摘要
正交频分复用技术(OFDM)是水声高速通信的研究热点,针对高速实时水声移动通信需求,设计了一种基于前导序列的水声OFDM通信系统,系统数据帧结构包括前导序列和数据帧体两部分,前导序列采用恒包络零自相关(CAZAC)序列,数据帧体采用循环前缀OFDM(CP-OFDM)结构,每个OFDM符号内含梳状导频和空载波。该系统利用前导序列估计多普勒因子,利用空载波估计载波频率偏差(CFO),利用梳状导频进行信道估计。基于Matlab搭建了仿真系统,对多普勒估计与补偿效果和系统误码率进行了仿真研究,仿真结果表明了所设计系统的有效性。
Orthogonal frequency division multiplexing(OFDM) is a research hotspot for high-speed underwater acoustic communication(UWAC). Aiming at the requirements of high-speed and real time underwater acoustic mobile communication, a preamble- based UWA OFDM communication system is designed, and the data frame structure contains preamble sequence and data frame body. The preamble sequence adopts the constant amplitude zero auto correlation(CAZAC) sequence, the data frame body adopts OFDM structure with cyclic prefix(CP-OFDM) and each OFDM symbol contains comb pilots and null subcarriers.This system utilizes preamble sequence to estimate Doppler factor, calculates the carrier frequency offset(CFO) by utilizing null subcarriers, and utilizes comb pilots for channel estimation. Simulation system is built based on Matlab. The effect of Doppler compensation and system bit error rate is simulated, and the simulation result shows the effectiveness of the designed system.
出处
《电脑知识与技术》
2016年第4X期281-284,共4页
Computer Knowledge and Technology
基金
国家自然科学基金(61431005)
高等学校博士学科点专项科研基金(20120132120006)
中央高校基本科研业务费专项资金(201213004)
关键词
水声通信
OFDM
前导序列
多普勒估计
空载波
underwater acoustic communication
OFDM
preamble sequence
Doppler estimation
null subcarrier
