Analog Self-Interference Cancellation For Full Duplex Communication Systems

Abstract

Currently, with the development of the communication systems, the demand for high speeds and spectrum is increasing. In order to satisfy this demand, Full-Duplex Communication Systems are being studied. Since the communication is done at the same time and frequency in Full-Duplex Communication systems, it doubles the spectrum efficiency. However, since the communication is done at the same time and frequency, the strong transmit signal leakage the receiver path which is called self interference. This self interference must be cancelled so that communication can continue. According to the study results, approximately 60 dB self interference cancellation achieved at 10 MHz bandwidth and 2.5 GHz. Error Vector Magnitude analysis was carried out in order to examine the effect of this self Interference cancellation on communication systems. According to this analysis, -55 dBm receiving sensitivity performance was measured while transmitting 0 dBm.