In this paper, we present a novel data-based method for simultaneous Maximum Likelihood (ML) symbol and carrier-frequency o畇et estimation in Orthogonal frequencydivision multiplexing (OFDM) systems. Statistical properties introduced by the cyclic

基于导频脉冲序列，解决IR-UWB通信系统信号捕获和定时同步问题。-Pulse sequence based on the pilot to address the IR-UWB communication system signal acquisition and timing synchronization.