摘要
文中研究了中国移动多媒体广播系统(CMMB,China Mobile Multimedia Broadcasting)精确符号同步问题。首先,根据CMMB的时隙结构的特点,采用ML算法进行时隙同步,其次,详细讨论了在CMMB系统中如何通过求取信道冲激响应(CIR,Channel Impulse Response)进行精同步。通过Xilinx FPGA硬件实现的复杂度和存储大小进行分析,对第一径检测的方法进行了改进。最后用Matlab对文中的算法进行性能仿真,可以看出该同步算法在性能上也有提升。
The accurate symbol synchronization for CMMB system is studied.Firstly,according to the characteristics of CMMB time-slot structure,the ML algorithm is adopted to finish slot synchronization;then the fine synchronization of OFDM symbol by using CIR is discussed.Based on analysis of implementation complexity and storage size by Xilinx FPGA hardware,the method for the first-path detection is improved;finally,the simulation with Matlab indicates that the improved synchronization algorithm described in this paper is of a fairly high performance.
出处
《通信技术》
2011年第6期4-5,8,共3页
Communications Technology
