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IEEE/ICACT20210238 Slide.04
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