Time Synchronization for Full-Duplex Communications

Abstract: In-band full-duplex has emerged as an attractive solution for significantly enhancing the throughput of wireless communication systems by doubling the spectrum efficiency compared to conventional half-duplex systems. However, the existence of self-interference is a significant barrier to operate full-duplex systems. In order to cancel the self-interference by analog and digital solutions, time synchronization in digital domain is one of the most important elements in full-duplex systems. The aim of this thesis is to present a time synchronization method for orthogonal frequency division multiplexing (OFDM) full-duplex transceiver based on Long Term Evolution (LTE) and validate its performance by MATLAB simulation. The proposed method acquires time offset information of both desired and self-interference signals in a full-duplex node to enhance the successful synchronization probability. To do this, a Zadoff-Chu sequence with a different root index is used for the primary synchronization signal (PSS) at each node. Further, we discuss about the application of different threshold values for the adaptive cross-correlation peak detection of two kinds of PSSs in a full-duplex node.