摘要
针对移动环境下OFDM系统的定时同步问题,提出了一种解决算法。该算法基于OFDM系统的Preamble实现,包括定时捕获与定时跟踪两部分。同时,在考虑符号定时误差和样值定时误差的条件下,建立了OFDM系统的数学模型,分析了两种定时误差对系统接收性能的影响。最后阐述了定时同步算法的实施流程,给出了一种同步捕获位置和跟踪位置的判决方法,分析了门限值的设定对算法锁定精度的影响。仿真结果表明,所提出的定时同步算法具有同步精度高和易于实现的特点。
In order to solve the problem of timing synchronization for OFDM system with high mobile speed, an algorithm is presented, which includes timing acquisition and timing tracking 2 parts and realized based on the designed Preamble field. With consideration of the symbol timing offset and sample timing offset, an OFDM system mathematics mode is derived, and the work performance with affecting by two timing offsets is analyzed.Finally the algorithm implementation is analyzed in detail, and a judging idea of which sample corresponds to the synchronization acquisition position and which sample corresponds to the synchronization track position is provided. The locking accuracy caused by adjusting different threshold is discussed, and some simulation is supplied. The simulation results show that, the timing synchronization algorithm presented in the paper has higher synchronization locking accuracy and easy to be implemented.
出处
《物联网技术》
2013年第5期38-42,共5页
Internet of things technologies
