首页|面向海上OFDM通信系统的LS信道估计算法优化

面向海上OFDM通信系统的LS信道估计算法优化

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针对海上无线通信技术"如何提高信道估计的准确性和稳定性"进行研究,就海上OFDM通信系统中传统LS信道估计算法存在频域泄漏和噪声干扰会导致估计精度下降并影响通信质量和可靠性的问题,提出了一种改进的LS信道估计算法.该算法首先在频域将导频处获得的响应进行加窗处理减小频域泄漏的影响,然后利用IDFT在时域进行门限阈值降噪将信号噪声进行分离,DFT回到频域后再利用相邻信道联合估计算法进行优化处理.实验结果表明,与传统的LS信道估计算法相比,改进算法的估计误差更小,且具有更好的稳定性和鲁棒性.
Optimization of LS Channel Estimation Algorithm for Maritime OFDM Communication Systems
Aiming at the research of"how to improve the accuracy and stability of channel estimation"in mari-time wireless communication technology,an improved LS channel estimation algorithm is proposed to solve the problem that the traditional LS channel estimation algorithm in maritime OFDM communication system has the problems of frequency domain leakage and noise interference,which will lead to the degradation of the estimation accuracy and affect the quality and reliability of the communication.The algorithm firstly adds a window in the frequency domain to the response obtained at the pilot frequency to reduce the effect of frequency domain leak-age,and then separates the signal noise by using IDFT to perform threshold noise reduction in the time domain,and then optimizes the process by using the joint estimation algorithm of neighboring channels after the DFT re-turns to the frequency domain.The experimental results show that compared with the traditional LS channel esti-mation algorithm,the improved algorithm has smaller estimation error and better stability and robustness.

maritime communicationorthogonal frequency division multiplexingchannel estimationplus window processingthreshold noise reduction

刘阳、杨蕾、吴志强

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武汉轻工大学电气与电子工程学院,湖北武汉 430023

北京大学武汉人工智能研究院,湖北武汉 430073

海上通信 正交频分复用 信道估计 加窗处理 门限阈值降噪

国家自然科学基金项目水声技术全国重点实验室稳定支持计划资助项目国家重点研发计划项目武汉市知识创新专项项目-曙光计划专项项目东湖高新区国家智能社会治理实验综合基地资助项目

U20A20162JCKYS2023604SSJS0092022YFE01368002023010201020490

2024

10.16112/j.cnki.53-1223/n.2024.05.331

昆明理工大学学报(自然科学版)
昆明理工大学

昆明理工大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.516
ISSN：1007-855X
年,卷(期)：2024.49(5)