A Novel Approach for the Estimation of Doubly Spread Acoustic Channels Based on Wavelet Transform
Source abstract
Abstract
In this paper, the estimation of doubly spread underwater acoustic (UWA) channels is investigated. The UWA channels are characterized by severe delay spread and significant Doppler effects, and can be well modeled as a multi-scale multi-lag (MSML) channel. Furthermore, exploiting the sparsity of UWA channels, MSML channel estimation can be transformed into the estimation of parameter sets (amplitude, Doppler scale factor, time delay). Based on this, the orthogonal matching pursuit (OMP) algorithm has been widely used. However, the estimation accuracy of OMP depends on the size of the dictionary, which is related with both delay spread and Doppler spread. Thus it requires high computational complexity. This paper proposes a new method, called wavelet transform (WT) based algorithm, for the UWA channel estimation. Different from OMP algorithm which needs to search in both time domain and Doppler domain, WT-based algorithm only needs to search in time domain by using the Doppler invariant characteristic of hyperbolic frequency modulation (HFM) signal. The performance of the proposed algorithm is evaluated by computer simulations based on BELLHOP. The simulation results show that WT-based algorithm performs slightly better than OMP algorithm in low signal to noise ratio (SNR) while can greatly reduce computational complexity.
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Research context
OpenAlex topics: Underwater Vehicles and Communication Systems · Underwater Acoustics Research · Radar Systems and Signal Processing
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Information Science and Engineering, Southeast University, Nanjing 210096, China
School of Electronic and Information Engineering, Qingdao University, Qingdao 266071, China
School of Automation and Electrical Engineering, Qingdao University, Qingdao 266071, China
Funding
National Basic Research Program of China~(973) · National Natural Science Foundation of China · National High Technology Research and Development Program of China (863) · Fundamental Research Funds for the Central Universities and the Open Research Fund of Key Lab of Broadband Wireless Communications and Sensor Network Technologies (NJUPT), Ministry of Education · Funding of Supporting Excellent Young Professors for Teaching and Research in Southeast~University · Shandong Provincial Natural Science Foundation, China
References (23)
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