基于DVB-T/H系统的模式检测和帧同步算法

针对数字视频广播(DVB-T和DVB-H)系统,提出了一种定长归一化峰值算法实现模式和保护间隔的检测以及帧同步.该算法仅利用循环前缀的特点,不需要其他的辅助数据.仿真表明,该算法检测性能好,可推广应用于其他具有多种模式和保护间隔检测及帧同步的OFDM系统.     

新一代移动多媒体标准DVB-H

DVB—H（手持数字视频广播标准）是DVB（欧洲数字电视广播标准化团体）组织为通过地面数字广播网络向便携／手持终端提供多媒体业务所制订的传输标准，主要介绍和分析DVB—H系统的结构和关键技术。     

基于DAB/DMB系统的模式检测及帧同步技术

针对数字多媒体广播(DAB/DMB)系统,提出了一种可实际应用的信号模式检测和时域帧同步技术,该方法是基于信号空符号的能量自适应检测方法(Energy-Based Detection,EBD).仿真结果显示其同步性能良好,可推广应用于其他具有多种传输模式的OFDM系统的模式检测及帧同步.与最大似然相关方法相比,实现复杂度低,硬件资源占用少.     

A novel frequency synchronization scheme for OFDM systems

A novel frequency synchronization scheme for orthogonal frequency division multiplexing （OFDM） systems is proposed, including a novel frequency offset estimation algorithm and a novel frequency offset compensation algorithm. The frequency offset estimation includes both the fractional frequency offset （FFO） estimation and the integral frequency offset （IFO） estimation. Firstly, the FFO was obtained by the conventional ML algorithm in time domain. After the FFO was compensated in time domain, the IFO was obtained by the pro- posed algorithm based on the energy of virtual carriers. This algorithm needs only simple calculations and has a large frequency offset estimation range. Furthermore, it is insensitive to symbol synchronization errors and channel changing. Finally, the IFO was compensated based on the carrier - positions offset, which can be completed through carrier-positions cyclic shifts in frequency domain. This proposed frequency synchronization scheme can decrease the system redundancy without any need of assistant data, and can be applied to the fast synchroniza- tion with the only need of one OFDM symbol. The analyses and simulations show the improved performance of the proposed frequency synchronization scheme.