OFDM系统自适应同步研究与DSP实现  

Research on Adaptive Synchronization of OFDM and DSP Implementation

作　　者：魏国庆 杨凡 程刚 张波 冉明昊 WEI Guo-qing;YANG Fan;CHENG Gang;ZHANG Bo;RAN Ming-hao(Chongqing Jinmei Communication Ltd.,Chongqing 400030,China)

机构地区：[1]重庆金美通信有限责任公司,重庆400030

出　　处：《通信技术》2018年第4期782-785,共4页Communications Technology

摘　　要：为减少无线通信技术中OFDM的同步相关归一化算法的复杂度和系统同步虚警率、误警率,提高系统灵敏度,在Schmidl&Cox同步算法的基础上,提出了一种以场强和信噪比为门限判决的自适应同步改进算法。算法根据接收信号场强和信噪比结果统计,反馈给当前子帧判断信号的相关锋值。仿真结果表明:新算法在原有算法基础上,减小了系统复杂度,降低了虚警率和误警率,且同步信号动态范围提高8 dB,达到了100 dB,同时不增加硬件资源,工程上易于实现。In order to reduce the complexity of synchronization-related normalization algorithms for OFDM in wireless communication technology,the system synchronization false alarm rate,and improve system sensitivity,on the basis of Schmidl&Cox synchronization algorithm,an adaptive synchronization algorithm based on the threshold of field strength and SNR is proposed.Based on the statistics of the received field strength and signal-to-noise ratio of the received signal,the algorithm feeds it back to the current sub-frame to determine the relevant frontal value of the signal.The simulation results indicate that the new algorithm reduces the complexity of the system based on the original algorithm,and reduces the false alarm rate.The dynamic range of the synchronization signal is increased by 8dB and reaches 100dB.At the same time,it does not increase hardware resources and it is easy to implement in engineering.

关 键 词：场强 信噪比 门限判决 自适应同步 动态范围 

分 类 号：TN929.5[电子电信—通信与信息系统]