System and method for full duplex cancellation

摘要

Disclosed herein are systems, methods, and computer-readable storage media for enabling improved cancellation of self-interference in full-duplex communications, or the transmitting and receiving of communications in a single frequency band without requiring time, frequency, or code divisions. The system estimates the signal strength and phase of a self-interference signal, generates a cancellation signal based on this estimate, then uses the cancellation signal to suppress the self-interference before sampling received analog signal. After applying the cancellation signal, the system samples and digitizes the remaining analog signal. The digitized signal is then subjected to additional digital cancellation, allowing for extraction of the desired signal.

主权项

1. A method comprising:
receiving, at a receiving antenna, a self-interference signal transmitted by a transmitting antenna, the receiving antenna and the transmitting antenna comprising two unique antennas on a single device; estimating a passive suppression of the self-interference signal, wherein the passive suppression of the self-interference signal is based on a previously estimated passive suppression stored in a database; storing the passive suppression of the self-interference signal in the database; generating an analog cancellation signal based on the passive suppression; applying the analog cancellation signal to the self-interference signal, to yield a residual self-interference signal; and applying digital cancellation to the residual self-interference signal.