Robust Mode Detection Based on DRM System

Abstract

This paper proposes a mode detection algorithm based on digital radio (DRM) system. DRM system is a digital broadcasting standard including long wave, medium wave and short wave, which is applicable to digital broadcasting below 30dB. By selecting different transmission modes, signals can be effectively transmitted in different channels and under different conditions. DRM system standard defines four different transmission modes (also known as robust mode). The main differences between these modes are the number of subcarriers, subcarrier spacing, pilot and other structures of OFDM symbols. Therefore, on the basis of completing the time synchronization corresponding to the four transmission modes, this paper proposes a mode detection algorithm based on synchronization analysis, which can effectively identify the transmission mode used by the transmission signal when obtaining the transmission signal, so as to better complete the follow-up signal processing work such as synchronization and channel estimation.