多径信道下ZP-OFDM系统的符号盲同步方法  

Blind Symbol Synchronization Scheme for ZP-OFDM Systems over Multipath Channels

作　　者：刘明骞[1] 李兵兵[1] 孙珺[1] 

机构地区：[1]西安电子科技大学综合业务网理论及关键技术国家重点实验室,西安710071

出　　处：《北京邮电大学学报》2014年第2期58-63,共6页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(61271299);国家高技术研究发展计划项目(2007AA01Z288);高等学校学科创新引智计划项目(B08038)

摘　　要：针对传统的多径信道下零前缀正交频分复用(ZP-OFDM)系统符号盲同步方法的估计精度低的问题,提出一种ZP-OFDM系统的符号盲同步新方法.该方法基于ZP-OFDM符号中零前缀的功率出现规律性的分布特性,利用不等长双窗口能量检测的办法进行符号盲同步.仿真结果表明,在多径信道下,该符号盲同步方法不但具有良好的估计精度而且不受载波频率偏移的影响.The traditional blind symbol synchronization scheme for zero prefix orthogonal frequency division multiplexing （ZP-OFDM） could not acquire accurate symbol synchronization estimation over multipath channels. According to this problem, a new blind symbol synchronization scheme for ZP-OFDM systems was proposed. The proposed scheme is based on zero prefix power collection in the ZP-OFDM symbols whose ZP average power regularly distributes in the two slide windows, and is applied the energy detection method of two unequal length windows to realize the blind symbol synchronization. Simulations show that the proposed symbol synchronization estimation scheme is not only of good estimation precision but also is not influenced by carrier frequency offset over muhipath channels.

关 键 词：零前缀 正交频分复用 符号同步 多径信道 能量检测 

分 类 号：TN911.7[电子电信—通信与信息系统]