An Iterative Maximum Likelihood Synchronization Method for OFDM System

• 作者: Chi-Min Li Wei-Tse Sun
• 来源期刊: 通讯与网络(英文)
• 学科: 工学
• 关键词: SYNCHRONIZATION MAXIMUM LIKELIHOOD OFDM
• 年，卷（期）: 2013,（2）
• 页码范围: 43-47
• 页数: 5页
• 分类号: TN91

摘要

OFDM system divides a wideband transmission bandwidth into several overlapped narrowband subcarriers to avoid the serious frequency selective fading problem. However, if Timing Offset (TO) and Carrier Frequency Offset (CFO) exist between the Transmitter (Tx) and Receiver (Rx), OFDM system will suffer the Inter-Symbol Interference (ISI) and Inter-Carrier Interference (ICI) that degrade the system performance dramatically. In this paper, we propose an iterative maximum likelihood method for synchronization. We also adopt the overlap concept to reduce the plateau problem. Simulation results show that the proposed method can predict the time delay and frequency offset correctly even under the multipath fading scenarios.