新型船舶自动识别系统设计及其同步算法分析

发布时间：2018-05-05 13:28

本文选题：船舶自动识别系统 + 正交频分复用　；参考：《电讯技术》2017年05期

【摘要】：为了提高船舶自动识别系统(AIS)的容量,提出了基于正交频分复用技术(OFDM)的新型AIS系统设计方案。新系统设计主要包括系统参数设计、系统帧结构设计。新系统链路容量和信道传输速率均较传统AIS系统提高了6倍,实现了频域资源的有效利用。该系统对符号定时偏差和载波频率偏差特别敏感,因此对接收信号的同步处理必不可少,在设计的新系统基础之上提出了一种新的盲估计算法,利用包含在循环前缀内的冗余信息,在多径信道信息未知的情况下,直接通过对接收信号做相关构造一个归一化的相关特性函数,通过此函数可得到符号时延位置和多径信道长度,进而得到载波频率偏差。仿真结果表明在多径信道下该算法也具有较好的性能。
[Abstract]:In order to improve the capacity of automatic ship identification system (AIS), a new design scheme of AIS system based on orthogonal Frequency Division Multiplexing (OFDM) is proposed. The new system design mainly includes system parameter design and system frame structure design. The link capacity and channel transmission rate of the new system are 6 times higher than that of the traditional AIS system, and the efficient utilization of the frequency domain resources is realized. The system is especially sensitive to symbol timing offset and carrier frequency offset, so it is necessary to synchronize the received signal. A new blind estimation algorithm is proposed based on the new system. Using redundant information contained in the cyclic prefix, a normalized correlation characteristic function is constructed by correlating the received signal directly under the condition of unknown multipath channel information. Through this function, the position of symbol delay and the length of multipath channel can be obtained, and then the carrier frequency deviation can be obtained. Simulation results show that the algorithm also has good performance in multipath channel.
【作者单位】：天津理工大学计算机与通信工程学院;
【基金】：国家自然科学基金资助项目(61371108,61601326) 天津市高等学校科技发展基金计划项目(20140706,20140707) 天津市应用基础与前沿技术研究计划(青年基金项目)(5JCQNJC01800)
【分类号】：TN929.53;U675.7

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