Characteristics analysis of OFDM signal in multipath channel

• 1、Information and Communication Engineering School, Harbin Engineering University, Harbin 150001

Abstract：Orthogonal Frequency Division Multiplexing (OFDM) technology is widely used in modern communication systems due to its efficient spectrum utilization and superior anti-multipath interference capability. With the continuous development of non-cooperative communication technology, finding a simple and efficient OFDM channel signal identification and parameter estimation method has gradually become the focus of research. In this paper, based on the application background of receiving non-cooperative OFDM signal, select the wireless channel ubiquitous multipath channel as the transmission environment. The OFDM system model under multipath channel is firstly be established, and then based on the model, the OFDM signal\'s characteristics include time-domain statistical characteristics, autocorrelation characteristics and cyclostationary characteristics are analyzed and derived, and the existence of the above characteristics in multi-path channel is discussed with the change of parameters. Finally, the above characteristics of OFDM in multipath channel are simulated, which provides a theoretical basis for the research on the identification and parameter estimation of non-cooperative OFDM signals in multipath channel.

Keywords： OFDM multipath channel characteristic analysis