摘要
针对传统水声信道估计受噪声影响大和产生频谱泄露等问题,文章提出基于变换域的改进离散傅里叶变换(DFT)算法。该算法首先根据导频信息采用最小二乘法(LS)算法估计出信道响应,再经过DFT变换到时域,在时域中进行加窗、设置门限阈值等操作进一步消除信道响应中的噪声,再结合水声信道模型,并在现场可编程逻辑门阵列(FPGA)平台上实现水声信道的估计,实现算法的硬件加速。经过验证,该算法较传统算法提升了算法抗噪声的性能,并改善了频谱泄露的问题,同时对水声信道的多径干扰以及时频不稳定具有较好的适应性,对水声通信设备集成化具有一定的实用意义。
In order to solve the problems of traditional underwater acoustic channel estimation,such as large impact of noise and spectrum leakage,an improved DFT algorithm based on transform domain is proposed in this paper.Firstly,the LS algorithm is used to estimate the channel response according to the pilot information,and then it is transformed to the time domain by DFT.The noise in the channel response is further eliminated by adding windows and setting threshold in the time domain.Then,combined with the underwater acoustic channel model,the underwater acoustic channel estimation is realized on FPGA platform to realize the hardware acceleration of the algorithm.At the same time,it has good adaptability to the multipath interference and time-frequency instability of underwater acoustic channel,and has certain practical significance for the integration of underwater acoustic communication equipment.
作者
赵慧
王珂
张伟
张秀再
Zhao Hui;Wang Ke;Zhang Wei;Zhang Xiuzai(Information Construction Office,Jiangsu Open University,Nanjing 210036,China;School of Electronics and Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China;Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology,Nanjing University of Information Science&Technology,Nanjing 210044,China)
出处
《信息化研究》
2022年第2期23-31,共9页
INFORMATIZATION RESEARCH
基金
江苏开放大学校级质量工程(QN2021014)
江苏开放大学“十三五”学校发展对策研究课题(19SSWZ-03)。
