基于GNURadio平台的OFDM同步

In this paper, we study the synchronization for carrier-frequency and symbol-time in orthogonal frequency-division multiplexing (OFDM) systems. Then we present the joint maximum- likelihood (ML) estimator for the carrier-frequency and symbol-time offset to obtain the difference between the transmitter and receiver oscillators and the start of the symbol within the observed block of samples. At last, we write programmes on the platform of GNURadio, the estimator contained in the receiver to improve the performance, and run the programmes in real situations. The result of the programmes confirms that the estimator can estimate the difference between the transmitter and receiver oscillators and symbol-time, which means that the estimator can do impove the performance of the system.