摘要
为了消除多普勒频偏影响,通过水上实验对两种OFDM(Orthogonal Frequency-Division Multiplexing)水声通信多普勒估计算法进行对比。基于拷贝相关时延差估计的多普勒估计算法结构简单、易于实现;基于空载波的算法较复杂,但精度较高。利用两种方法对相同的实验数据进行多普勒估计和补偿,并对其通信误码率进行对比。研究结果表明,在慢变的信道中两者的误码率基本相同,但在快变的信道中基于空载波的算法更稳定。
In order to compare the advantage and shortcoming of two Doppler estimation algorithms for OFDM （Orthogonal Frequency-Division Multiplexing） in underwater acoustic communication, a lacustrine experiment was carried out. The replica correlation time delay difference estimation algorithm is simple and easy to achieve, and the null subcarriers algorithm is complex and accurate. The same experimental dates are estimated and compensated based on the two algorithms, and error bit rates are compared. The results show that the two methods have mainly uniform error bit rates in slow-varying UWA （Underwater Acousitic） channels, but the null subcartiers algorithm is more stable in fast time-varying channels.
出处
《吉林大学学报（信息科学版）》
CAS
2012年第4期341-346,共6页
Journal of Jilin University（Information Science Edition）
基金
国家自然科学基金资助项目(60802060)
国家自然科学基金青年基金资助项目(51009041)
水声技术重点实验室基金资助项目(9140C200201090C2004)
中央高校基本科研业务费专项基金资助项目(F030102)
海洋公益性行业科研专项经费基金资助项目(gz2010001)
关键词
水声通信
正交频分复用
多普勒估计
空载波
线性调频信号
underwater acoustic communication orthogonal frequency-division multiplexing （OFDM） Doppler estimation null subcarriers linear frequency modulation（LFM）
