Performance of Self-Interference Canceller in SDRBased Full-Duplex System

To realize full-duplex mobile system, the key challenge is to eliminate the self-interference (SI) caused by the coupling between the transmitter (TX) and its own receiver (RX). We propose a new type of SI canceller using a specific demodulation reference signal (DMRS) which can estimate the channel response of SI. First, the DMRS mapping shift method which enables SI cancellation is described. Then, the principle of proposed SI canceller using the DMRS mapping shift method. Furthermore, we show the configuration of SDR-based full-duplex system combining analog front end and FPGA introduced the algorithm of the proposed SI canceller. We demonstrate the BERs of OFDM signal whose symbol modulations are up to 1024-QAM under the presence of enormous amount of SI. The experimental results verify that the proposed SI canceller can sufficiently improve the BERs of OFDM signal.